为了改善离心泵内的汽蚀性能,以ZA150 -315石油化工离心泵为研究对象,在离心叶轮基本外尺寸和设计转速相同的情况下,以3种不同厚度变化规律构造3种离心泵叶轮,运用FLUENT软件进行数值模拟计算,得到了汽蚀发生时泵内部气-液两相分布规律和压力分布规律.分析表明:叶片进口段的形状影响泵的汽蚀性能.叶片进口段形状越接近流线型泵的抗汽蚀性能越好,加大叶片进口段曲率半径可以降低泵的汽蚀余量,改善泵的汽蚀性能.%In order to improve centrifugal pump cavitation performance, ZA150 - 315 petrochemical centrifugal pump were studied. With the basic exterior parameters and rotational speed of centrifugal impeller were fixed, centrifugal impellers were generated with three different changes of thickness, the vapor - liquid two - phase distribution and pressure distribution of centrifugal impeller inner flow were obtained by using computer fluid dynamic method. Analysis of simulated results demonstrate that, the blade inlet geometry have effect on pump cavitation performance. The geometry of the blade inlet closer to streamline, the better to the pump anti - cavitation performance, increasing the radius of curvature of the blade inlet section can reduce the pump cavitation allowance, improving pump cavitation performance.
展开▼
