离心泵流体激励力的研究:叶轮部分

蒋爱华;章艺;靳思宇;黄修长;章振华;华宏星

振动与冲击 ›› 2012, Vol. 31 ›› Issue (22) : 123-127.

PDF(2307 KB)
PDF(2307 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (22) : 123-127.
论文

离心泵流体激励力的研究:叶轮部分

  • 蒋爱华1,章艺2,靳思宇2,黄修长1,章振华1,华宏星1
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RESEARCH ON FLUID EXCITING FORCES ON CENTRIFUGUAL PUMP.PART II: FORCE ON IMPELLER

  • JIANG Ai-Hua1, ZHANG Yi2, JING Si-Yu2,
    ZHANG Zhen-Hua1, HUANG Xiu-Chang1 HUA Hong-Xin1
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摘要

研究叶轮流体激励力是进一步研究离心泵流体激振的基础之一。本文基于对单级单吸式离心泵内非定常流场的CFD计算,通过积分得出叶轮转动过程中叶轮各表面所受空间三个方向的流体和力与和力矩,并分析了各表面对合力与合力矩的贡献,最后通过测试离心泵转轴的径向振动位移以验证所得结果的正确性。结果表明,叶轮各表面流体力空间三向合力与绕三个正交坐标轴的合力矩均周期波动,其中两个相互垂直的叶轮径向流体合力均以叶轮转动一周为一个周期,其余方向合力与绕坐标轴的合力矩均以相邻叶片通过蜗舌的时间一个周期;叶片所受流体径向合力是叶轮所受径向流体力的主要来源,叶轮前盖板外表面与后盖板外表面之间的压力差决定叶轮所受轴向力的大小,前盖板流体压力分布的不均匀程度决定叶轮绕径向转矩的大小,叶片所受流体力是叶轮绕转轴转矩的主要原因。

Abstract

To research centrifugal pump vibration by fluid inciting, impeller’s fluid forces and torques should be known firstly. This research calculated three-direction gross fluid forces and torques in process of impeller rotating based on integration forces on impeller surfaces after transient CFD analyses on single-stage single-suction centrifugal pump. And contribution of each impeller surface force to the three-direction gross fluid forces and torques is also analyzed. At last, measurement on two vertical radial vibration displacements of impeller rotor was also finished to validate the radial fluid forces on impeller. The result shows that, all the gross forces and torques periodically fluctuate, and their cycle equals to the time interval which two adjacent vanes pass volute tone, except the radial forces’ which is the period that impeller rotates one circuit. Besides, it also can be known that from the results that the radial forces of vanes are the main contributions of impeller radial forces, the axial force of impeller comes from the discrepancy between impeller front cover outer surface pressure and back cover pressure, and the extend of asymmetry pressure distribution on front cover outer face decides the grade of radial impeller torques, while axis impeller torque mainly roots from vanes’ fluid forces.

关键词

离心泵 / 叶轮 / 流体激振 / CFD / 转子动力学

Key words

centrifugal pump / impeller / fluid exciting vibration / CFD

引用本文

导出引用
蒋爱华;章艺;靳思宇;黄修长;章振华;华宏星. 离心泵流体激励力的研究:叶轮部分[J]. 振动与冲击, 2012, 31(22): 123-127
JIANG Ai-Hua;ZHANG Yi;JING Si-Yu;ZHANG Zhen-Hua;HUANG Xiu-Chang HUA Hong-Xin. RESEARCH ON FLUID EXCITING FORCES ON CENTRIFUGUAL PUMP.PART II: FORCE ON IMPELLER[J]. Journal of Vibration and Shock, 2012, 31(22): 123-127

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