1. State Key Laboratory of Mechanical System and Vibration, Shang Hai JiaoTong University, Shanghai, 2002402. 704 Research Institution, China Shipbuilding Industry Corporation, Shanghai, 200031
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.
2012, Vol. 31 
