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Amiri, Kaveh
Publications (10 of 19) Show all publications
Amiri, K., Mulu, B. G., Raisee, M. & Cervantes, M. (2017). Effects of upstream flow conditions on runner pressure fluctuations. Journal of Applied Fluid Mechanics, 10(4), 1045-1059
Open this publication in new window or tab >>Effects of upstream flow conditions on runner pressure fluctuations
2017 (English)In: Journal of Applied Fluid Mechanics, ISSN 1735-3572, E-ISSN 1735-3645, Vol. 10, no 4, p. 1045-1059Article in journal (Refereed) Published
Abstract [en]

The rotor-stator interaction and the corresponding pressure fluctuations represent one of the sources of pressure and load fluctuations on the rotating parts of rotating machineries. The high-Reynolds flow is subject to rotation in the comparably large vaneless space of axial turbines, causing wake interaction and wake dissipation in this region. This increases the level of flow complexity in this region. This study examined the effect of the flow condition entering the spiral casing on the flow condition within the distributor and the runner and the physical source of pressure fluctuations exerted on the runner of a Kaplan turbine model. Simulations were performed within the water supply system, including the upstream tank, penstock, and the Francis turbines, the level of entering the spiral casing; the results were compared with laser Doppler anemometry (LDA) results. The results were considered as the inlet boundary condition for simulation of the turbine model from the spiral inlet to the draft tube outlet to investigate the flow condition within the distributor and the runner. The CFD simulations showed that the water supply system induces inhomogeneity to the velocity distribution at the spiral inlet. However, the flow condition does not affect the pressure fluctuations exerted on the runner blades due to the rotor-stator interactions. Moreover, the dominant frequencies exerted on the runner blades were accurately approximated although the amplitudes of the fluctuations were underestimated.

Place, publisher, year, edition, pages
Isfahan University of Technology, 2017
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-64739 (URN)10.18869/acadpub.jafm.73.241.27222 (DOI)000403786000004 ()2-s2.0-85020839081 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-07-03 (andbra)

Available from: 2017-07-03 Created: 2017-07-03 Last updated: 2018-07-10Bibliographically approved
Amiri, K., Mulu, B., Cervantes, M. & Raisee, M. (2016). Effects of load variation on a Kaplan turbine runner (ed.). International Journal of Fluid Machinery and Systems, 9(2), 182-193
Open this publication in new window or tab >>Effects of load variation on a Kaplan turbine runner
2016 (English)In: International Journal of Fluid Machinery and Systems, ISSN 1882-9554, E-ISSN 1882-9554, Vol. 9, no 2, p. 182-193Article in journal (Refereed) Published
Abstract [en]

Introduction of intermittent electricity production systems like wind and solar power to electricity market together with the deregulation of electricity markets resulted in numerous start/stops, load variations and off-design operation of water turbines. Hydraulic turbines suffer from the varying loads exerted on their stationary and rotating parts during load variations they are not designed for such operating conditions. Investigations on part load operation of single regulated turbines, i.e., Francis and propeller, proved the formation of a rotating vortex rope (RVR) in the draft tube. The RVR induces pressure pulsations in the axial and rotating direction called plunging and rotating modes, respectively. This results in oscillating forces with two different frequencies on the runner blades, bearings and other rotating parts of the turbine. This study investigates the effect of transient operations on the pressure fluctuations exerted on the runner and mechanism of the RVR formation/mitigation. Draft tube and runner blades of the Porjus U9 model, a Kaplan turbine, were equipped with pressure sensors for this purpose. The model was run in off-cam mode during different load variations. The results showed that the transients between the best efficiency point and the high load occurs in a smooth way. However, during transitions to the part load a RVR forms in the draft tube which induces high level of fluctuations with two frequencies on the runner; plunging and rotating mode. Formation of the RVR during the load rejections coincides with sudden pressure change on the runner while its mitigation occurs in a smooth way.

