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Numerical analysis of a Kaplan turbine model during transient operation
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik. University Politehnica of Bucharest, Romania.
University Politehnica of Bucharest, Romania.
University Politehnica of Bucharest, Romania.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.ORCID-id: 0000-0001-7599-0895
2019 (engelsk)Inngår i: IOP Conference Series: Earth and Environmental Science, Institute of Physics (IOP), 2019, Vol. 240, artikkel-id 022046Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Hydropower plants are currently being intensively employed for electrical grid regulation. As a consequence, the frequency of start/stops and load variations is considerably increasing, leading to the operation of hydraulic turbines under improper conditions. During the last years, studies have focused on Francis turbines. The present paper aims to investigate a Kaplan turbine model. The flow through the turbine is modelled during transient operation, from the best efficiency point to a part load operating point, using a moving mesh for the guide vane displacement. The simulations are validated against experimental velocity profiles. A time step sensitivity analysis is performed in order to determine the optimum discretization time. The possibility of using large time steps is explored. The numerically simulated unsteady pressure pulsations on the runner blades are analysed. The influence of the inlet boundary conditions on the accuracy of numerical simulations is studied. The results show that a linear flow rate variation defined during the guide vane closure leads to an overestimation of the turbine head compared to the experimental value due to an overestimation of losses. The second type of boundary conditions, a constant total pressure, results in an underestimation of the flow rate compared to the experimental value due again to an overestimation of the losses.

sted, utgiver, år, opplag, sider
Institute of Physics (IOP), 2019. Vol. 240, artikkel-id 022046
HSV kategori
Forskningsprogram
Strömningslära
Identifikatorer
URN: urn:nbn:se:ltu:diva-73589DOI: 10.1088/1755-1315/240/2/022046Scopus ID: 2-s2.0-85063861550OAI: oai:DiVA.org:ltu-73589DiVA, id: diva2:1304078
Konferanse
29th IAHR Symposium on Hydraulic Machinery and Systems 17–21 September 2018, Kyoto, Japan
Tilgjengelig fra: 2019-04-11 Laget: 2019-04-11 Sist oppdatert: 2019-05-03bibliografisk kontrollert

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