离心泵回流漩涡空化的非定常特性研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (16) : 24-30.

论文

离心泵回流漩涡空化的非定常特性研究

袁建平1，侯敬生1，付燕霞2，胡纪伟2，张皓阳2，沈陈栋3

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A study on the unsteady characteristics of the backflow vortex cavitation in a centrifugal pump

YUAN Jianping1,HOU Jingsheng1,FU Yanxia2,HU Jiwei2,ZHANG Haoyang2,SHEN Chendong3

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文章历史 +

摘要

为研究离心泵回流漩涡空化的非定常特性，采用ANSYS CFX 14.5，基于标准k-ɛ湍流模型和Rayleigh-Plesset方程的均相流空化模型，在小流量工况点0.4Qd下，针对IS65-50-160离心泵进行非定常数值模拟，获得了回流漩涡空化的发展过程及叶轮叶片前缘处的压力脉动特性，并与其试验结果进行了对比。同时，针对叶轮和叶片前缘处的压力脉动监测点进行了相位交叉性分析。结果表明：在0.4Qd工况下，当空化系数σ=0.056时，回流漩涡的发展会随着叶片旋转而发生变化，且整个过程中存在3个旋转分量；叶轮进口面未出现旋转分量，而叶片前缘附近出现了3个旋转分量，其传播频率比分别为0.35、0.66与1.95。

Abstract

In order to analyze the unsteady characteristics of the backflow vortex cavitation in a centrifugal pump, the standard k-ε turbulence model coupled with the homogenous cavitation model based on the simplified Rayleigh-Plesset equation were applied to simulate the unsteady inner flow in a centrifugal pump named IS65-50-160 at the low flow rate of 0.4Q_d (40% of the design flow rate) through ANSYS CFX 14.5.The developing process of the backflow vortex cavitation as well as the pressure fluctuation at the blade leading edge were obtained and compared with experimental results.The phase-crossing analysis of the monitoring points of pressure pulsation at the blade leading edge was also carried out.The results show that at the low flow rate of 0.4Q_d and as the cavitation number σ is the value of σ=0.056, the patterns of the developing backflow vortex cavitation involving basically three rotating components near the blade leading edge in the whole process will change with the blade rotating.There is no rotating component near the impeller eye.The propagation speed ratios of the three rotating components were 0.35, 0.66 and 1.95, respectively.

导出引用

袁建平1，侯敬生1，付燕霞2，胡纪伟2，张皓阳2，沈陈栋3. 离心泵回流漩涡空化的非定常特性研究[J]. 振动与冲击, 2018, 37(16): 24-30

YUAN Jianping1,HOU Jingsheng1,FU Yanxia2,HU Jiwei2,ZHANG Haoyang2,SHEN Chendong3. A study on the unsteady characteristics of the backflow vortex cavitation in a centrifugal pump[J]. Journal of Vibration and Shock, 2018, 37(16): 24-30

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