出口环量分布对泵诱导轮性能的影响
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摘要
为减少对经验参数的依赖性,在诱导轮设计过程中引入出口环量分布规律来控制叶片不同叶高处安放角,根据3种不同函数表达式的出口环量分布,设计了3种不同类型的诱导轮,并通过数值计算的方法,研究了出口环量分布对诱导轮性能的影响.水力设计结果表明:出口环量分布规律可作为诱导轮设计的控制参数,它直接影响诱导轮的包角大小和叶片长度.数值计算结果表明:减小轮毂侧环量,增大轮缘侧环量,可防止叶片轮毂因安放角过大而扭曲严重,进而提高叶片水力效率;同等流量下,二次递增型诱导轮扬程最高,有利于提高离心轮的抗汽蚀性能;二次递增型诱导轮综合性能最好,而线性递增型诱导轮综合性能最差;水平型诱导轮内部流场最稳定,但进口轮缘处有较强旋涡产生.因此,在诱导轮设计过程中,选用二次递增型出口环量分布较为合理.
In order to reduce dependence on empirical parameters during inducer design,different outlet circulation distributions were introduced to regulate blade angle across blade height. Three inducers with different outlet circulation distributions were designed,and their influence on the inducer performance was studied by numerical calculation. Hydraulic design results show that the circulation distribution can be used as a control variable in inducer design and affects both wrap angle and length of inducer blades directly. The numerical simulation results illustrate that decreasing the circulation near the hub and increasing the circulation near the blade tip can prevent inducer blade angle at the hub from being twisted seriously and improve blade hydraulic efficiency. At the same flow rate,the inducer with quadratic increasing circulation distribution has the highest head which can enhance the centrifugal impeller capability of anti-cavitation. The comprehensive performance of the inducer with quadratic in-creasing circulation distribution is the best,while the performance of that with linear increasing circulation distribution is the poorest. The flow field of the inducer with constant circulation distribution is the most stable,but a strong vortex appears near the inlet tip. Accordingly,it is more proper to select the quadratic increasing circulation distribution in inducer hydraulic design.
In order to reduce dependence on empirical parameters during inducer design,different outlet circulation distributions were introduced to regulate blade angle across blade height. Three inducers with different outlet circulation distributions were designed,and their influence on the inducer performance was studied by numerical calculation. Hydraulic design results show that the circulation distribution can be used as a control variable in inducer design and affects both wrap angle and length of inducer blades directly. The numerical simulation results illustrate that decreasing the circulation near the hub and increasing the circulation near the blade tip can prevent inducer blade angle at the hub from being twisted seriously and improve blade hydraulic efficiency. At the same flow rate,the inducer with quadratic increasing circulation distribution has the highest head which can enhance the centrifugal impeller capability of anti-cavitation. The comprehensive performance of the inducer with quadratic in-creasing circulation distribution is the best,while the performance of that with linear increasing circulation distribution is the poorest. The flow field of the inducer with constant circulation distribution is the most stable,but a strong vortex appears near the inlet tip. Accordingly,it is more proper to select the quadratic increasing circulation distribution in inducer hydraulic design.
引文
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[10]郭晓梅,朱祖超,崔宝玲,等.诱导轮内流场数值计算及汽蚀特性分析[J].机械工程学报,2010,46(4):122-128.GUO Xiaomei,ZHU Zuchao,CUI Baoling,et al. Analysis of cavitation and flow computation of inducer[J].Chinese journal of mechanical engineering,2010,46(4):122-128.(in Chinese)
[11]孙强强,蒋劲,张帅帅,等.变螺距诱导轮对高速离心泵空化性能的影响[J].排灌机械工程学报,2017,35(10):856-862.SUN Qiangqiang,JIANG Jin,ZHANG Shuaishuai,et al.Effects of variable pitch inducer on cavitation performance of high-speed centrifugal pumps[J]. Journal of drainage and irrigation machinery engineering,2017,35(10):856-862.(in Chinese)
[12]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011.
[13]袁寿其,施卫东,刘厚林,等.泵理论与技术[M].北京:机械工业出版社,2014.
[2]陆燕荪.中国水电设备制造业的现状与展望[C]//第一届水力发电技术国际会议论文集.北京:中国电力出版社,2006:15-20.
[3] ARROJO S,BENITO Y. A theoretical study of hydrodynamic cavitation[J]. Ultrasonics sonochemistry,2008,15(3):201-203.
[4] BAKIR F,KOUIDRI S,NOGUERA R,et al. Experimental analysis of an axial inducer influence of the shape of the blade leading edge on the performance in cavitating regime[J]. Journal of fluids engineering,2003,122(2):293-301.
[5] MEJRI I,BAKIR F,REY R,et al. Comparison of computational results obtained from a homogeneous cavitation model with experimental investigations of three inducers[J]. Journal of fluids engineering,2006,125(11):1308-1323.
[6]朱祖超,王乐勤.变螺距诱导轮结构设计与理论分析[J].浙江大学学报,1998,32(2):196-200.ZHU Zuchao,WANG Leqin. Structural design and theoretical analysis on variable-pitch inducers[J]. Journal of Zhejiang University,1998,32(2):196-200.(in Chinese)
[7]孙建,孔繁余,季建刚.变螺距诱导轮的设计计算[J].农业机械学报,2007,38(2):102-105.SUN Jian,KONG Fanyu,JI Jiangang. Design calculation on variable-pitch inducers[J]. Transactions of the CSAM,2007,38(2):102-105.(in Chinese)
[8]王勇,李雨,罗凯凯,等.排盐泵热流固耦合特性分析[J].流体机械,2017,45(12):22-26.WANG Yong,LI Yu,LUO Kaikai,et al. The characteristics analysis of pump for excluding salt-water based on fluid-thermal-structural coupling[J]. Fluid machinery,2017,45(12):22-26.(in Chinese)
[9]刘厚林,王健,王勇,等.角度变化系数对变螺距诱导轮性能的影响[J].流体机械,2013,40(10):19-24.LIU Houlin,WANG Jian,WANG Yong,et al. Influence of the angular variation coefficient on variable pitch inducer performance[J]. Fluid machinery, 2013,40(10):19-24.(in Chinese)
[10]郭晓梅,朱祖超,崔宝玲,等.诱导轮内流场数值计算及汽蚀特性分析[J].机械工程学报,2010,46(4):122-128.GUO Xiaomei,ZHU Zuchao,CUI Baoling,et al. Analysis of cavitation and flow computation of inducer[J].Chinese journal of mechanical engineering,2010,46(4):122-128.(in Chinese)
[11]孙强强,蒋劲,张帅帅,等.变螺距诱导轮对高速离心泵空化性能的影响[J].排灌机械工程学报,2017,35(10):856-862.SUN Qiangqiang,JIANG Jin,ZHANG Shuaishuai,et al.Effects of variable pitch inducer on cavitation performance of high-speed centrifugal pumps[J]. Journal of drainage and irrigation machinery engineering,2017,35(10):856-862.(in Chinese)
[12]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011.
[13]袁寿其,施卫东,刘厚林,等.泵理论与技术[M].北京:机械工业出版社,2014.