引起高速离心泵振动的原因很多，其中一种是由于流体作用力导致叶轮发生偏心转动，即“涡动”引起的高速离心泵的振动。为了探讨涡动情况下高速离心泵内部流场特性，以高速离心泵为研究对象，给定了三种流量、四种偏心距以及六种涡动频率比组成的不同方案，应用CFX软件对高速离心泵的内部流动进行定常数值模拟，研究了涡动频率比、偏心距对高速泵内部流动的影响。结果表明：在1.0Qd设计工况点，偏心距越小，叶片进口低压区面积越小；在0.6Qd小流量工况点，当涡动频率比小于0时，随着涡动频率比的减少，旋涡的个数逐渐增加，旋涡的面积增大；在1.7Qd大流量工况点，当涡动频率比小于0时，随着偏心距的增大，旋涡的个数增加，旋涡区面积增大；在1.0Qd设计工况点，切向力Ft受涡动频率比以及偏心距的影响很小，且随着流量的变化，它在x轴、y轴、z轴分力的方向均会发生变化。
Among the most factors causing the vibration of the high-speed pumps, one is the whirling motion of the impellers which rotate in an eccentric way with the interaction of the fluid force acting. In order to investigate its internal flow, a high-speed centrifugal pump was simulated based on the research scheme consist of three different flow rates, four different eccentricities and six different whirl frequency ratios by using the commercial software CFX. In addition, the effect of whirl frequency ratio, flow rate and eccentricity on internal flow of high-speed pump was also studied. The results show that: The low pressure area in inlet of impeller are minimum at the design point while eccentricity is close to zero; Under the condition of low flowrate, the number of vortex increased as the whirl frequency decreased when whirl frequency is negative; Under the condition of high flowrate, the number of vortex increased as the eccentricity increased when whirl frequency is negative; The tangential force Ft is weakly dependent on the eccentricities and whirl frequency ratios, while the component force direction on x-axis、y-axis、z-axis changes as the flow rate changes.
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