Research on the Performance of Same Diameter Forward and Reverse Guide Vanes in Multistage Hydraulic Turbines.

In view of the fact that the multi-stage pump type intermediate guide vane designed according to the pump working condition cannot meet the runner's requirements for flow circulation when used in hydraulic turbine devices, the influence of key structural parameters of pump type equal diameter positive and negative guide vanes on water head loss, efficiency and working head of hydraulic turbine devices is studied by combining the hydraulic turbine design theory and CFD numerical simulation. The results show that appropriately increasing the diameter of the inlet edge of the reverse guide vane, chamfering the edge of the baffle, and chamfering the inner and outer walls of the interstage guide vane inlet can reduce the head loss of the inter-stage guide vane and improve the working efficiency of the hydraulic turbine; the shape and number of guide vanes have a significant impact on their outlet water flow velocity circulation; increasing the wrap angle or increasing the number of blades can enhance the forcing effect of the guide vanes on water flow, increase the outlet water circulation, but increase the head loss of the guide vanes. This paper can provide a reference for the design of the same diameter forward and backward guide vanes used in hydraulic turbines. [ABSTRACT FROM AUTHOR]