吴贤芳,刘厚林,谈明高,崔建保,丁 剑.离心泵关死点内部流动数值模拟[J].农业机械学报,2013,44(11):48-52. Wu Xianfang,Liu Houlin,Tan Minggao,Cui Jianbao,Ding Jian.Numerical Simulation for Centrifugal Pump at Shut-off Condition[J].Transactions of the Chinese Society for Agricultural Machinery,2013,44(11):48-52.
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摘要点击次数: 3537 全文下载次数: 1598
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离心泵关死点内部流动数值模拟 [下载全文] |
Numerical Simulation for Centrifugal Pump at Shut-off Condition [Download Pdf][in English] |
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DOI:10.6041/j.issn.1000-1298.2013.11.009 |
中文关键词: 离心泵 关死点 全流场 非定常 数值模拟 |
基金项目:国家自然科学基金资助项目(51109095、51079062、51179075、51239005)、国家高技术研究发展计划(863计划)资助项目(2011AA100506)、江苏省产学研项目(BY2011140)和江苏高校优势学科建设工程资助项目 |
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中文摘要:采用非定常雷诺时均方法结合SST湍流模型,对一比转数为86.44的离心泵零流量工况下的内部流动进行了三维全流场数值模拟。基于数值模拟结果,预测了离心泵关死点扬程并与试验结果进行了比较,同时分析了关死点内部流动规律。研究结果表明,CFD预测的关死点平均扬程误差为4.7%;流道1的进口和出口各有一个旋转方向相反的漩涡,2个漩涡在一个周期内会各自发生不同的状态改变,且呈现明显的周期变化;蜗壳扩散段的绝对速度接近于零,流道1内叶片工作面的高速区面积先增加后减小;蜗壳内的静压分布变化明显,流道1的工作面出口处高压区面积随着叶轮的旋转不断减小;泵进口始终存在着6个大小不同的漩涡,且这6个漩涡基本堵塞了整个流道。 |
Wu Xianfang Liu Houlin Tan Minggao Cui Jianbao Ding Jian |
Jiangsu University;Jiangsu University;Jiangsu University;Jiangsu University;Jiangsu University |
Key Words:Centrifugal pump Shut-off condition Whole flow field Unsteady flow Numerical simulation |
Abstract:The unsteady full flow fields at shut off condition in a centrifugal pump with specific-speed of 86.44 were simulated by unsteady Reynolds averaged Navier-Stokes approach and SST model. The head of the pump at SOC was predicted based on CFD results. Through the comparison and analyses, it was concluded that the average head prediction errors was 4.7% compared with test result. There were two eddies in impeller flow passage No.1 and the rotation direction was opposite. The velocity at volute diffusion part was very small. The high speed area of the pressure surface in impeller flow passage No.1 increased first and then decreased. The pressure distribution in the volute changes evidently, and the high pressure area of the pressure surface in impeller flow passage No.1 at the exit area constantly decrease as the impeller rotates. There are always six different sizes of vortexes at the impeller inlet and the vortexes nearly block the whole impeller passage. |
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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