刘建瑞,文海罡,向宏杰,郭晨旭,高振军.导流器对射流式自吸离心泵自吸性能的影响[J].农业机械学报,2013,44(1):43-47.
Liu Jianrui,Wen Haigang,Xiang Hongjie,Guo Chenxu,Gao Zhenjun.Effects of Diffuser on Self-priming Performance of Flow-ejecting Self-priming Centrifugal Pump[J].Transactions of the Chinese Society for Agricultural Machinery,2013,44(1):43-47.
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导流器对射流式自吸离心泵自吸性能的影响   [下载全文]
Effects of Diffuser on Self-priming Performance of Flow-ejecting Self-priming Centrifugal Pump   [Download Pdf][in English]
  
DOI:10.6041/j.issn.1000-1298.2013.01.009
中文关键词:  自吸离心泵  导流器  隔流板  自吸性能  数值模拟
基金项目:国家高技术研究发展计划(863计划)资助项目(2011AA100506)
作者单位
刘建瑞 江苏大学 
文海罡 江苏大学 
向宏杰 江苏大学 
郭晨旭 江苏大学 
高振军 江苏大学 
中文摘要:在射流式自吸离心泵的叶轮出口处增设新型导流器,该导流器具有两个不对称出口及隔流板,隔流板与叶轮间隙为1.0mm。基于Fluent软件提供的Mixture多相流模型、标准k—ε湍流模型及SIMPLE算法,对该泵的自吸过程进行了非定常数值模拟,得到了泵内压力、速度和气液两相分布及导流器两个出口的压力、气相体积流率和液相质量流率随时间步长的变化规律。结果表明:导流器内压力沿流体流动方向逐渐增大,并出现较大的变化梯度,叶轮各流道内的压力近似对称分布;导流器两个不对称出口气液混合物的各个流动参数呈规律的周期性变化;导流器上的隔流板与叶轮的间隙在泵自吸过程中不仅能阻止液体环流,减少水力损失,而且使泵加速气液的混合及分离,从而缩短泵的自吸时间。
Liu Jianrui  Wen Haigang  Xiang Hongjie  Guo Chenxu  Gao Zhenjun
Jiangsu University;Jiangsu University;Jiangsu University;Jiangsu University;Jiangsu University
Key Words:Self-priming centrifugal pump  Diffuser  Separating flow board  Self-priming performance  Numerical simulation
Abstract:A type of diffuser which had two asymmetrical exits and a separating flow board was placed at the inlet of the impeller of flow-ejecting self-priming centrifugal pump. The gap between the separating flow board and the impeller was 1.0mm. Based on Mixture multiphase flow model, the standard k—ε turbulence model and SIMPLE algorithm, unsteady numerical simulation of the self-priming process was carried out by using Fluent software. The distributions of pressure, velocity and gas-liquid phases field inside the pump, and also the changing regularity of pressure, gas phase volume flow rate and liquid mass flow rate on the two exits of the diffuser with the change of timestep were obtained. The results show that the pressure in the diffuser gradually increases along the direction of flow and appears larger change gradient, the pressure inside the each runner of the impeller approximate symmetric distribution.The flow parameters appear periodic change on the two asymmetrical exits of the diffuser. The gap between the separating flow board and impeller have not only prevented the formation of circulation of the fluid, reducing hydraulic loss and improving the efficiency of the pump, but also quicken the mixing of the gas-liquid near the gap, shortening the self-priming time of the pump.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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