蜗壳式多级泵首级叶轮切割压力脉动特性
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摘要
为了研究双吸叶轮切割对双蜗壳内压力脉动的影响,选取蜗壳式多级泵首级叶轮为研究对象,基于N-S方程,采用RNG k-ε湍流模型,对首级双吸叶轮在不同叶轮切割工况下进行定常和非定常数值计算.分别选择4种切割方式以及6种切割量,得到不同切割工况下隔舌与出口点的压力脉动时域和频谱图.计算结果表明:不同叶轮切割量对双蜗壳隔舌附近压力变化影响较大,压力变化幅度随切割量的增大先减小后增大,切割量为0.98时,压力波动最小;不同切割方式在一定程度可以改善蜗壳隔舌附近的压力波动,V切和正斜切时压力波动优于正切和反斜切,且反斜切较优于正切压力;对于蜗壳出口点,不同叶轮切割量下,随着切割量的增大,压力脉动依次降低,而不同切割方式影响较小.
In order to study effects of trimmed double suction impeller on pressure pulsation in a double volute case,the first stage of a multistage volute pump was selected as a study object,steady and unsteady fluid flow simulations in the pump were performed based on the N-S equations and RNG k-ε turbulence model when the first stage double suction impeller was trimmed under different conditions,such as six trimmed quantities and four trimming patterns. Pressure fluctuations in time and frequency domains at monitoring points near the tongue and at the volute outlet were obtained. The results show that impeller trimmed quantity has a greater influence on the pressure change near the tongue of double volute case,and the pressure variation amplitude decreases firstly and then increases with increasing trimmed quantity,especially the pressure fluctuation is the smallest when the quantity is 0.98.Some trimming patterns can reduce the pressure fluctuation near the tongue in some degree,the pres-sure fluctuations under V cut and forward skew cut are smaller than those under the straight cut and backward skew cut,and the change in performance with backward skew cut is little smaller than that with straight cut. At the volute outlet point,the pressure fluctuation is decreased with increasing trimmed quantity,but is less affected by the trimming patterns.
In order to study effects of trimmed double suction impeller on pressure pulsation in a double volute case,the first stage of a multistage volute pump was selected as a study object,steady and unsteady fluid flow simulations in the pump were performed based on the N-S equations and RNG k-ε turbulence model when the first stage double suction impeller was trimmed under different conditions,such as six trimmed quantities and four trimming patterns. Pressure fluctuations in time and frequency domains at monitoring points near the tongue and at the volute outlet were obtained. The results show that impeller trimmed quantity has a greater influence on the pressure change near the tongue of double volute case,and the pressure variation amplitude decreases firstly and then increases with increasing trimmed quantity,especially the pressure fluctuation is the smallest when the quantity is 0.98.Some trimming patterns can reduce the pressure fluctuation near the tongue in some degree,the pres-sure fluctuations under V cut and forward skew cut are smaller than those under the straight cut and backward skew cut,and the change in performance with backward skew cut is little smaller than that with straight cut. At the volute outlet point,the pressure fluctuation is decreased with increasing trimmed quantity,but is less affected by the trimming patterns.
