双吸离心泵作液力透平流致振动数值研究
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摘要
以某一双吸式离心泵为研究对象,分析了双吸泵作液力透平与泵工况下的非定常压力脉动,基于有限元法(FEM),针对双吸离心泵作液力透平和泵工况下泵壳内表面的流体压力激励,进行基于泵壳模态的强迫振动响应计算,得到了泵壳上的响应速度分布和泵壳表面监测点的振动响应速度频谱.结果表明:叶轮与隔舌相互作用导致隔舌附近非定常特性明显;双吸泵内的压力脉动主要受低频率波的影响,以转频和叶片通过频率为主.由于受到叶轮转动与流体压力激振力的影响,振动速度响应集中在转频、叶片通过频率以及其谐频附近;泵壳第3阶频率880. 083 Hz与3倍叶频884. 991 Hz比较接近,引发了一定程度的共振.揭示了泵壳振动响应速度随着频率变化规律,为后续减振降噪研究提供了理论基础.
A double-suction centrifugal pump was chosen as the research objective to analyze the unsteady pressure fluctuations. Based on the finite element method,the forced vibration response calculations were completed based on the mode of the pump case for the different fluid pressures on the internal face,when the double-suction pump running as a turbine and as a pump,respectively. It is found that the interaction between the impeller and the tongue causes the unsteady characteristics near the tongue. In addition,the pressure fluctuation is mainly affected by the low frequency wave,and the response velocity is concentrated in the frequency of rotation,blade passing frequency and harmonic frequency due to impeller rotation and pressure fluctuation characteristics. The third order frequency880. 083 Hz of the pump case is close to the 3 times BPE 884. 991 Hz,which causes the resonance phenomenon. It reveals the change rule of the response velocity of the vibration of the pump case and provides the reference for the further research of reduction of vibration and noise.
A double-suction centrifugal pump was chosen as the research objective to analyze the unsteady pressure fluctuations. Based on the finite element method,the forced vibration response calculations were completed based on the mode of the pump case for the different fluid pressures on the internal face,when the double-suction pump running as a turbine and as a pump,respectively. It is found that the interaction between the impeller and the tongue causes the unsteady characteristics near the tongue. In addition,the pressure fluctuation is mainly affected by the low frequency wave,and the response velocity is concentrated in the frequency of rotation,blade passing frequency and harmonic frequency due to impeller rotation and pressure fluctuation characteristics. The third order frequency880. 083 Hz of the pump case is close to the 3 times BPE 884. 991 Hz,which causes the resonance phenomenon. It reveals the change rule of the response velocity of the vibration of the pump case and provides the reference for the further research of reduction of vibration and noise.
引文
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[2]王镇宇,杨爱玲,戴韧,等.离心泵流动诱导噪声的数值预测[J].机械工程学报,2012,48(6):162-167.WANG Zhenyu,YANG Ailing,DAI Ren,et al. Numerical prediction of the flow-induced noise of centrifugal pump[J]. Journal of mechanical engineering,2012,48(6):162-167.(in Chinese)
[3]刘瑞青,崔冬,王君,等.扭转角对圆弧扭叶型罗茨真空泵转子性能的影响[J].流体机械,2018,46(5):44-48.LIU Ruiqing,CUI Dong,WANG Jun,et al. Influence of twist angle on performance of arc twisted roots vacuum pump rotor[J]. Fluid machinery,2018,46(5):44-48.(in Chinese)
[4]姚志峰,王福军,杨敏,等.叶轮形式对双吸离心泵压力脉动特性影响试验研究[J].机械工程学报,2011,47(12):133-137.YAO Zhifeng,WANG Fujun,YANG Min,et al. Effects of impeller type on pressure fluctuations in double-suction centrifugal pump[J]. Journal of mechanical engineering,2011,47(12):133-137.(in Chinese)
[5]司乔瑞,袁寿其,袁建平,等.叶片与隔舌干涉对离心泵性能和压力脉动影响的数值研究[J].流体机械,2012,40(8):22-26.SI Qiaorui, YUAN Shouqi, YUAN Jianping, et al.Effect of interaction between blade and volute tongue of centrifugal pumps on the performance and pressure pulsation[J]. Fluid machinery,2012,40(8):22-26.(in Chinese)
[6]蒋爱华,张志谊,章艺,等.离心泵噪声研究的综述和展望[J].振动与冲击,2011,30(2):77-84.JIANG Aihua,ZHANG Zhiyi,ZHANG Yi,et al. Review and outlook of studying on noise of centrifugal pumps[J]. Journal of vibration and shock,2011,30(2):77-84.(in Chinese)
[7]RAUL B,JORGE P,EDUARDO B. Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points[J]. Computers&fluids,2010,39:859-870.
[8]SPENCE R,AMARAL-TEIXEIRA J. CFD parametric study of geometrical variations on the pressure pulsations and performance characteristics of a centrifugal pump[J]. Computers&fluids,2009(38):1243-1257.
[9]CHOI J S,MCLAUGHLIN D K,THOMPSON D E. Experiments on the unsteady flow field and noise generation in a centrifugal pump impeller[J]. Journal of sound and vibration,2003,263(3):493-514.
[10]王春林,彭海菠,丁剑,等.基于响应面法的消防泵S型叶片改进优化设计[J].机械工程学报,2013,49(10):170-177.WANG Chunlin,PENG Haibo,DING Jian,et al. Optimization for S-type blade of fire pump based on response surface method[J]. Journal of mechanical engineering,2013,49(10):170-177.(in Chinese)
[11]董亮,代翠,孔繁余,等.叶片出口安放角对离心泵作透平噪声的影响[J].农业工程学报,2015,31(6):69-75.DONG Liang,DAI Cui,KONG Fanyu,et al. Impact of blade outlet angle on acoustic of centrifugal pump as turbine[J]. Transactions of the CSAE,2015,31(6):69-75.(in Chinese)
[12]杨爱玲,徐洋,李国平,等.叶片载荷对离心泵内流动激励力及噪声的影响[J].排灌机械工程学报,2014,32(1):23-28.YANG Ailing,XU Yang,LI Guoping,et al. Effect of blade loading on fluid-induced exciting force and noise in centrifugal pumps[J]. Journal of drainage and irrigation machinery engineering,2014,32(1):23-28.(in Chinese)
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