National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-6114 (URN)10.5293/IJFMS.2016.9.2.182 (DOI)2-s2.0-84989184490 (Scopus ID)4508eea2-7f64-4f96-8605-24d08df390e8 (Local ID)4508eea2-7f64-4f96-8605-24d08df390e8 (Archive number)4508eea2-7f64-4f96-8605-24d08df390e8 (OAI)
Note

Validerad; 2016; Nivå 1; 2016-10-31 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Amiri, K. (2016). Experimental investigation of a Kaplan runner under steady-state and transient operations (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Experimental investigation of a Kaplan runner under steady-state and transient operations
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Hydropower is a key part in electricity production nowadays. Hydropower electricity production rose to 3579.5 TWh in 2013, ranked as the second source of electricity production in the world after fossil fuels. It is the principle source of renewable electricity production, producing 16.2% of the electricity in 2013, accounting for 78% of the renewable electricity production in the world. Specifically in Sweden, hydropower is the main source of electricity production producing 47.5% of the required electricity. Nuclear, biomass, and wind placed in the following positions in the ranking in 2013 with 38.4%, 6.5%, and 4.3%, respectively.Besides meeting electricity demand with an environmental-friendly method, hydropower has a unique and important role which is grid regulation: balancing electricity production and consumption. Gas turbines and hydraulic turbines called “Primary reserves” are the only electricity production systems that can be used for fast regulations due to their short start-up time from 1 to 60 s. The obvious environmental problems, air pollution, and costs associated with gas turbines make hydropower a prime alternative whenever applicable. In Sweden, the share of fossil fuels in electricity production is small; 2.8% in 2012 with an average annual growth of -0.7% in the period 2002-2012. Hence, hydropower is practically the only available source used to regulate the grid fluctuations resulting from deregulated market and fast growth of intermittent power generation systems, i.e., solar and wind energy. Hydraulic turbines are subject to frequent off-design and transient operations because of their grid regulation responsibility. Such operating conditions decrease turbine’s efficiency and affect its lifetime significantly. Off-design and transient operation of hydraulic turbines may induce unpredicted pressure fluctuations on the stationary and rotating parts of the turbine. Special attention should be dedicated to the effects of such phenomena on the runner blades because of their importance on the efficiency of the turbine, and their vulnerability to the pressure fluctuations.This thesis presents an experimental investigation on the effects of off-design and transient operation of an axial hydraulic turbine on velocity fields and pressure fluctuations exerted on the runner and the draft tube of a turbine. The investigation was performed on a 1:3.1 scaled model of a Kaplan turbine known as Porjus U9. The main objective was to investigate the effect of operating point on pressure and velocity fluctuations in the runner and the draft tube. Another objective was to study the effect of transient operation on pressure fluctuations exerted on the runner and the draft tube, to investigate the formation and mitigation process of a rotating vortex rope (RVR) within the draft tube. Finally, the effect of the swirl leaving the runner and the draft tube bend on the performance of the turbine was investigated. The study involves pressure measurements on the runner blades and draft tube walls of the turbine, laser Doppler anemometry (LDA) measurements within and after the runner, and particle image velocimetry (PIV) measurements within the draft tube.The pressure and LDA results acquired during steady state operation of the turbine showed different sources of fluctuations on the runner at different operating points resulting in symmetric and asymmetric fluctuating forces on the runner. The pressure measurements during transient operating conditions exhibited pressure fluctuations exerted on the runner during load variations and elucidated some aspects of formation and mitigation process of RVR within the draft tube. The PIV measurements performed after the draft tube bend of the turbine focuses on the physical phenomena resulting in flow asymmetry after the draft tube bend of hydraulic turbines affecting their efficiency.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2016. p. 85
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-18557 (URN)927fc520-85e9-4e8a-8d4a-51d72ee3424a (Local ID)978-91-7583-652-2 (ISBN)978-91-7583-653-9 (ISBN)927fc520-85e9-4e8a-8d4a-51d72ee3424a (Archive number)927fc520-85e9-4e8a-8d4a-51d72ee3424a (OAI)
Note
Godkänd; 2016; 20160729 (kavami); Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Kaveh Amiri Ämne: Strömningslära/Fluid Mechanics Avhandling: Experimental Investigation of a Kaplan Runner Under Steady-State and Transient Operations Opponent: Bitr. Professor Gabriel Dan Ciocan, Laboratoire de Machines Hydrauliques, Laval University, Quebec, Kanada. Ordförande: Professor Michel Cervantes, Avdelningen för strömningslära och experimentell mekanik, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet, Luleå. Tid: Fredag 9 september, 2016 kl 09.30 Plats: E231, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Amiri, K., Mulu, B. & Cervantes, M. (2016). Experimental Investigation of the Interblade Flow in a Kaplan Runner at Several Operating Points Using Laser Doppler Anemometry (ed.). Paper presented at . Journal of Fluids Engineering - Trancactions of The ASME, 138(2), Article ID 21106.
Open this publication in new window or tab >>Experimental Investigation of the Interblade Flow in a Kaplan Runner at Several Operating Points Using Laser Doppler Anemometry
2016 (English)In: Journal of Fluids Engineering - Trancactions of The ASME, ISSN 0098-2202, E-ISSN 1528-901X, Vol. 138, no 2, article id 21106Article in journal (Refereed) Published
Abstract [en]

