摘要 利用三维造型软件创建了50ZB-25D型射流式自吸喷灌泵的内部全流场,运用FLUENT软件计算了该泵在3种情况,即回流阀完全关阀、不使用回流阀、回流阀完全关阀但不考虑分离室和储液室的影响等情况下的效率,探讨了回流阀、分离室和储液室对泵效率的影响.为了验证运用FLUENT计算射流式自吸喷灌泵效率的准确性,对该泵做了效率试验.运用FLUENT软件提供的M ixture两相流模型,对泵自吸过程中的气液两相流进行了非定常计算,探讨了自吸过程中泵体内气液两相流流动规律.结果表明,回流阀对泵效率的影响很大,而分离室和储液室结构的复杂性并不会产生大的影响;数值模拟结果与试验结果的吻合度较高,效率在各个流量点下相差不超过3%,扬程相差不超过1.5 m.
Abstract： In order to study the effect of the valve and outer pump casing on self-priming irrigation pump efficiency,the inner flow model of 50ZB-25D self-priming irrigation pump was built by three-dimensio-nal modeling software,and the pump efficiency was calculated by FLUENT software under three different conditions:recycling valve closed,recycling valve not used,recycling valve closed but the influence of outer pump casing ignored.To verify the calculation accuracy of pump efficiency with FLUENT,the pump efficiency was tested experimentally.To further study gas-liquid two-phase flow in the pump self-priming process,three-dimensional simulation was performed for the gas-liquid two-phase unsteady turbulent flow by using FLUENT software with Mixture model.The results indicate that the valve has great influence on the self-priming irrigation pump efficiency,but the complexity of the outer pump casing structure has little effect.The numerical results agree favorably with the experimental data with discreparcies less than 3% in efficiency and less than 1.5 meters in head.
[1]雷桥,包海蓉.自吸泵内气液两相流分析及数学模式[J].上海水产大学学报,2002,11(2):149-153.Lei Qiao,Bao Hairong.An anlysis and mathematical model on two-phase flow of gas-liquid in self-priming pump[J].Journal of Shanghai Fisheries University,2002,11(2):149-153.(in Chinese)[2]卢金铃,席光,祁大同.气液两相流泵的研究进展[J].流体机械,2001,29(12):12-15.Lu Jinling,Xi Guang,Qi Datong.Review of research on gas-liquid two-phase flow pumps[J].Fluid Machi-nery,2001,29(12):12-15.(in Chinese)[3]刘建瑞,滕人博,施卫东,等.轻小型射流式自吸喷灌泵设计方法[J].排灌机械,2008,26(1):6-9.Liu Jianrui,Teng Renbo,Shi Weidong,et al.Design and method for light and small flow-ejecting self-priming spray pumps[J].Drainage and Irrigation Machinery,2008,26 (1):6-9.(in Chinese)[4]江帆,黄鹏.Fluent高级应用与实例分析[M].北京:清华大学出版社,2008:250-262.[5]关醒凡.现代泵技术手册[M].北京:宇航出版社,1995:444-452.[6]Poullikkas A.Effects of two-phase liquid-gas flow on the performance of nuclear reactor cooling pumps[J].Progress in Nuclear Energy,2003,1(42):3-10.[7]Poullikkas A.Compressibility and condensation effects when pumping gas-liquid mixtures[J].Fluid Dynamics Research,1999,25(2):57-62.[8]李清平,卢文强,薛敦松.流体机械转轮内气泡运动轨迹的数值分析[J].中国海上油气(工程),2000,12(2):48-54.Li Qingping,Lu Wenqiang,Xue Dunsong.Three dimensional numerical analysis of bubbles′ trajectories inside a turbo-machinery impeller[J].China Offshore Oil and Gas(Engineering),2000,12(2):48-54.(in Chinese)[9]Caridad J,Asuaje M,Kenyey F,et al.Characterization of a centrifugal pump impeller under two-phase flow conditions[J].Journal of Petroleum Science and Enginee-ring,2008,63(1-4):18-22.[10]王春林,吴志旺,司艳雷,等.旋流自吸泵气液两相流数值模拟[J].排灌机械,2009,27(3):163-167.Wang Chunlin,Wu Zhiwang,Si Yanlei,et al.Gas-liquid two-phase flow numerical simulation of a vortex flow self-priming pump[J].Drainage and Irrigation Machi-nery,2009,27(3):163-167.(in Chinese)
