动静叶相互作用对离心泵空化特性影响的数值分析
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摘要
为研究离心泵旋转过程中的空化特性,以实验室的小流量离心泵为基础建立三维模型,采用Rayleigh-Plesset空化模型和Transient Blade Row模型对离心泵进行瞬态空化计算,分析旋转角变化时其空化体积分数变化情况。结果表明,当旋转角度为8°左右时,空化体积分数最小,扬程最高;当旋转角度为40°左右时,空化体积分数最大,扬程最低;当旋转角度为120°左右时,叶片的载荷存在较大值。
In order to study the cavitation characteristics of centrifugal pump during rotation,taking one centrifugal pump with small flow in laboratory as a basis,the three-dimensional model is established.The Rayleigh-Plesset cavitation model and Transient Blade Row model are used for transient calculation of cavitation of centrifugal pump,and analyzing the cavitation volume fraction variation when the rotation angle changes.The results show that when the rotation angle is around 8 degrees,the cavitation volume fraction gets to a minimum,and the lift is highest;when the rotation angle is around 40 degrees,the cavitation volume fraction gets to a maximum,and the lift is the lowest;when the rotation angle is around 120 degrees,the load of the blade has a larger value.
In order to study the cavitation characteristics of centrifugal pump during rotation,taking one centrifugal pump with small flow in laboratory as a basis,the three-dimensional model is established.The Rayleigh-Plesset cavitation model and Transient Blade Row model are used for transient calculation of cavitation of centrifugal pump,and analyzing the cavitation volume fraction variation when the rotation angle changes.The results show that when the rotation angle is around 8 degrees,the cavitation volume fraction gets to a minimum,and the lift is highest;when the rotation angle is around 40 degrees,the cavitation volume fraction gets to a maximum,and the lift is the lowest;when the rotation angle is around 120 degrees,the load of the blade has a larger value.
引文
[1]WANG J,WANG Y,LIU H L,et al.An improved turbulence model for predicting unsteady cavitating flows in centrifugal pump[J].International Journal of Numerical Methods for Heat&Fluid Flow,2015,25(5):1198-1213.
[2]ZHANG D S,SHI W,PAN D,et al.Numerical and experimental investigation of tip leakage vortex cavitation patterns and mechanisms in an axial flow pump[J].ASME Journal of Fluids Engineering,2015,137(12):121103-1-121103-14.
[3]ZHANG D S,SHI W D.Study on unsteady tip leakage vortex cloud cavitation in an axial flow pump using an improved numerical method[C]∥ASME-JSME-KSMEJoint Fluids Engineering Conference.2015:14.
[4]张建华,楚武利,马文瑛.离心泵的叶片进口几何形状对泵汽蚀性能的影响[J].流体机械,2012(8):36-39.
[5]谢山峰.开缝叶片对低比转速离心泵性能影响的研究[D].镇江:江苏大学,2016:61-63.
[6]赵立峰.射流式离心泵内部流动及空化特性研究[D].镇江:江苏大学,2016:57-63.
[2]ZHANG D S,SHI W,PAN D,et al.Numerical and experimental investigation of tip leakage vortex cavitation patterns and mechanisms in an axial flow pump[J].ASME Journal of Fluids Engineering,2015,137(12):121103-1-121103-14.
[3]ZHANG D S,SHI W D.Study on unsteady tip leakage vortex cloud cavitation in an axial flow pump using an improved numerical method[C]∥ASME-JSME-KSMEJoint Fluids Engineering Conference.2015:14.
[4]张建华,楚武利,马文瑛.离心泵的叶片进口几何形状对泵汽蚀性能的影响[J].流体机械,2012(8):36-39.
[5]谢山峰.开缝叶片对低比转速离心泵性能影响的研究[D].镇江:江苏大学,2016:61-63.
[6]赵立峰.射流式离心泵内部流动及空化特性研究[D].镇江:江苏大学,2016:57-63.