This paper presents laser Doppler anemometry (LDA) measurements within the runner blade channels and at the runner outlet of a Kaplan turbine model. The model was investigated at six operating points located on two propeller curves of the turbine to study the flow condition during on-cam and off-cam operations. Main and secondary flows within and after the runner were analyzed, and the effects of the hub and tip clearances on the velocity fields within and after the runner were evaluated. Operation of the turbine at flow rates that are lower than the designed rate for the corresponding propeller curve resulted in vortex breakdown and the formation of a rotating vortex rope (RVR). The RVR formation produced an asymmetrical velocity distribution within and after the runner. The results demonstrated the occurrence of an oscillating flow with the same frequency as the vortex rope within the blade channels located upstream of the RVR. This results in an asymmetric flow through the runner and oscillating forces on the runner blades. The measured velocities indicated that the geometrical asymmetries in the runner manufacturing process resulted in various flow asymmetries at the measured sections. The asymmetries were up to 3% within the runner and 7% at the runner outlet

National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-10849 (URN)10.1115/1.4031609 (DOI)000367237300006 ()2-s2.0-84945946361 (Scopus ID)9ba3dfc3-65fa-4613-a848-110fbf036867 (Local ID)9ba3dfc3-65fa-4613-a848-110fbf036867 (Archive number)9ba3dfc3-65fa-4613-a848-110fbf036867 (OAI)
Note
Validerad; 2015; Nivå 2; 20151113 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Amiri, K., Mulu, B., Raisee, M. & Cervantes, M. (2016). Experimental study on flow asymmetry after the draft tube bend of a Kaplan turbine (ed.). Paper presented at . Advances and Applications in Fluid Mechanics, 19(2), 441-472
Open this publication in new window or tab >>Experimental study on flow asymmetry after the draft tube bend of a Kaplan turbine
2016 (English)In: Advances and Applications in Fluid Mechanics, ISSN 0973-4686, Vol. 19, no 2, p. 441-472Article in journal (Refereed) Published
Abstract [en]

Flow condition in a Kaplan turbine draft tube is investigated using laser Doppler anemometry (LDA) and particle image velocimetry(PIV). The investigated draft tube is composed of a cone followed by an elbow and a straight diffuser. The three velocity components were measured after the elbow at two different locations across the straight diffuser to quantify the flow asymmetry as well as the secondary flows formed in this region. The velocity profiles at the draft tube inlet are measured using a 2D LDA system allowing estimation of the draft tube inlet swirl. The results are presented at three operating points of the turbine. The flow condition after the draft tube bend was shown to be highly dependent on the vortex structures within the straight draft tube; namely Dean vortices and the swirl leaving the runner. At operating points with high flow rates and low swirl, Dean vortices dominate the upstream swirl; a symmetric but inhomogeneous flow resembling flow after a pipe bend forms within the straight diffuser. At part load operating points with high swirl and low flow rate, the flow after the bend is dominated by the upstream swirl resulting in asymmetric flow after the draft tube bend. The flow asymmetry is shown to be a 2nd order function of the swirl-to-Dean ratio.