引文
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[13]宇晓明,顾伯勤,邵春雷.叶轮切割形式对中比转数离心泵性能的影响[J].农业工程学报,2012,28(21):29-36.YU Xiaoming,GU Boqin,SHAO Chunlei. The form of the impeller cutting ratio affects the performance of speed centrifugal pump[J]. Transactions of the CSAE,2012,28(21):29-36.(in Chinese)
[2]谈明高,丁荣,刘厚林,等.不同叶轮外径下双流道污水泵压力脉动特性分析[J].农业工程学报,2015,31(13):53-59.TAN Minggao,DING Rong,LIU Houlin,et al. Analysis on pressure fluctuation characteristics of double channel sewage pump with different impeller diameters[J].Transactions of the CSAE,2015,31(13):53-59.(in Chinese)
[3]戴菡葳,刘厚林,丁剑,等.离心泵叶轮出口宽度对泵腔内压力脉动分布的影响[J].排灌机械工程学报,2015,33(1):20-25.DAI Hanwei,LIU Houlin,DING Jian,et al. Effects of impeller outlet width on pressure pulsation in two side chambers of centrifugal pump[J]. Journal of drainage and irrigation machinery engineering,2015,33(1):20-25.(in Chinese)
[4]潘希伟,杨曙东,史有程,等. SCR尿素泵研究进展及关键技术分析[J].江苏大学学报(自然科学版),2017,38(3):280-288.PAN Xiwei,YANG Shudong,SHI Youcheng,et al. Research progress and key technologies analysis of SCR urea pump[J]. Journal of Jiangsu University(natural science edition),2017,38(3):280-288.(in Chinese)
[5] ATIA E K,AMRO M A,RACHED B M. Study of pressure fluctuations and induced vibration at blade-passing frequencies of a double volute pump[J]. Arabian journal forence&engineering,2011,36(7):1333-1345.
[6]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. Experimental study on the influence of impeller form on the pressure fluctuation characteristics of double suction centrifugal pump[J]. Journal of mechanical engineering,2011,47(12):133-137.(in Chinese)
[7]丛国辉,王福军.双吸离心泵隔舌区压力脉动特性分析[J].农业机械学报,2008,39(6):60-63.CONG Guohui,WANG Fujun. Double suction centrifugal pump volute tongue pressure fluctuation characteristic analysis[J]. Transactions of the CSAM,2008,39(6):60-63.(in Chinese)
[8]陈颖,李国平,张宁,等.蜗壳喉部面积对离心泵非定常特性的影响[J].流体机械,2017,45(2):38-42.CHEN Ying, LI Guoping, ZHANG Ning, et al.Research on the influence of volute throat area on unsteady characteristics in a centrifugal pump[J]. Fluid machinery,2017,45(2):38-42.(in Chinese)
[9]杨军虎,安策,张利红,等.蜗壳式多级离心泵特性及压力脉动研究[J].水泵技术,2016(2):23-28,45.YANG Junhu,AN Ce,ZHANG Lihong,et al. Study on the characteristics and pressure pulsation of the spiral case centrifugal pump[J]. Pump technology,2016(2):23-28,45.(in Chinese)
[10]刘厚林,周孝华,王凯,等.多级离心泵径向导叶内压力的脉动特性[J].中南大学学报(自然科学版),2014,45(9):3295-3300.LIU Houlin,ZHOU Xiaohua,WANG Kai,et al. The fluctuation characteristics of multistage centrifugal pump radial lobe pressure[J]. Journal of Central South University(natural science edition),2014,45(9):3295-3300.(in Chinese)
[11]郝英杰,顾伯勤,邵春雷.叶轮切割方式对离心泵外特性和压力脉动的影响[J].南京工业大学学报(自然科学版),2015,37(5):42-47.HAO Yingjie,GU Boqin,SHAO Chunlei. Effects of impeller cutting methods on the external characteristics and pressure fluctuation of centrifugal pump[J]. Journal of Nanjing University of Technology(natural science edition),2015,37(5):42-47.(in Chinese)
[12]杨从新,朱旭.高扬程、高转速锅炉给水泵双吸叶轮切割的数值模拟[J].兰州理工大学学报,2016,42(1):61-65.YANG Congxin, ZHU Xu. Numerical simulation of double suction impeller cutting of high lift and high speed boiler feed water pump[J]. Journal of Lanzhou University of Technology,2016,42(1):61-65.(in Chinese)
[13]宇晓明,顾伯勤,邵春雷.叶轮切割形式对中比转数离心泵性能的影响[J].农业工程学报,2012,28(21):29-36.YU Xiaoming,GU Boqin,SHAO Chunlei. The form of the impeller cutting ratio affects the performance of speed centrifugal pump[J]. Transactions of the CSAE,2012,28(21):29-36.(in Chinese)