深海扬矿泵内部非定常流体径向力研究
|
摘要
基于深海扬矿泵是深海采矿系统的关键设备,泵内部流动较复杂,无法用公式对流体径向力进行理论计算等,采用试验和数值模拟方法对其作用规律以及产生机理进行研究。首先,对泵内流场进行定常数值计算。然后,进行非定常数值计算,得到泵内压力和径向力的时域和频域图。研究结果表明:在对泵内流场进行定常数值计算时,发现扬程、功率和效率的模拟值与试验值较吻合,从而验证了数值模拟方法的可行性;叶轮和导叶的动静干涉是泵内产生压力脉动和不平衡径向力的重要原因;泵内压力和径向力均呈周期性脉动;叶轮内的压力脉动周期和主频与导叶的叶片数相关,导叶内的压力脉动周期和主频与叶轮叶片数相关,而两者的径向力脉动周期和主频则均与叶轮叶片数相关。
Considering that deep-sea lifting pump is the key equipment of deep-sea mining system, the internal flow is complex, and the radial force of the fluid can not be calculated theoretically by formulas, the experimental and numerical simulation methods were used to study the regular and the production mechanism. Firstly, the steady flow field in the pump was calculated. Then, the unsteady flow field in the pump was calculated, and the time-domain and frequency-domain diagrams of pressure and radial force in the pump were obtained. The results show that the simulated values of the external characteristic curve agree well with the experimental values, which verifies the feasibility of the numerical simulation method. The dynamic and static interference between the impeller and the guide vane is an important cause of pressure pulsation and unbalanced radial force in the pump. The pressure and radial force in the pump have periodic pulsation characteristics. The pressure pulsation period and the main frequency in the impeller are related to the number of vanes during the pressure pulsation period and the main frequency in the vane are related to the number of impeller blades. The radial force pulsation period and the main frequency of them are only related to the number of impeller blades.
Considering that deep-sea lifting pump is the key equipment of deep-sea mining system, the internal flow is complex, and the radial force of the fluid can not be calculated theoretically by formulas, the experimental and numerical simulation methods were used to study the regular and the production mechanism. Firstly, the steady flow field in the pump was calculated. Then, the unsteady flow field in the pump was calculated, and the time-domain and frequency-domain diagrams of pressure and radial force in the pump were obtained. The results show that the simulated values of the external characteristic curve agree well with the experimental values, which verifies the feasibility of the numerical simulation method. The dynamic and static interference between the impeller and the guide vane is an important cause of pressure pulsation and unbalanced radial force in the pump. The pressure and radial force in the pump have periodic pulsation characteristics. The pressure pulsation period and the main frequency in the impeller are related to the number of vanes during the pressure pulsation period and the main frequency in the vane are related to the number of impeller blades. The radial force pulsation period and the main frequency of them are only related to the number of impeller blades.
引文
[1]杨敏官,王兴宁,高波,等.离心泵内部非定常水力激励特性[J].排灌机械工程学报,2014,32(12):1023-1028.YANG Minguan,WANG Xingning,GAO Bo,et al.Unsteady hydrodynamic excitation characteristics in centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(12):1023-1028.
[2]袁建平,付燕霞,刘阳,等.基于大涡模拟的离心泵蜗壳内压力脉动特性分析[J].排灌机械工程学报,2010,28(4):310-314.YUAN Jianping,FU Yanxia,LIU Yang,et al.Analysis on pressure fluctuation within volute of centrifugal pump based on large eddy simulation[J].Journal of Drainage and Irrigation Machinery Engineering,2010,28(4):310-314.
[3]BARRIO R,FERNáNDEZ J,BLANCO E,et al.Estimation of radial load in centrifugal pumps using computational fluid dynamics[J].European Journal of Mechanics B:Fluids,2011,30(3):316-324.
[4]ZHANG Ning,YANG Minguan,GAO Bo,et al.Unsteady pressure pulsation and rotating stall characteristics in a centrifugal pump with slope volute[J].Advances in Mechanical Engineering,2014,2015,34(6):189-194.
[5]张忆宁,曹卫东,姚凌钧,等.不同叶片出口角下离心泵压力脉动及径向力分析[J].流体机械,2017,45(11):34-40.ZHANG Yining,CAO Weidong,YAO Lingjun,et al.Analysis on pressure fluctuation and radial thrust of centrifugal pump under different blade outlet angle[J].Fluid Machinery,2017,45(11):34-40.
