Study on internal flow characteristic in High-speed Centrifugal Pumps Under Condition of Whirl

PDF(2315 KB)

Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (11) : 87-92.

Yuan Jianping1,Shen Chendong1,Liu jun2,Fu yanxia1,Zhou banglun1

Author information +

History +

Abstract

Among the most factors causing the vibration of the high-speed pumps, one is the whirling motion of the impellers which rotate in an eccentric way with the interaction of the fluid force acting. In order to investigate its internal flow, a high-speed centrifugal pump was simulated based on the research scheme consist of three different flow rates, four different eccentricities and six different whirl frequency ratios by using the commercial software CFX. In addition, the effect of whirl frequency ratio, flow rate and eccentricity on internal flow of high-speed pump was also studied. The results show that: The low pressure area in inlet of impeller are minimum at the design point while eccentricity is close to zero; Under the condition of low flowrate, the number of vortex increased as the whirl frequency decreased when whirl frequency is negative; Under the condition of high flowrate, the number of vortex increased as the eccentricity increased when whirl frequency is negative; The tangential force Ft is weakly dependent on the eccentricities and whirl frequency ratios, while the component force direction on x-axis、y-axis、z-axis changes as the flow rate changes.

Key words

High-speed centrifugal pump / Numerical analysis / flow Field analysis / Fluid forces / whirl frequency ratio

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

Yuan Jianping1,Shen Chendong1,Liu jun2,Fu yanxia1,Zhou banglun1 . Study on internal flow characteristic in High-speed Centrifugal Pumps Under Condition of Whirl[J]. Journal of Vibration and Shock, 2016, 35(11): 87-92

References

[1] 陈林华．不对中转子系统振动特征分析与诊断[J]．压缩机技术，2003，10（6）：16～18．
Chen Linhua．Analysis and diagnosis to the vibration
characteristic of non-concentric rotor system[J]．
Compressor Technology，2003，10（6）：16～18．(in Chinese)
[2] Fu Yanxia，Yuan Jianping，Yuan Shouqi，et al．Numerical and Experimental Analysis of flow Phenomena in a Centrifugal Pump Operating Under Low Flow Rates[J]．ASME J．Fluids Eng，2014，137(1)：1~12 ．
[3] 徐龙祥．高速旋转轴系动力学设计[M]．北京：国防工业出版社，1994：72．
Xu longxiang．The dynamic design of high speed rotating shaft[M]．Beijin：National defence industrial press，1994：72．(in Chinese)
[4] KauPert K A，Staubli T．The unsteady pressure field in a high specific speed centrifugal Pump impeller-partⅠ：influence of the volute[J]．ASME J．Fluids Eng，1999，121(9)：621～626．
[5] KauPert K A，Staubli T．The unsteady pressure field in a high specific speed centrifugal Pump impeller-partⅡ：influence of the volute[J]．ASME J．Fluids Eng，1999，121(9)：627～632．
[6] 张德胜，汪靖，施卫东等．高压多级离心泵转子系统的不平衡相应特性[J]．排灌机械工程学报，2014，32（1）：17~22．
Zhang desheng，Wang jing，Shi weidong，et al．Unbalance response characteristics of rotor system in high pressure multi-stage pump[J]．Drainage and Irrigation Machinery，2014，32（1）：17~22．(in Chinese)
[7] Vance J M．Rotor dynamics of turbomachinery[M]．New York：John Wiley and Sons，1988
[8] 杨永锋，任兴民，徐斌．国外转子动力学研究综述[J]．机械科学与技术，2011，30（10）：1775～1781．
Yang yongfen，Ren xingming，Xu bing．Review of
International Research on Rotor Dynamics[J]．Mechanical Science and Technology for Aerospace Engineering．2011，30（10）：1775～1781．(in Chinese)
[9] 缪红燕，高金吉，徐鸿．转子系统瞬态不平衡响应的有限元分析[J]．振动与冲击，2004，23(3)：1~5．
Miao Hongyan，Gao Jinji，Xu Hong．Transient response of unbalanced rotor system through its critical speed[J]．Journal of Vibration and Shock， 2004， 23 (3) ：1~5． ( in Chinese)
[10] CHEW C S， YEO K S，SHU C．A generalized finite difference(GFD) ALE scheme for incompressible flows around moving solid bodies on hybrid meshfrss Cartesian grids[J]．Journal of Computational Physics，2006，218(2)：510～548．
[11] 曹卫东，高一，王秀兰等．基于Ansys的矿用潜水电泵转子系统的优化设计[J]．排灌机械工程学报，2012，30（2）：157~163．
Cao Weidong，Gao Yi，Wang xiulan，et al．Optization design of submersible pump rotor system for coal mine mine base on Ansys．Drainage and Irrigation Machinery，2012，30（2）：157~163．
[12] 李同杰，孙启国，王娟．横向流体激振力作用下的不平衡离心叶轮转子分岔特性研究[J]．振动与冲击， 2007，26(4)：144~146．
Li Tongjie，Sun Qiguo，Wangjuan．Study on the unbalanced centrifugal impeller rotor under lateral fluid force[J]．Journal of Vibration and Shock，2007，26(4)：144~146．