National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-2569 (URN)10.17654/FM019020441 (DOI)2-s2.0-84962361497 (Scopus ID)030d4f61-5f1e-4b85-8c97-ec689d62cc5f (Local ID)030d4f61-5f1e-4b85-8c97-ec689d62cc5f (Archive number)030d4f61-5f1e-4b85-8c97-ec689d62cc5f (OAI)
Note
Validerad; 2016; Nivå 1; 20160331 (kavami)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Amiri, K., Mulu, B., Raisee, M. & Cervantes, M. (2016). Unsteady pressure measurements on the runner of a Kaplan turbine during load acceptance and load rejection (ed.). Paper presented at . Journal of Hydraulic Research, 54(1), 56-73
Open this publication in new window or tab >>Unsteady pressure measurements on the runner of a Kaplan turbine during load acceptance and load rejection
2016 (English)In: Journal of Hydraulic Research, ISSN 0022-1686, E-ISSN 1814-2079, Vol. 54, no 1, p. 56-73Article in journal (Refereed) Published
Abstract [en]

The paper addresses unsteady pressure measurements on the blades and stationary parts of a Kaplan turbine model (Porjus U9) during load variation. The turbine was studied in various load acceptance and load rejection scenarios in off-cam mode to investigate the effect of the transients on the turbine performance. The formation and mitigation processes for the rotating vortex ropes and their effects on the forces exerted on the runner were also investigated. The results show a smooth transition during load variations between high load and the best efficiency point, at which no rotating vortex ropes form in the draft tube. However, load variation to part load resulted in a draft tube surge and the formation of a rotating vortex rope with two fluctuating components: rotating and plunging. The rotating vortex ropes began to form at the end of the draft tube cone during the closure of the guide vanes and travelled upstream with further guide vane closure. The plunging mode induced flow oscillation throughout the entire turbine conduit, whereas the rotating mode resulted in local pressure fluctuations. The rotating vortex ropes induced wide-band pressure fluctuations on the suction side of the runner close to the hub section. The formation of the rotating vortex ropes near the runner resulted in a sudden change in the pressure exerted on the suction side of the blades, whereas the rotating vortex rope mitigation process proceeded in a smooth manner.

National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-3273 (URN)10.1080/00221686.2015.1110626 (DOI)000370980100004 ()2-s2.0-84957426581 (Scopus ID)114f2928-5842-4da9-a472-410db7b2f83d (Local ID)114f2928-5842-4da9-a472-410db7b2f83d (Archive number)114f2928-5842-4da9-a472-410db7b2f83d (OAI)
Note
Validerad; 2016; Nivå 2; 20151201 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Amiri, K., Cervantes, M. & Mulu, B. (2015). Experimental investigation of the hydraulic loads on the runner of a Kaplan turbine model and the corresponding prototype (ed.). Paper presented at . Journal of Hydraulic Research, 53(4), 452-465
Open this publication in new window or tab >>Experimental investigation of the hydraulic loads on the runner of a Kaplan turbine model and the corresponding prototype
2015 (English)In: Journal of Hydraulic Research, ISSN 0022-1686, E-ISSN 1814-2079, Vol. 53, no 4, p. 452-465Article in journal (Refereed) Published
Abstract [en]

