导叶时序位置对离心泵叶片载荷影响的数值模拟
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摘要
采用结构化网格及SST湍流模型,对不同导叶时序位置下离心泵内部流场进行三维非定常数值模拟,并对模拟结果进行试验验证,研究时序效应对叶轮叶片和导叶叶片载荷的影响.结果表明:当隔舌大约处在2个导叶中间(cl0,cl5位置)时,蜗壳不对称作用对叶轮内部流场影响降低,叶轮叶片压力面载荷增大,叶轮做功能力较好;当叶片逐渐靠近蜗壳隔舌时,蜗壳不对称作用对叶轮内部流场影响增大,叶片出口吸力面大于压力面载荷的位置逐渐向叶片中段偏移,导致叶轮做功能力逐渐降低;导叶叶片载荷分布受导叶与隔舌相对位置的影响较为明显.当导叶叶片尾缘靠近蜗壳隔舌时,导叶叶片载荷出现吸力面大于压力面的情况.
Unsteady numerical simulations of internal flow field in a centrifugal pump in different clock positions of a diffuser related to the volute tongue were carried out by using structured-grid and the SST turbulence model and influence of clock effect on blade loadings in the impeller and radial diffuser was studied. The results show that with increasing flow rate,the pressure loading on impeller blades and diffuser vanes is decreased gradually,indicating gradually reduced work done by the impeller. The pressure on the diffuser vane suction side is higher than on the pressure side due to influence of the volute tongue. When the tongue is located in the middle of two diffuser vanes,the pressure side of impeller blades is subject to a larger loading,suggesting the impeller with a better capability of working.When a diffuser vane is positioned closely to the volute tongue gradually,the region of the loading on the vane suction side is higher than on the pressure side in the diffuser,and is extended into the diffusion section from the spiral section. The pressure pulsation intensity in the spiral section increases gradually,however,the intensity in diffusion section is decreased steadily. This phenomenon indicates that the pressure pulsation intensity in the diffusion section is affected mainly by the volute tongue,but the intensity in the spiral section is done basically by the leading edge of diffuser vane.
Unsteady numerical simulations of internal flow field in a centrifugal pump in different clock positions of a diffuser related to the volute tongue were carried out by using structured-grid and the SST turbulence model and influence of clock effect on blade loadings in the impeller and radial diffuser was studied. The results show that with increasing flow rate,the pressure loading on impeller blades and diffuser vanes is decreased gradually,indicating gradually reduced work done by the impeller. The pressure on the diffuser vane suction side is higher than on the pressure side due to influence of the volute tongue. When the tongue is located in the middle of two diffuser vanes,the pressure side of impeller blades is subject to a larger loading,suggesting the impeller with a better capability of working.When a diffuser vane is positioned closely to the volute tongue gradually,the region of the loading on the vane suction side is higher than on the pressure side in the diffuser,and is extended into the diffusion section from the spiral section. The pressure pulsation intensity in the spiral section increases gradually,however,the intensity in diffusion section is decreased steadily. This phenomenon indicates that the pressure pulsation intensity in the diffusion section is affected mainly by the volute tongue,but the intensity in the spiral section is done basically by the leading edge of diffuser vane.
引文
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[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&irrigation machinery engineering,2014,32(1):23-28.(in Chinese)
[13]王文杰,袁寿其,裴吉,等.时序效应对导叶式离心泵内部压力脉动影响的数值分析[J].机械工程学报,2015,51(4):185-192.WANG Wenjie,YUAN Shouqi,PEI Ji,et al.Numerical analysis of the clocking effect on the pressure fluctuation in the centrifugal pump with vaned diffuser[J].Journal of mechanical engineering,2015,51(4):185-192.(in Chinese)
[14]刘厚林,崔健保,谈明高,等,离心泵内部流动时序效应的CFD计算[J].农业工程学报,2013,29(14):67-73.LIU Houlin,CUI Jianbao,TAN Minggao,et al.CFDcalculation of clocking effect on centrifugal pump[J].Transactions of the CSAE,2013,29(14):67-73.(in Chinese)
[15]JIANG W,LI G,LIU P F,et al.Numerical investigation of influence of the clocking effect on the unsteady pressure fluctuations and radial forces in the centrifugal pump with vaned diffuser[J].International communications in heat&mass transfer,2015,71:164-171.
