Calculation of throat pipe length in CP type jet pump based on numerical simulation
GU Qing-chun1, YU Zhi-jun2, WANG Feng-jing3, LONG Xin-ping3
1.Navy Representative Section at 704 Research Institute, Shanghai 200031, China; 2.Navy University of Engineering, Wuhan, Hubei 430033, China; 3.School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China
Abstract：Based on SIMPLE algorithm and RNG k-ε turbulence model,numerical simulation was carried out to calculate the inner flow field of the CP type jet pump with throat pipe of different lengths.By comparison and analysis on their performance and inner flow field,it was found that the throat pipe lengths has important effect on the performance,the pressure distribution as well as the inner flow field of the jet pump.Regardless of cavitation,with the length of throat pipe in the range of(2.5~6.0) times of throat diameter,the peak efficiency will also increase and the point of peak efficiency will move to the right to the larger flow rate ratio region.By analysis of the efficiency,the kinetic energy correction coefficient α and the momentum correction coefficient α′ at the throat outlet section together with the pressure distribution,it revealed that in the range of(3.7~4.5) times of throat diameter,the jet pump performs best in the design duty point,which must be the optimal length of throat pipe for the CP jet pump.
顾青春；俞志君；王丰景；龙新平. 基于数值模拟的CP型喷射泵喉管长度计算[J]. 排灌机械工程学报, 2008, 26(5): 34-37.
GU Qing-chun, YU Zhi-jun, WANG Feng-jing, LONG Xin-ping. Calculation of throat pipe length in CP type jet pump based on numerical simulation. Journal of Drainage and Irrigation Machinery Engin, 2008, 26(5): 34-37.
[1] Winoto S H,Li H,Shah D A.Efficiency of jet pumps[J].Journal of Hydraulic Engineering,2000,126(2):150-156[2] 龙新平,朱劲木,梁爱国.射流泵喉管最优长度的数值计算[J].水利学报,2003(10):14-18[3] 朱劲木,梁爱国,龙新平.射流泵性能的数值计算[J].武汉大学学报(工学版),2002,35(6):7-10[4] 龙新平,程茜,韩宁.射流泵最佳喉嘴距的数值模拟[J].核动力工程,2008,29(1):35-38[5] Karassik I J,Messina J P,Cooper P.Pump Handbook[M].New York:McGraw-Hill,2001:1-4,30[6] Zhu Jinmu,Han Ning,Long Xinping.Three-dimensional numerical simulation on flow field within a jet pump[A].合肥:合肥理工大学出版社,2005:427-435[7] 陆宏圻,龙新平,朱劲木.喷射技术理论及应用[M].武汉:武汉大学出版社,2004[8] 王福军,黎耀军,王文娥.水泵CFD应用中的若干问题与思考[J].排灌机械,2005,23(5):1-10
