Numerical Study of Pressure Pulsation of Centrifugal Pumps with the Compressible Mode
Numerical Study of Pressure Pulsation of Centrifugal Pumps with the Compressible Mode
复制标题
可压缩模式离心泵压力脉动的数值研究
DOI：
10.1007/s11630-018-1071-7
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发表时间：
2019-02-01
影响因子：
2.5
通讯作者：
Xie Tian
中科院分区：
文献类型：
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作者：
Yang Jun;Liu Jun;Xie Tian
在水力机械仿真中，水的可压缩性往往被忽略。然而，基于实验和数值研究，发现水的可压缩性会影响泵中某些频率下的压力脉动的大小。因此，为了研究水体可压缩性的影响，利用Tait方程建立了可压缩性模型。利用该模型计算了离心泵在不同工况下的内部流动。计算结果与不可压缩结果进行了比较，结果表明水的可压缩性对性能参数的影响很小。但在某些离散频率下，它会影响压力脉动的幅值，特别是在叶轮出口和蜗壳舌部，这两个区域分别出现明显的射流-尾迹和动静干涉。在非设计工况下，水流的可压缩性对水流脉动的影响较大。因此，在离心泵非定常流动的数值模拟中，特别是在非定常流动较强的区域和非设计工况下，考虑工质的可压缩性是十分必要的。
The compressible effect of water is often neglected in the simulation of hydraulic machinery. However, based on experimental and numerical study, it is found that the compressibility of water could influence the magnitude of the pressure pulsation at some frequency in the pump. Therefore, in order to investigate the influence of water compressibility, compressible model is established by using Tait equation. The internal flow of centrifugal pump under different conditions is calculated by this model. The calculated results are compared with the incompressible results, and it is indicated that the compressibility of water has little effect on the performance parameters. But it affects the amplitude of pressure fluctuations at some discrete frequency, especially at the outlet of impeller and volute tongue where significant jet-wake and rotor/stator interaction appears respectively. Meanwhile, water compressibility makes greater influence on the flow pulsation under off-design condition. Therefore, it is necessary to consider the compressibility of working medium in the numerical simulation of unsteady flow in centrifugal pumps, especially in area with strong unsteady flow and at off-design condition.