[6]张宁,杨敏官,高波,等.低比转速离心泵压力脉动频谱特性的试验研究[J].工程热物理学报,2017,38(9):1872-1876.ZHANG Ning,YANG Minguan,GAO Bo,et al.Experimental study on pressure fluctuation spectrum characteristics of a low specific speed centrifugal pump[J].Journal of Engineering Thermophysics,2017,38(9):1872-1876.
[7]GUO S,OKAMOTO H.An experimental study on the fluid forces induced by rotor-stator interaction in a centrifugal pump[J].International Journal of Rotating Machinery,2007,9(2):135-144.
[8]江伟,李挺,王玉川,等.导叶式离心泵内部流场数值模拟与试验[J].农业机械学报,2017,48(9):121-128.JIANG Wei,LI Ting,WANG Yuchuan,et al.Numerical simulation and experiment of flow field in centrifugal pump with vane diffuser[J].Transactions of The Chinese Society of Agricultural Machinery,2017,48(9):121-128.
[9]GONZALEZ J,PARRONDO J,SANTOLARIA C,et al.Steady and unsteady radial forces for a centrifugal pump with impeller to tongue gap variation[J].Journal of Fluids Engineering,2006,128(3):454-462.
[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.Analysis on pressure fluctuation of radial diffusers in a multistage centrifugal pump[J].Journal of Central South University(Science and Technology),2014,45(9):3295-3300.
[11]马新华,冯琦,蒋小平,等.导叶叶片数对多级离心泵压力脉动的影响[J].排灌机械工程学报,2016,34(8):665-671.MA Xinhua,FENG Qi,JIANG Xiaoping,et al.Influence of guide vane blade number on pressure fluctuation in multistage centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering,2016,34(8):665-671.
[12]SHI Weidong,ZHOU Ling,LU Weigang,et al.Numerical simulation and experimental study of different stages deep-well centrifugal pump[J].Journal of Computational&Theoretical Nanoscience,2013,10(12):2897-2901.
[13]周岭,施卫东,陆伟刚,等.深井离心泵数值模拟与试验[J].农业机械学报,2011,42(3):69-73.ZHOU Ling,SHI Weidong,LU Weigang,et al.Numerical simulation and experiment on deep well centrifugal pump[J].Transactions of the Chinese Society of Agricultural Machinery,2011,42(3):69-73.
[14]王川,陆伟刚,施卫东,等.不锈钢冲压潜水井泵的数值计算与试验验证[J].江苏大学学报(自然科学版),2012,33(2):176-180.WANG Chuan,LU Weigang,SHI Weidong,et al.Numerical calculation and experimental verification of stainless steel stamping submersible well pump[J].Journal of Jiangsu University(Natural Science Edition),2012,33(2):176-180.
[15]邹伟生,李哲奂,陈爱黎.海洋采矿扬矿电泵的研究[J].中南大学学报(自然科学版),2011,42(增刊2):221-225.ZOU Weisheng,LI Zhehuan,CHEN Aili.Lifting motor pump in deep sea mining[J].Journal of Central South University(Science and Technology),2011,42(Suppl 2):221-225.
[16]李哲奂.扬矿电泵内流场数值模拟及性能预测[D].长沙:湖南大学机械与运载工程学院,2013:36-37.LI Zhehuan.Lifting motor pump's internal flow field numerical simulation and performance prediction[D].Changsha:Hunan University.College of Mechanical and Vehicle Engineering,2013:36-37.
[17]唐达生,阳宁,龚德文,等.深海采矿锰结核泵的试验研究[J].海洋工程,2015,33(4):101-107.TANG Dasheng,YANG Ning,GONG Dewen,et al.Experimental study of manganese nodules pump in deep-sea mining[J].The Ocean Engineering,2015,33(4):101-107.
[18]施卫东,徐燕,张启华,等.多级潜水泵内部压力脉动特性[J].排灌机械工程学报,2014,32(3):196-201.SHI Weidong,XU Yan,ZHANG Qihua,et al.Characteristics of pressure pulsation in multi-stage submersible pump[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(3):196-201.
[2]袁建平,付燕霞,刘阳,等.基于大涡模拟的离心泵蜗壳内压力脉动特性分析[J].排灌机械工程学报,2010,28(4):310-314.YUAN Jianping,FU Yanxia,LIU Yang,et al.Analysis on pressure fluctuation within volute of centrifugal pump based on large eddy simulation[J].Journal of Drainage and Irrigation Machinery Engineering,2010,28(4):310-314.
[3]BARRIO R,FERNáNDEZ J,BLANCO E,et al.Estimation of radial load in centrifugal pumps using computational fluid dynamics[J].European Journal of Mechanics B:Fluids,2011,30(3):316-324.
