离心泵泵腔内流动特征的数值分析

Numerical Study of Flow Characteristics in the Impeller Side Chamber of Centrifugal Pump

为了分析离心泵在设计工况运行时叶轮盖板两侧泵腔内流场结构的特点,采用RNGk-ε湍流模型和多重参考系下的雷诺时均N-S方程,对由叶轮通道、蜗室、泵腔和密封环间隙组成的计算域进行定常数值模拟。计算结果与试验结果吻合良好,证明了数值计算方法具有较高的可靠性。流场分析结果表明,泵腔内的流场分布具有非轴对称性,其流场结构比由转子-定子组成的封闭壳体内的流场结构复杂得多,但二者的速度场沿轴向的变化规律相似。

Detailed flow characteristics in the impeller side chamber of a centrifugal pump were studied using CFD method. The computational domain was made up of impeller passages, volute casing, impeller side chamber and seal clearance. Under the hypothesis of steady flow, the RNG k -e turbulence model and RANS equations in multiple reference frames were used to simulate the flow fields. The good agreement of computational and experimental data shows that the CFD method is appropriate for the present study. Computational results reveal that the flow fields are unaxisymmetric in the impeller side chamber, and much more complex than that in an enclosed rotor-stator system. Nevertheless, along axial direction, the velocity profiles are similar with each other both in the impeller side chamber and in the enclosed rotor-stator system.