This paper reports on unsteady pressure measurements on the runner blades of a Kaplan turbine model as well as torque and radial load bearing measurements on the corresponding prototype at several operating points to investigate the sources of periodic loads exerted on the runner when operating at the best efficiency point and off design. Pressure measurements on the model runner blades indicated that the spiral casing delivers a poorly conditioned flow to the guide vanes close to the lip-entrance junction, resulting in flow separation on the guide vanes. The asymmetric flow delivered to the runner induces large oscillations with respect to the guide vane passing frequency, runner frequency and its harmonics to the runner blades. The torque measurements on the prototype also revealed an asymmetric flow at the distributor outlet. The bearing radial load measurements performed on the prototype support the torque measurement results. The asymmetric hydraulic loads on the runner result in shaft wobbling, and the oscillatory forces exerted on the blades are transferred to the main shaft and bearings. Another source of oscillating forces exerted on the runner blades is the rotating vortex rope (RVR) formation that occurs at part-load operation of the turbine and induces pressure fluctuations at two sub-synchronous frequencies to the runner.Keywords: Bearing load; blade pressure measurement; flow-induced vibration; Kaplan turbine; prototype measurement; spiral casingperformance

National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-11729 (URN)10.1080/00221686.2015.1040085 (DOI)000362881700004 ()2-s2.0-84945474369 (Scopus ID)abbcdca7-14c9-474e-b4b9-58d90c6f5c3c (Local ID)abbcdca7-14c9-474e-b4b9-58d90c6f5c3c (Archive number)abbcdca7-14c9-474e-b4b9-58d90c6f5c3c (OAI)
Note
Validerad; 2015; Nivå 2; 20150604 (kavami)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Bergan, C., Amiri, K., Cervantes, M. J. & Dahlhaug, O. G. (2015). Preliminary measurements of the radial velocity in the Francis-99 draft tube cone (ed.). Paper presented at Francis-99 Workshop : Steady Operation of Francis Turbines 15/12/2014 - 16/12/2014. Journal of Physics, Conference Series, 579(1), Article ID 12014.
Open this publication in new window or tab >>Preliminary measurements of the radial velocity in the Francis-99 draft tube cone
2015 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 579, no 1, article id 12014Article in journal (Refereed) Published
Abstract [en]

Two-dimensional particle image velocimetry (PIV) measurements in the draft tube cone of the Francis-99 model have been performed to complete the actual experimental data set with radial velocity data. The velocity profiles obtained presented some variation, which reason has not yet been identified. The presented results are therefore presented as preliminary until the reason is assessed. The axial velocity profiles corroborate well with the ones previously measured with laser Doppler velocimetry (LDV) for all operating points investigated. The radial velocity measured is small in magnitude for all operating points compared to the axial velocity. A gyroscopic effect induced by the swirl leaving the runner and the draft tube bend seems to induce an asymmetry in the draft tube cone.

National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-34049 (URN)10.1088/1742-6596/579/1/012014 (DOI)000352267200014 ()2-s2.0-84920711926 (Scopus ID)826cfab1-79ce-4a73-a804-6fdeecce14b4 (Local ID)826cfab1-79ce-4a73-a804-6fdeecce14b4 (Archive number)826cfab1-79ce-4a73-a804-6fdeecce14b4 (OAI)
Conference
Francis-99 Workshop : Steady Operation of Francis Turbines 15/12/2014 - 16/12/2014
Note

Validerad; 2015; Nivå 1; 20150120 (andbra); Konferensartikel i tidskrift

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2019-08-20Bibliographically approved
Dehkharqani, A. S., Amiri, K. & Cervantes, M. (2015). Steady and transient pressure measurements on the runner blades of a Kaplan turbine model (ed.). Paper presented at IAHR meeting of the Working Group “Cavitation and dynamic problems" : 09/09/2015 - 11/09/2015. Paper presented at IAHR meeting of the Working Group “Cavitation and dynamic problems" : 09/09/2015 - 11/09/2015.
Open this publication in new window or tab >>Steady and transient pressure measurements on the runner blades of a Kaplan turbine model
2015 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

The development of renewable energy sources has increased the need for power regulation. Power system regulation is mainly performed by hydropower plants through load variations. Additional forces are exerted on the runner blades during these load variations. This paper deals with pressure measurement performed on the blades of a Kaplan turbine model under steady state and load variation conditions. Flow behavior and frequency content of the pressure are investigated and compared to find critical condition in terms of pressure fluctuation. The results show that at various operating points and conditions, different regions of the blade are important. During load rejection, a considerable amount of pressure fluctuations are exerted on the runner blades. These results will be used to define experiments to be performed on the corresponding prototype. On the prototype, the loads acting on the runner blades will be investigated at various operation points similar to the model. In addition, the relation between the frequency content on the blades and loads on the main shaft will be investigated. Comparing results from model and prototype eventually would be valuable to explore the flow characteristics in prototype since CFD simulation of prototype is challenging.

