摘要
研究叶轮流体激励力为研究离心泵流体激振基础之一。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方向流体力与力矩;分析各表面对合力及合力矩贡献;通过测试离心泵转轴径向振动位移验证所得结果表明,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大小,前盖板流体压力分布不均匀程度决定叶轮绕径向转矩大小,叶片所受流体力是叶轮绕转轴转矩的主要原因。
To study centrifugal pump vibration excited by fluid, fluid forces and torques on its impeller should be known firstly, Here, three-direction gross fluid forces and torques on impeller surfaces were obtained in process of impeller rotating through numerical integration after transient CFD calculation for non-steady flow field in a single-stage single-suction centrifugal pump. Contribution of each impeller surface to the three-direction gross fluid forces and torques was also analyzed. At last, measurement of two directions radial vibration displacements of impeller rotor was done to validate the radial fluid forces on impeller. The results showed that all the gross forces and torques periodically fluctuate, and their cycle equals to the time interval for two adjacent vanes to pass volute tone, but the radial forces period equals to the time for impeller to rotate one cyale; besides, the radial fluid forces exerted on vanes are the main cause 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 level of asymmetric pressure distribution on front cover outer face decides the magnitude of impeller torques about the radial axis, but impeller torque about the ratating axis mainly comes from fluid forces exerted on vanes..
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第22期123-127,共5页
Journal of Vibration and Shock
基金
上海交通大学科研专项