[4]ZHANG Ning,YANG Minguan,GAO Bo,et al.Unsteady pressure pulsation and rotating stall characteristics in a centrifugal pump with slope volute[J].Advances in Mechanical Engineering,2014,2015,34(6):189-194.
[5]张忆宁,曹卫东,姚凌钧,等.不同叶片出口角下离心泵压力脉动及径向力分析[J].流体机械,2017,45(11):34-40.ZHANG Yining,CAO Weidong,YAO Lingjun,et al.Analysis on pressure fluctuation and radial thrust of centrifugal pump under different blade outlet angle[J].Fluid Machinery,2017,45(11):34-40.
[6]张宁,杨敏官,高波,等.低比转速离心泵压力脉动频谱特性的试验研究[J].工程热物理学报,2017,38(9):1872-1876.ZHANG Ning,YANG Minguan,GAO Bo,et al.Experimental study on pressure fluctuation spectrum characteristics of a low specific speed centrifugal pump[J].Journal of Engineering Thermophysics,2017,38(9):1872-1876.
[7]GUO S,OKAMOTO H.An experimental study on the fluid forces induced by rotor-stator interaction in a centrifugal pump[J].International Journal of Rotating Machinery,2007,9(2):135-144.
[8]江伟,李挺,王玉川,等.导叶式离心泵内部流场数值模拟与试验[J].农业机械学报,2017,48(9):121-128.JIANG Wei,LI Ting,WANG Yuchuan,et al.Numerical simulation and experiment of flow field in centrifugal pump with vane diffuser[J].Transactions of The Chinese Society of Agricultural Machinery,2017,48(9):121-128.
[9]GONZALEZ J,PARRONDO J,SANTOLARIA C,et al.Steady and unsteady radial forces for a centrifugal pump with impeller to tongue gap variation[J].Journal of Fluids Engineering,2006,128(3):454-462.
[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.Analysis on pressure fluctuation of radial diffusers in a multistage centrifugal pump[J].Journal of Central South University(Science and Technology),2014,45(9):3295-3300.
[11]马新华,冯琦,蒋小平,等.导叶叶片数对多级离心泵压力脉动的影响[J].排灌机械工程学报,2016,34(8):665-671.MA Xinhua,FENG Qi,JIANG Xiaoping,et al.Influence of guide vane blade number on pressure fluctuation in multistage centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering,2016,34(8):665-671.
[12]SHI Weidong,ZHOU Ling,LU Weigang,et al.Numerical simulation and experimental study of different stages deep-well centrifugal pump[J].Journal of Computational&Theoretical Nanoscience,2013,10(12):2897-2901.
[13]周岭,施卫东,陆伟刚,等.深井离心泵数值模拟与试验[J].农业机械学报,2011,42(3):69-73.ZHOU Ling,SHI Weidong,LU Weigang,et al.Numerical simulation and experiment on deep well centrifugal pump[J].Transactions of the Chinese Society of Agricultural Machinery,2011,42(3):69-73.
[14]王川,陆伟刚,施卫东,等.不锈钢冲压潜水井泵的数值计算与试验验证[J].江苏大学学报(自然科学版),2012,33(2):176-180.WANG Chuan,LU Weigang,SHI Weidong,et al.Numerical calculation and experimental verification of stainless steel stamping submersible well pump[J].Journal of Jiangsu University(Natural Science Edition),2012,33(2):176-180.
[15]邹伟生,李哲奂,陈爱黎.海洋采矿扬矿电泵的研究[J].中南大学学报(自然科学版),2011,42(增刊2):221-225.ZOU Weisheng,LI Zhehuan,CHEN Aili.Lifting motor pump in deep sea mining[J].Journal of Central South University(Science and Technology),2011,42(Suppl 2):221-225.
[16]李哲奂.扬矿电泵内流场数值模拟及性能预测[D].长沙:湖南大学机械与运载工程学院,2013:36-37.LI Zhehuan.Lifting motor pump's internal flow field numerical simulation and performance prediction[D].Changsha:Hunan University.College of Mechanical and Vehicle Engineering,2013:36-37.
[17]唐达生,阳宁,龚德文,等.深海采矿锰结核泵的试验研究[J].海洋工程,2015,33(4):101-107.TANG Dasheng,YANG Ning,GONG Dewen,et al.Experimental study of manganese nodules pump in deep-sea mining[J].The Ocean Engineering,2015,33(4):101-107.
[18]施卫东,徐燕,张启华,等.多级潜水泵内部压力脉动特性[J].排灌机械工程学报,2014,32(3):196-201.SHI Weidong,XU Yan,ZHANG Qihua,et al.Characteristics of pressure pulsation in multi-stage submersible pump[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(3):196-201.