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Extension of Gibson's method for flow measurments: design of an experimental rig
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis presents a study of the flow measuring technique called Gibsons method used in hydro powerplants and the design of an experimental equipment to test it. The work has been done at the Division of Fluid Mechanics, Luleå University of Technology. Flow measurements is crucial for efficiency estimation of hydropower plants. Several methods with good accuracy are today available. However, they are generally expensive and/or need major interventions on the turbine. The Gibson method has the advantage to be generally economical and requires minor interventions on the turbine. It consists of measuring the overpressure in the penstock during the closing of the guide vanes, which is related to the flow rate. The method is included in international standards. The project focuses on the investigation and development of the method outside the limits prescribed by this standard. By using the energy equation an experimental rig is designed. Gauges are attached to the rig to measure the valve position, the flow rate and the pressure. A special attention is given to the pressure measurements, a central part of Gibsons method. The rig is calibrated and tested for further use. Preliminary measurements indicate the capability of the method to determine the flow rate outside of the IEC 41 standard.

Place, publisher, year, edition, pages
Keyword [en]
Technology, pressure measurements, Gibson's method, pressure time, experimental rig
Keyword [sv]
URN: urn:nbn:se:ltu:diva-43579ISRN: LTU-EX--03/165--SELocal ID: 171784ab-e33b-472b-98ac-79237b55878dOAI: diva2:1016812
Subject / course
Student thesis, at least 30 credits
Educational program
Engineering Physics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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