油田用离心泵汽蚀性能的数值分析与试验

Numerical Analysis and Experiment of Cavitation Performance of Centrifugal Pumps used in Oil Field

为了准确预测油田用离心泵的汽蚀性能,本文使用计算流体力学软件Fluent中的Mixture多相流模型与汽蚀模型相结合对离心泵内的汽蚀现象进行数值模拟,并通过油田用离心泵汽蚀性能试验对数值计算结果进行验证。在验证模拟结果可行的基础上,对离心泵结构及工作参数对其汽蚀性能的影响进行了数值分析,结果表明:叶轮采用6叶片较4和8叶片汽蚀性能更优;叶轮转速越小,离心泵抗汽蚀性能越好;离心泵进口流量越大,抗汽蚀性能越差。

In order to accurately predict cavitation performance of centrifugal pumps used in oil field,three-dimensional simula- tion was performed by using FLUENT software with mixture model and cavitation model. Comparisons between simulated values and measured values of NPSH were made, and the reliability of the numerical simulation was verified. Meanwhile, contrast simula- tions on variations in working parameters were carried out. It is concluded that： （ 1 ） Impellers with 6 blades had better cavitation characteristic than 4 and 8 blades. （2） The lower the impeller＇ s rotational speed was, the better the cavitation performance was. （3） The cavitation performance would be improved by decreasing feed quantity.