Abstract： A test rig for single stage hydraulic turbine was designed to obtain extra performance curves through experiment. Numerical simulation of the designed hydraulic turbine was performed by all domains and structural mesh technique. The pressure field and velocity field at different flow rate were discussed to acquire flow field distribution within hydraulic turbine. The variation of velocity field within turbine impeller and outlet pipe at different flow rate was analyzed according to velocity triangle. The results show that a centrifugal pump can run reversely as high efficiency turbine without any modification. The relative error at the best efficiency between numerical calculation and experimental results is 4.85%. The absolute pressure within hydraulic turbine decreases gradually along the volute, impeller and outlet pipe,while the pressure difference between inlet and outlet increases with the increase of flow rate. Vortex regions are located at impeller blade suction and pressure side with location and region size varied by flow rate. The absolute tangential velocity at outlet pipe section is varied with flow.
2012, Vol. 33 
