不同空化程度下离心泵流固耦合特性研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (23) : 203-208.

论文

不同空化程度下离心泵流固耦合特性研究

牟介刚，陈莹，谷云庆，郑水华，钱亨

作者信息 +

Centrifugal pump fluid-structure interaction characteristics under different cavitation conditions

MOU Jiegang ，CHEN Ying，GU Yunqing，ZHENG Shuihua， QIAN Heng

Author information +

文章历史 +

摘要

针对离心泵空化下流固耦合问题，采用完全空化和气液两相模型，对离心泵空化进行了数值模拟计算，结合单向耦合计算方法求解了不同空化程度下转子系统的变形。分析了空化时叶轮上气泡、静压、液体相对速度分布情况以及蜗壳内部压力脉动和叶轮径向力特性，研究空化对离心泵内部流场和对转子系统变形的影响。结果表明，叶片吸力面较压力面的气泡体积和气泡区更大；随着空化的发展叶轮静压分布越不均匀；严重空化时叶轮上的气泡会堵塞流道，引起脱流现象，生成漩涡；空化导致压力脉动增强，径向力分布不规律；空化影响了离心泵转子系统的变形，空化引起的漩涡造成叶轮非轴对称变形。

Abstract

For fluid-structure interaction problems of centrifugal pump cavitation, centrifugal pump cavitation was simulated numerically based on the full cavitation and gas-liquid two-phase model, and the deformation of the rotor system was simulated under different cavitation conditions using one-way coupling. Cavitation bubbles on the impeller, static pressure, relative liquid velocity distribution of centrifugal pump and pressure pulsation in volute, impeller radial force characteristics were analyzed, the effect on the internal flow field and rotor system deformations were studied. The results show that the vapor volume fraction and area on blade suction surface are larger than blade pressure surface, impeller static pressure distribution is more uneven with cavitation development. The bubbles on the impeller will plug flow channel under serious cavitation, results in flow separation phenomenon, then vortex is generated. Cavitation lead to the increase of pressure fluctuation in volute and irregular distribution of radial force. Cavitation has an effect on the deformation of centrifugal pump rotor system, impeller appears non-axisymmetric deformation caused by vortex under cavitation condition.

导出引用

牟介刚，陈莹，谷云庆，郑水华，钱亨. 不同空化程度下离心泵流固耦合特性研究[J]. 振动与冲击, 2016, 35(23): 203-208

MOU Jiegang,CHEN Ying，GU Yunqing，ZHENG Shuihua， QIAN Heng. Centrifugal pump fluid-structure interaction characteristics under different cavitation conditions[J]. Journal of Vibration and Shock, 2016, 35(23): 203-208

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