simpop

普通会员

【JTS原创论文】水压缩性对离心泵内压力脉动的影响


文章期号

Journal of Thermal Science Vol.28, No.1 (2019) 106-114

https://doi.org/10.1007/s11630-018-1071-7

英文题目

Influence of Water Compressibility on Pressure  Pulsations in Centrifugal Pumps

中文题目

水压缩性对离心泵内压力脉动的影响

作  者

阳君,刘俊,刘小华*,谢田

作者单位

上海交通大学 航空航天学院

 

中文摘要

为了研究水压缩性对离心泵内压力脉动的影响,采用Tait方程建立可压缩模型,计算不同流量工况下离心泵的内部流动特征。研究结果表明,水的压缩性对泵外部性能影响甚微。但是,在射流尾迹较为严重的叶轮出口及动静干涉作用显著的隔舌附近,不考虑水的可压缩性引起的数值伪波对结果影响较大。同时,在不同运行工况下水压缩性对离心泵内部流动及压力脉动影响也不相同。结果表明水压缩性对非设计条件下的流动脉动影响较大。因此,对于离心泵内部流动的研究,尤其是在非设计工况及非定常流动较为剧烈区域,需要考虑水的可压缩性。

 

 

Abstract

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.

 

Keywords

water compressibility, Tait equation, unsteady flow, pressure pulsations, centrifugal pump



下载链接

https://link.springer.com/article/10.1007/s11630-018-1071-7