旋涡泵内纵向旋涡影响机理分析
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摘要
为进一步研究旋涡泵内部流场特点,阐述旋涡内纵向旋涡对旋涡泵外特性的影响机理,本文通过试验测得某旋涡泵的流量-扬程特性曲线,并与数值计算结果相对比,验证SST k-ω湍流模型应用于旋涡泵数值计算中的准确性;通过分析6个轴向截面和15个周向截面的流场特征,研究纵向旋涡的形成和消失与压力速度变化的联系。结果表明:旋涡泵内可分为进口区、加速区、线性区、减速区、出口区和隔舌区;旋涡泵叶轮与流道的动量交换不仅仅发生在叶根和叶尖区域;线性区内纵向旋涡周期性的产生与消失使流体压力升高了总压升的85.7%;出口区和隔舌区内纵向旋涡的消失使进口区压力突降了35%,隔舌区速度突降了60%。
In order to further study the characteristics of internal flow field of vortex pump,the influence mechanism of longitudinal vortex in the vortex pump on external characteristics of the pump was described. This paper compared the mass flow —head characteristic curve of a vortex pump measured through test with the numerical simulation results,and proved accuracy of application of SST k-ω turbulence model in numerical simulation of the vortex pump. Through the analysis of characteristics of 6 axial sections and 15 circumferential sections of the flow field in the vortex pump,the relationship between vertical vortex formation and disappearance and changes in pressure and velocity.The results show that the space in the vortex pump can be divided into the inlet zone,acceleration zone,linear zone,deceleration zone,exit zone and cut-water zone;Momentum exchange between the impeller and the flow passage not merely occurred in the blade root and blade tip area; Periodic generation and disappearance of longitudinal vortexes in the linear zone made the fluid pressure increased by 85.7% of the total pressure rise;And disappearance of the longitudinal vortexes in exit zone and cut-water zone made the pressure in the inlet zone suddenly reduced by 35%,and made the velocity in cut-water zone reduced by 60%.
In order to further study the characteristics of internal flow field of vortex pump,the influence mechanism of longitudinal vortex in the vortex pump on external characteristics of the pump was described. This paper compared the mass flow —head characteristic curve of a vortex pump measured through test with the numerical simulation results,and proved accuracy of application of SST k-ω turbulence model in numerical simulation of the vortex pump. Through the analysis of characteristics of 6 axial sections and 15 circumferential sections of the flow field in the vortex pump,the relationship between vertical vortex formation and disappearance and changes in pressure and velocity.The results show that the space in the vortex pump can be divided into the inlet zone,acceleration zone,linear zone,deceleration zone,exit zone and cut-water zone;Momentum exchange between the impeller and the flow passage not merely occurred in the blade root and blade tip area; Periodic generation and disappearance of longitudinal vortexes in the linear zone made the fluid pressure increased by 85.7% of the total pressure rise;And disappearance of the longitudinal vortexes in exit zone and cut-water zone made the pressure in the inlet zone suddenly reduced by 35%,and made the velocity in cut-water zone reduced by 60%.
引文
[1]周文彬,杨敏官,张杰.旋涡泵的现状与发展方向浅析[J].水泵技术,2007(6):1-3.
[2]袁丹青,王冠军,陈向阳,等.旋涡泵的研究现状与展望[J].排灌机械,2008(6):63-68.
[3]陈万强,李祥阳,郭文君,等.航空旋涡泵的研究现状及发展方向[J].机械制造,2012,50(8):54-55.
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[6]Iversen H W.Performance of the periphery pump[J].Trans.ASME,1955(77):19-28.
[7]Song J W,Engeda A,Chung M K.A modified theory for the flow mechanism in a regenerative flow pump[J].Proceedings of the Institution of Mechanical Engineers Part A Journal of Power&Energy,2003,217(3):311-321.
[8]Meakhail T,Park S O.An improved theory for regenerative pump performance[J].Proceedings of the Institution of Mechanical Engineers Part A Journal of Power&Energy,2005,219(3):213-222.
[9]Nejadrajabali J,Riasi A,Nourbakhsh SA.Flow pattern analysis and perfor-mance improvement of regenerative flow pump using blade geometry modification[J].International Journal of Rotating Machinery,2016(77):1-16.
