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| Effects of blade geometry parameters on radial force and vibration of inline circulator pump |
| WU Deng-Hao, YUAN Shou-Qi, REN Yun, ZHANG Jin-Feng |
(1.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Grundfos Research and Development Center, Suzhou， Jiangsu 215126, China) |
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Abstract To solve the vibration issue of one inline circulator pump with specific speed of 221, on the premise of having similar energy characteristics, the blade geometry parameters Z，β2，β1 were optimized to lower the vibration amplitude. In order to investigate the effects of blade geometry parameters on pressure pulsation, radial force and vibration of an inline circulator pump, by applying CFX, the full unsteady flow numerical simulations of inline circulator pumps in different flow conditions were executed both on preoptimized impeller A and postoptimized impeller B. The results indicate that the overall pressure pulsation, radial force and radial force fluctuation amplitude of impeller A are higher than those of impeller B; and blade passing frequency and its harmonics are the domain frequencies for pressure pulsation. Meanwhile, to get a deep understanding on the effect of radial force changing on vibration because of changing the blade geometry parameters, the experimental vibration tests were conducted to measure the vibration velocity of inline circulator pumps with impeller A and impeller B. Result is that vibration amplitudes of impeller A are higher than impeller B under different flow conditions, and blade passing frequency and its harmonics are the domain frequencies for pump vibration. In addition, to further study the effect of the changes of pressure pulsation and radial forces caused by changing blade geometry parameters on vibration, vibration velocities of the inline circulator pump with impeller A and impeller B respectively were measured. The vibration results show that, under different working conditions, the vibration amplitude of impeller A is stronger than impeller B. Blade frequency and its harmonics are the main incentives of the vibration of inline circulator pumps. The comparison between computational and experimental results shows that impeller A has higher vibration amplitude because there are higher pressure pulsation, radial forces and radial force fluctuation amplitude it served. The vibration velocity of postoptimized pump is lower than 1.8 mm/s in the flow range from 04Qd to 1.3Qd, and satisfies the ISO 10816 standard.
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Received: 19 November 2012
Published: 30 April 2013
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