朱荣生,欧鸣雄.低比转数双吸离心泵回流问题的CFD研[J].农业机械学报,2009,40(4):82-85.
.of Reverse Flow in Low Specific Speed Double Suction Centrifugal Pump[J].Transactions of the Chinese Society for Agricultural Machinery,2009,40(4):82-85.
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低比转数双吸离心泵回流问题的CFD研   [下载全文]
of Reverse Flow in Low Specific Speed Double Suction Centrifugal Pump   [Download Pdf][in English]
  
DOI:10.3969/j.issn.1000-1298.[year].[issue].[sequence]
中文关键词:  双吸离心泵  回流  流场测试  探针  模拟
基金项目:
朱荣生  欧鸣雄
江苏大学
中文摘要:针对某低比转数双吸离心泵在小流量工况下出现回流的问题,利用CFD技术对双吸泵及吸水室内部流场进行数值模拟研究,并提出定点速度值分析法,模拟流场测试试验中采用的动态探针采样测试系统,对回流问题进行研究。通过对叶轮进口相应测试点在不同流量下的速度变化进行统计分析,发现其变化规律和理论分析结果与以往文献中试验总结的规律变化一致。并根据曲线变化及理论分析结果,提出回流诱发流量点、回流稳定流量点、回流变化区间的概念。并在理论分析基础上,提出叶轮进口回流区有效厚度值的定义及预估方法。
Key Words:
Abstract:Aiming at the problem of reverse flow which occurred under low flow rate in a low specific speed double suction centrifugal pump, the inner flow of pump and suction chambers were simulated, velocity analysis of fixed-points which was proposed to simulate probe-sampling system in experiment was used in reverse-flow research. After the statistics and analysis of velocity changes of fixed-point in the inlet of impeller in different flow rates, it was found that the curve got from simulation accord with the theory analysis and experimental curve in other literature. Based on the analysis of curve, reverse occur flow rate, reverse stable flow rate and reverse flow range were defined and explained. A new method which was used to predict the effective thickness of reverse flow field according to theory analysis was proposed.

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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