Study and application of thermodynamic efficiency measurement on large-scale turbine

Abstract

Focused on the influence of the energy distribution in thermodynamic efficiency test on turbine, the basic principle of thermodynamic method is firstly introduced in this paper. Hydraulic efficiency of turbine is worked out based on the first law of thermodynamics accordingly. Numerical calculation is performed on a large-scale prototype turbine then site measurement is carried out. Study result show that energy distribution at high-pressure section is circularly symmetrical and sampling measurement may obtain reliable result. Energy distribution at low-pressure section is rather asymmetrical and is affected obviously by the operation condition. As more as possible measuring points are needed at low-pressure section to obtain the average energy. The heat exchange of the sampling device during thermodynamic measurement need specific measures to get a correct specified mechanical energy of turbine.

Keywords

hydropower station / prototype turbine / turbine discharge / thermodynamic method / energy distribution