采用Relizablek～ε模型对具有径向回流平衡孔以及传统轴向回流平衡孔和无平衡孔结构的低比速离心泵进行全流场非定常数值模拟,并进行时域分析和频域分析.研究结果表明:平衡孔采用径向回流方式、传统轴向回流方式以及无平衡孔结构这3种方案时,离心泵的叶轮进口、蜗壳出口以及蜗壳隔舌处的流体均随时间呈周期性波动,脉动频率以叶片通过频率为主；具有径向回流平衡孔的低比速离心泵与其他2种结构形式的低比速离心泵相比,能够有效地改善蜗壳隔舌处的压力脉动情况.%By means of the k-ε model, numerical simulation of unsteady full flow fields of low specific-speed centrifugal pump with three different structures, that is, radial reflux balance hole, traditional axial reflux balance hole and no balance hole, was carried out. The time domain and frequency domain were analyzed. The results show that for the above three kinds of structures, the fluid at the inlet of the impeller, outlet and tongue of the volute exhibits cyclic fluctuation with the time, and the fluctuating frequency is mainly the passing frequency of the blade. Compared with that with the other two structures, the low specific-speed centrifugal pump with radial reflux balance hole will effectively improve the pressure fluctuation at the tongue of the volute.
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