National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-26989 (URN)0483c990-33a4-4860-b187-6204b09379e3 (Local ID)0483c990-33a4-4860-b187-6204b09379e3 (Archive number)0483c990-33a4-4860-b187-6204b09379e3 (OAI)
Conference
IAHR meeting of the Working Group “Cavitation and dynamic problems" : 09/09/2015 - 11/09/2015
Note
Godkänd; 2015; 20150918 (arasol)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-29Bibliographically approved
Amiri, K. (2014). An experimental investigation of flow in a Kaplan runner: steady-state and transient (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>An experimental investigation of flow in a Kaplan runner: steady-state and transient
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Water turbines are since some years widely used for grid stabilization purposes according to their exceptional load variation capability which gives them the ability to compensate grid fluctuations initiated by the customer’s consumption or intermittent electricity production systems such as wind and solar power. Different renewable power generation technologies can be combined in mini-grids to electrify isolated villages and extend existing grid networks. In these occasions, small hydro units are also a good option to reduce the overall variability of supply to low levels and provide low‑cost, local electrification solutions. Hence, initially designed hydropower turbines for steady operation at on-design operating condition experience many off-design, start/stop and load variations during their life time according to the nowadays on-demand energy market and introduction of intermittent power generation systems to the electricity market.Start/stop and load variations can be harsh for the turbines due to the time dependent forces exerted on different parts of the turbines, especially rotating parts. Off-design performance of hydropower systems may also result in unfavorable and harmful periodic forces on the rotating parts. Therefore, investigations are required to study these working conditions and consider them in design of new hydropower plants and refurbished turbines. This was the motivation for the experimental investigation of a Kaplan turbine during on-design, off-design and transient operations with focus on the turbine’s rotor. The test case was a 1:3.1 scaled model of Porjus U9; a Kaplan turbine. The first paper deals with pressure measurements on the runner blades of the model under steady state operating conditions to find and quantify the sources of pressure fluctuations exerted on the runner at different operating points. The goal was to investigate the turbine’s performance at the best efficiency point with concentration on the performance of the water supply system and compare it to operations at high load and part load for a constant blades angle. The model results are compared with prototype measurements to corroborate the findings. The second paper presents the model investigations during load acceptance and load rejection. The model was investigated with pressure measurement on the stationary and rotating parts of the turbine under different load variations between part load, high load and best efficiency point. The third paper focuses on velocity measurements in the runner blade channels and at the runner outlet under on-design and off-design operating conditions. The velocity measurements are performed with a laser Doppler anemometry (LDA) system. The results of the model investigations along two propeller curves are presented to investigate the runner blade angle effects on the turbine’s performance.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2014. p. 108
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-18104 (URN)6dd9f428-899a-4ba3-9acf-a2f2dd0ad16b (Local ID)978-91-7439-848-9 (ISBN)978-91-7439-849-6 (ISBN)6dd9f428-899a-4ba3-9acf-a2f2dd0ad16b (Archive number)6dd9f428-899a-4ba3-9acf-a2f2dd0ad16b (OAI)
Note
Godkänd; 2014; 20140120 (kavami); Tillkännagivande licentiatseminarium 2014-01-27 Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Kaveh Amiri Ämne: Strömningslära/Fluid Mechanics Uppsats: An Experimental Investigation of Flow in a Kaplan Runner: Steady-State and Transient Examinator: Professor Michel Cervantes, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Diskutant: Dr. Advisor Hydropower Production Bjarne Børresen, Energi Norge AS Tid: Fredag den 21 februari 2014 kl 09.30 Plats: E246, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
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