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为了改善立式多级筒袋泵的空化性能,研究其内部的空化流动规律,采用基于质量输运方程的混合流空化模型和标准k-ε模型,运用大型通用计算程序ANSYS CFX,计算了立式多级筒袋泵内的三维湍流空化流动的临界空化数,并与实验进行对比。基于数值计算的结果,分析了较小流量及较大流量运行工况下该泵的空化流场。研究表明:采用诱导轮改善了泵的空化性能;从小流量至大流量,泵内的严重空化区域由诱导轮转移至首级叶轮。本文采用的空化流动模拟方法可较好地预测立式多级筒袋泵在设计流量附近的平均空化性能。
In order to improve the cavitation performance of the vertical multistage bag pump, the internal cavitation flow law was studied. The hybrid flow cavitation model and the standard k-ε model based on the mass transport equation were used. By using the generalized calculation program ANSYS CFX, The critical cavitation numbers of three-dimensional turbulent cavitation flow in a vertical multi-stage bag pump were calculated and compared with the experiment. Based on the numerical results, the cavitation flow field of the pump under the condition of smaller flow rate and larger flow rate operation condition is analyzed. The research shows that the induction wheel improves the cavitation performance of the pump. From the small flow rate to the large flow rate, the serious cavitation area in the pump is transferred from the inducer to the primary impeller. The cavitation flow simulation method adopted in this paper can predict the average cavitation performance of vertical multistage bag pump in the vicinity of the design flow rate.