Effect of Radial Height of Guide Vanes on Hydraulic Performance of Mixed-flow Pump
To investigate the effect of the guide vane radial height on the hydraulic performance of a mixed-flow pump,the guide vane was truncated to a certain extent along the radial direction at the outlet,and several modified pumps with different radial heights of the guide vane were designed.For the modi-fied pump and the prototype pump without truncation,the internal flow in the pumps was numerically simulated based on NUMECA software platform under full operating conditions,and the hydraulic per-formance of the pumps under the design and off-design conditions was obtained.Through analyzing the internal flow field and static pressure distribution,the impact of the guide vane radial height on the flow characteristics in the pumps was revealed.The results show that compared to the prototype pump and oth-er modified pumps,when the radial height of the guide vane is truncated to 90%of its original height,the matching between the guide vane and the pressure chamber volute is effectively improved.The total flow loss between the guide vane and the volute of the modified pump is reduced by 2.85 percentage points compared to the prototype pump under the design flow rate condition.At an operating condition of 1.2 times the design flow rate,the head of the modified pump is 11.15 meters higher than that of the prototype,with an efficiency increasing of 3.46%.Over the entire operating range,while the prototype pump has a minimum efficiency of about 75%and a maximum efficiency around 89%,the modified pump demonstrates a wider high-efficiency working range with a minimum efficiency of approximately 81.6%and a maximum efficiency of about 89.4%.Thus,the modified pump exhibits superior hydraulic performance with a broader efficient operation envelope.
mixed-flow pumphydraulic performanceguide vane radial heightnumerical simulationflow loss