基于直接边界元法的潜水排污泵内流噪声数值模拟
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摘要
为了揭示不同湍流模型对超厚叶片潜水排污泵流动特性及噪声的影响,以1台超厚叶片低比转数潜水排污泵为模型,基于CFD理论与Lighthill声比拟理论,对潜水排污泵的流场和声场进行数值模拟,并对不同工况下(0. 6QN,0. 8QN,1. 0QN,1. 2QN,1. 4QN)潜水排污泵的内部压力分布特性进行分析,同时探讨了内声场和外声场的噪声产生原因及分布传播特性.数值模拟结果表明,采用SST模型得到的性能曲线最接近试验结果;当叶轮从时刻a旋转到时刻d时,隔舌附近的高压区增大;隔舌处压力脉动最剧烈,这说明隔舌处是主要噪声源;在最优工况附近噪声较小,偏离最优工况处噪声较大;噪声极大值均出现在30°～75°内,极小值在225°～250°内.
In order to reveal the influence of the different turbulence models on the flow characteristics and noise in the submersible sewage pump,a low specific speed pump with ultra-thick blades was adopted as a model. The computational fluid dynamics( CFD) based on the Lighthill equation theory was adopted to calculate the flow field and sound field respectively. The pressure distribution at different flow rates of 0. 6 QN,0. 8 QN,1. 0 QN,1. 2 QN,1. 4 QNwas analyzed,and the causes of noise generation and distribution characteristics in the inner and outer fields were discussed. The results show that the performance curve obtained by SST model is the closest to the test results. When the impeller rotates from moment a to moment d,the high-pressure area near the tongue increases. The pressure fluctuation at tongue is the most dramatic,indicating that the tongue is the main noise source. The noise is lower near the optimal condition and the larger noise deviates from the optimal condition; the maximum noise appears at 30°-75°,the minimum value appears at 225°-250°.
In order to reveal the influence of the different turbulence models on the flow characteristics and noise in the submersible sewage pump,a low specific speed pump with ultra-thick blades was adopted as a model. The computational fluid dynamics( CFD) based on the Lighthill equation theory was adopted to calculate the flow field and sound field respectively. The pressure distribution at different flow rates of 0. 6 QN,0. 8 QN,1. 0 QN,1. 2 QN,1. 4 QNwas analyzed,and the causes of noise generation and distribution characteristics in the inner and outer fields were discussed. The results show that the performance curve obtained by SST model is the closest to the test results. When the impeller rotates from moment a to moment d,the high-pressure area near the tongue increases. The pressure fluctuation at tongue is the most dramatic,indicating that the tongue is the main noise source. The noise is lower near the optimal condition and the larger noise deviates from the optimal condition; the maximum noise appears at 30°-75°,the minimum value appears at 225°-250°.
引文
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[3]张德胜,施卫东,陈斌,等.低比转速离心泵内部流场分析及试验[J].农业工程学报,2010,26(11):108-112.ZHANG Desheng,SHI Weidong,CHEN Bin,et al.Turbulence analysis and experiments of low-specificspeed centrifugal pump[J]. Transactions of the CSAE,2010,26(11):108-112.(in Chinese)
[4]陈红军,张铁罕,王昌荣. SDZ310型超高压多级离心泵的结构特性[J].排灌机械工程学报,2018,36(7):567-572.CHEN Hongjun,ZHANG Tiehan,WANG Changrong.Structural characteristics of ultrahigh-pressure multistage centrifugal pump typed SDZ310[J]. Journal of drainage and irrigation machinery engineering,2018,36(7):567-572.(in Chinese)
[5]李跃,施卫东,韩笑笑,等.不同结构形式对串并联离心泵振动特性的影响[J].排灌机械工程学报,2015,33(9):744-749.LI Yue,SHI Weidong,HAN Xiaoxiao,et al. Effects of pump hydraulic structure on vibration characteristic of series-parallel centrifugal pump[J]. Journal of drainage and irrigation machinery engineering,2015,33(9):744-749.(in Chinese)
[6] SI Qiaorui,YUAN Shouqi,YUAN Jianping,et al. Study on the influence of volute to flow-induced noise in centrifugal pump[J]. Advanced materials research,2012,516:1009-1017.
[7] GIOVANNA Cavazzini. Roter-stator interaction in radial turbomachine:experimental and numerical investigation[M]. Lap Lambert Academic Publishing,2013.
[8] GAO Bo,YANG Minguan,LI Zhong,et al. Experimental study on cavitation induced low frequency vibration in a centrifugal pump[J]. Journal of engineering thermophysics,2012,33(6):965-968.
[9] JOSE Gonzalez,JOAQUIN Fernandez,EDUARDO Blanco,et al. Numerical simulation of the dynamic effects due to impeller-volute interaction in a centrifugal pump[J]. Transactions of the ASME,2002,124(2):348-355.
[10] ATIFI A,BENMANDSOUR S,BOIS G,et al. Numeirical and experimental comparison of the vaned diffuser interaction inside the impeller velocity field of a centrifugal impeller[J]. Science China,2011,54(1):1-9.
[11] DAZIN A,CAVAZZINI G,PAVESI G,et al. Highspeed stereoscopic PIV study of rotating instabilities in a radial vaneless diffuser[J]. Experiments in fluids,2011,51:83-93.
[12]王勇,刘庆,刘东喜,等.不同叶片冲角离心泵内流诱导振动噪声研究[J].流体机械,2013,41(7):1-4.WANG Yong,LIU Qing,LIU Dongxi,et al. Analysis of flow induced vibration and noise in centrifugal pumps with different blade inlet incidence angle[J]. Fluid machinery,2013,41(7):1-4.(in Chinese)
[13] JORGE P,JAVIER P,RAL B,et al. A simple acoustic model to characterize the internal low frequency sound field in centrifugal pumps[J]. Applied acoustics,2011,72:59-64.
[14] CHU S,DONG R,KATZ J. Relationship between unsteady flow,pressure fluctuations,and noise in a centrifugal pump——part A:use of PDV data to compute the pressure field[J]. Journal of fluids engineering,1995,117(1):24-29.
[15] CHU S,DONG R,KATZ J. Relationship between unsteady flow,pressure fluctuations,and noise in a centrifugal pump——part B:effects of blade-tongue interactions[J]. Journal of fluids engineering,1995,117(1):30-35.
[16] DONG R,CHU S,KATZ J. Effect of modification to tongue and impeller geometry on unsteady flow,pressure fluctuations,and noise in a centrifugal pump[J].ASME Journal of fluids engineering,1997,119(3):506-515.