In order to study the characters of self-priming irrigation pumps′ jet nozzles,fluid mechanics principles were used to derive the resistance coefficients and flow coefficients of self-priming irrigation pump.Four different jet nozzles were designed.By calculating the resistance coefficients and flow coefficients,change laws of coefficients with different outlet diameters were obtained.Four self-priming irrigation pumps with four jet nozzles were tested by the test-bed.Combined with the results of experiments and change laws of coefficients,the influences of resistance coefficients and flow coefficients on self-priming capability were studied.The results show that resistance coefficients decrease and flow coefficient increase with the increasing jet nozzle outlet diameters.At the same time,self-priming time was shortened.But the self-priming capability deteriorates with the weakening of jet entrainment effect in certain extent.
LI Hong, Shen-Zhen-Hua, Liu-Jian-Rui et al. Derivation and experiments for jet nozzles′ coefficients of self-priming irrigation pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2009, 27(4): 228-231.
刘建瑞,周贵平,施卫东,等.新型高效自吸喷灌泵的设计与试验[J].排灌机械,2006,24(4):1-4.Liu Jianrui,Zhou Guiping,Shi Weidong,et al.Design and test of self-priming and flow-ejecting spray pump[J].Drainage and Irrigation Machinery,2006,24(4):1-4.(in Chinese)
刘建瑞,施卫东,叶忠明,等.离心泵射流自吸装置的研究[J].农业工程学报,2006,22(1):89-92.Liu Jianrui,Shi Weidong,Ye Zhongming,et al.Jetted self-priming set for the centrifugal pump[J].Transactions of the CSAE,2006,22(1):89-92.(in Chinese)
施卫东,叶忠明,刘建瑞,等.一种新型射流式自吸泵进口流场的数值模拟[J].农业机械学报,2006,35(10):50-52.Shi Weidong,Ye Zhongming,Liu Jianrui,et al.Numerical simulation of in let flow of new-jetted self-priming pump[J].Transactions of the Chinese Society for Agricultural Machinery,2006,35(10):50-52.(in Chinese)
Falcone,Anthony M.Entrainment velocity in an axisymmetric turbulent jet[J].Journal of Fluid Engineering,2003,125(4):620-627.
刘成文,李兆敏.锥形喷嘴流量系数及水力参数的理论计算方法[J].钻采工艺,2000,23(5):1-3.Liu Chengwen,Li Zhaomin.A theoretical calculation method for flow rate coefficient and hydraulic parameters of conical nozzle[J].Drilling ＆ Production Technology,2000,23(5):1-3.(in Chinese)
刘建瑞,周贵平,施卫东,等.轻小型射流式自吸喷灌泵设计与研究[J].水泵技术,2006(3):1-4.Liu Jianrui,Zhou Guiping,Shi Weidong,et al.Design and research of smart-jetted self-priming irrigation pump[J].Pump Technology,2006(3):1-4.(in Chinese)