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基于N-S方程应用标准的k-ε湍流模型对高速开式离心泵进行三维湍流数值模拟,得到了流道内的压力场、速度场的变化规律,揭示了回流等流动现象,验证了液流冲击、流动不均匀和回流是开式叶轮效率低的主要原因;通过对蜗壳进口速度和压力沿周向分布的分析看出分布呈现明显的波动特征,验证了叶轮与蜗壳的干扰所造成的周向流动的不均匀性是非常强烈的。预测出其性能曲线,计算与试验结果吻合良好,证明该计算方法具有较高的可靠性。
Based on the NS equations, a standard k-ε turbulence model was used to simulate the high-speed open centrifugal pump with three-dimensional turbulence. The variation of pressure field and velocity field in the flow channel was obtained. The flow phenomena such as back flow were revealed, Flow unevenness and backflow are the main reasons for the low efficiency of open impellers. Through the analysis of the circumferential distribution of the inlet velocity and pressure of the volute, the distribution shows obvious fluctuation characteristics, which verifies that the interference caused by impeller and volute Inhomogeneity to flow is very strong. The performance curve is predicted. The calculated results are in good agreement with the experimental results, which proves that the calculation method has high reliability.