叶片缝隙引流对高速诱导轮性能的影响

为了研究叶片缝隙引流对高速诱导轮性能的影响,以1台带前置诱导轮的高速离心泵为研究对象,就诱导轮叶片设置5种不同缝隙下高速离心泵内部流场进行数值模拟,研究诱导轮叶片缝隙引流对其自身及高速离心泵性能的影响.对比分析了开缝后诱导轮截面内速度分布、诱导轮外特性曲线、高速离心泵空化特性曲线、诱导轮流道内空泡分布以及诱导轮沿轴向位置各截面静压分布规律.结果表明,叶片表面设置缝隙可减弱诱导轮叶顶间隙泄漏流对管道壁面的冲击,削弱叶片进口边吸力面附近的旋涡,改善该区域的流态;缝隙可改变诱导轮流道内压力的分布,从而影响诱导轮流道内的空泡的分布,且合理设计缝隙的大小可使高速离心泵的空化性能得到改善.

Effect of blade gap drainage on the performance of high-speed inducer

To study the effect of blade gap drainage on the performance of high-speed inducer, a high-speed centrifugal pump with a front inducer was selected, and the internal flow field of the high-speed centrifugal pump with five different gaps in the inducer blades was numerically simulated, and the effect of the inducer blades drainage on itself and the cavitation performance on high-speed centrifugal pump was studied. After slitting, the velocity distribution in the section of the inducer, the characteristic curve outside the inducer, the cavitation characteristic curve of the high-speed centrifugal pump, the cavitation distribution in the inducer flow channel, and the static pressure distribution law of each section of the inducer along the axial position were compared and analyzed.The results show that setting gaps on the blade surface can weaken the impact of the leakage flow of the inducer tip clearance on the pipe wall, weaken the vortex near the suction surface of the blade inlet, and improve the flow pattern in this area. The gap can change the distribution of the pressure in the inducer passage, thereby affec-ting the distribution of the bubbles in the inducer passage, and a reasonable design of the size of the gap can improve the cavitation performance of the high-speed centrifugal pump.