[10]Francis Q,Thomas S,Matthew S.Design optimisation of a regenerative pump using numerical and experimental techniques[J].International Journal of Numerical Methods for Heat&Fluid Flow,2011,21(1):95-111.
[11]施卫东,董颖,马新华,等.流道截面形状对旋涡泵内部流动影响的数值模拟[J].农业工程学报,2005(3):21-23.
[12]董颖,施卫东,汪永志.旋涡泵的内部流动研究[J].水泵技术,2004(1):18-19.
[13]沙毅.旋流泵性能及内部流场试验分析[J].农业工程学报,2011(4):141-146.
[14]赵万勇,马鹏飞,张凡,等.基于正交法的旋涡泵结构优化[J].甘肃科学学报,2011(3):76-80.
[15]Mason S C.Influence of internal geometry upon regenerative pump performance[J].Massachusetts Institute of Technology,1957.
[16]沙毅,李金磊,李昌烽.自吸旋涡泵内部流动分析[J].排灌机械,2008(6):10-14.
[17]沙毅.旋涡泵内部流动分析及水力设计[J].流体机械,2016,44(12):29-32.
[18]王秀勇,黎义斌,毕祯,等.多级旋涡泵内部流动特性与压力脉动的数值分析[J].排灌机械工程学报,2016,34(10):853-859.
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[2]袁丹青,王冠军,陈向阳,等.旋涡泵的研究现状与展望[J].排灌机械,2008(6):63-68.
[3]陈万强,李祥阳,郭文君,等.航空旋涡泵的研究现状及发展方向[J].机械制造,2012,50(8):54-55.
[4]Crewdson E.Water-ring self-priming pumps[J].Proceedings of the Institution of Mechanical Engineers,1956,170(2):407-425.
[5]Wilson W A,Santalo M A,Oelrich J A.A theory of the fluid-dynamic mechanism of regenerative pumps[J].Trans.ASME,1955(77):1303-1316.
[6]Iversen H W.Performance of the periphery pump[J].Trans.ASME,1955(77):19-28.
[7]Song J W,Engeda A,Chung M K.A modified theory for the flow mechanism in a regenerative flow pump[J].Proceedings of the Institution of Mechanical Engineers Part A Journal of Power&Energy,2003,217(3):311-321.
[8]Meakhail T,Park S O.An improved theory for regenerative pump performance[J].Proceedings of the Institution of Mechanical Engineers Part A Journal of Power&Energy,2005,219(3):213-222.
[9]Nejadrajabali J,Riasi A,Nourbakhsh SA.Flow pattern analysis and perfor-mance improvement of regenerative flow pump using blade geometry modification[J].International Journal of Rotating Machinery,2016(77):1-16.
[10]Francis Q,Thomas S,Matthew S.Design optimisation of a regenerative pump using numerical and experimental techniques[J].International Journal of Numerical Methods for Heat&Fluid Flow,2011,21(1):95-111.
[11]施卫东,董颖,马新华,等.流道截面形状对旋涡泵内部流动影响的数值模拟[J].农业工程学报,2005(3):21-23.
[12]董颖,施卫东,汪永志.旋涡泵的内部流动研究[J].水泵技术,2004(1):18-19.
[13]沙毅.旋流泵性能及内部流场试验分析[J].农业工程学报,2011(4):141-146.
[14]赵万勇,马鹏飞,张凡,等.基于正交法的旋涡泵结构优化[J].甘肃科学学报,2011(3):76-80.
[15]Mason S C.Influence of internal geometry upon regenerative pump performance[J].Massachusetts Institute of Technology,1957.
[16]沙毅,李金磊,李昌烽.自吸旋涡泵内部流动分析[J].排灌机械,2008(6):10-14.
[17]沙毅.旋涡泵内部流动分析及水力设计[J].流体机械,2016,44(12):29-32.
[18]王秀勇,黎义斌,毕祯,等.多级旋涡泵内部流动特性与压力脉动的数值分析[J].排灌机械工程学报,2016,34(10):853-859.
[19]Ansys C.Solver Theory Guide,Ansys Inc[M].2015.
[20]Habeeb L J.ANSYS 13.0 Help,FLUENT Theory Guide[M].2013.
[21]Durbin P A.Separated flow computations with the kepsilon-v(sup 2)model[J].Aiaa Journal,1995,33:659-664.
[22]关醒凡.现代泵技术手册[M].北京:宇航出版社,1995.