Four energy recovery hydraulic turbine models were designed according to different combinations of guide vane inlet and outlet angles based on an existing single-stage centrifugal volute pump, and the fluid flows in them were simulated numerically by using software Fluent 6.3. It was shown that at the same flow rate all the turbine efficiency and head were declined markedly with increasing inlet angle; at the best efficiency point(BEP), however, the hydraulic efficiency of model A was 7% hi-gher than that of model D. For the same inlet angle, once the outlet angle was greater than the inlet angle, the circulation at the guide vane outlet was decreased and the efficiency of turbine was reduced; otherwise, the efficiency was raised. With increasing inlet and outlet angles, BEP was moved to a higher flow rate, and the pressure distribution in the impeller was distributed more non-uniformly. Therefore, the inlet angle plays a crucial role in determining turbine performance and a guide vane with an inlet angle larger than the outlet angle is beneficial to turbine efficiency. Especially, for a turbine in which the basic geometrical parameters of all the hydraulic components except the guide vane were fixed, there is an optimum combination between inlet and outlet angles of the guide vane. This result can provide some theoretical basis for further study on energy recovery hydraulic turbines.
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