[2]SCHENNACH O,PECNIK R,PARADISO B,et al.The effect of vane clocking on the unsteady flow field in a one and a half stage transonic turbine[C]//Proceedings of the ASME Turbo Expo 2007:Power for Land,Sea,and Air.[S.l.]:American Society of Mechanical Engineers,2007.
[3]HALDEMAN C W,DUNN M G,BARTER J W,et al.Experimental investigation of vane clocking in a one and one-half stage high pressure turbine[J].Journal of turbomachinery,2005,127(3):512-521.
[4]OUML S,STOFFEL N.Experimental investigation of the clocking effect in a 1.5 stage axial turbine-part I:timeaveraged results[J].Journal of turbomachinery,2009,131(2):1003-1014.
[5]K?NIG S,STOFFEL B,SCHOBEIRI M T.Experimental investigation of the clocking effect in a 1.5 stage axial turbine-part II:unsteady results and boundary layer behavior[J].Journal of turbomachinery,2009,131(2):021004.
[6]SCHENNACH O,WOISETSCHLAGER J,FUCHS A,et al.Experimental investigations of clocking in a oneand-a-half-stage transonic turbine using laser Doppler velocimetry and a fast response aerodynamic pressure probe[J].Journal of turbomachinery,2007,129(2):541-552.
[7]刘思蓉,王强,任洋,等.涡轮增压器压气机流场仿真分析[J].流体机械,2018,46(3):12,23-27.LIU Sirong,WANG Qiang,REN Yang,et al.Simulation analysis of compressor flow field in turbocharger[J].Fluid machinery,2018,46(3):12,23-27.(in Chinese)
[8]姜华,席光,张炜,等.离心压缩机静叶间时序效应的实验研究[J].工程热物理学报,2009,30(6):964-966.JIANG Hua,XI Guang,ZHANG Wei,et al.Experimental investigation of stator clocking in a centrifugal compressor[J].Journal of engineering thermophysics,2009,30(6):964-966.(in Chinese)
[9]任晓栋,顾春伟.1.5级跨声压气机中时序效应的研究[J].航空动力学报,2010(4):891-896.REN Xiaodong,GU Chunwei.Investigation on clocking effect of 1.5-stage transonic compressor[J].Journal of aerospace power,2010(4):891-896.(in Chinese)
[10]郝苜婷,谢蓉,关亮.时序效应对离心压缩机叶片非定常气动负荷影响[J].风机技术,2016(1):15-21.[10]HAO Muting,XIE Rong,GUAN Liang.Clocking effect on the unsteady aerodynamic loading on the blade in the centrifugal compressor[J].Compressor blower&fan technology,2016(1):15-21.(in Chinese)
[11]SUN J J,WANG S J,TSUKAMOTO H.Investigation of unsteady flow in a diffuser pump[J].Chinese journal of aeronautics,2001,14(3):134-139.
[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&irrigation machinery engineering,2014,32(1):23-28.(in Chinese)
[13]王文杰,袁寿其,裴吉,等.时序效应对导叶式离心泵内部压力脉动影响的数值分析[J].机械工程学报,2015,51(4):185-192.WANG Wenjie,YUAN Shouqi,PEI Ji,et al.Numerical analysis of the clocking effect on the pressure fluctuation in the centrifugal pump with vaned diffuser[J].Journal of mechanical engineering,2015,51(4):185-192.(in Chinese)
[14]刘厚林,崔健保,谈明高,等,离心泵内部流动时序效应的CFD计算[J].农业工程学报,2013,29(14):67-73.LIU Houlin,CUI Jianbao,TAN Minggao,et al.CFDcalculation of clocking effect on centrifugal pump[J].Transactions of the CSAE,2013,29(14):67-73.(in Chinese)
[15]JIANG W,LI G,LIU P F,et al.Numerical investigation of influence of the clocking effect on the unsteady pressure fluctuations and radial forces in the centrifugal pump with vaned diffuser[J].International communications in heat&mass transfer,2015,71:164-171.