张 华,陈 斌,施卫东,徐焰栋,王 震.低比转数排污泵数值计算与实验[J].农业机械学报,2013,44(11):78-81.
Zhang Hua,Chen Bin,Shi Weidong,Xu Yandong,Wang Zhen.Numerical Simulation and Experimental Research on Low-specific-speed Sewage Pump[J].Transactions of the Chinese Society for Agricultural Machinery,2013,44(11):78-81.
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低比转数排污泵数值计算与实验   [下载全文]
Numerical Simulation and Experimental Research on Low-specific-speed Sewage Pump   [Download Pdf][in English]
  
DOI:10.6041/j.issn.1000-1298.2013.11.014
中文关键词:  排污泵 低比转数 蜗壳 数值计算 PIV
基金项目:“十二五”国家科技支撑计划资助项目(2011BAF14B01)
作者单位
张 华 江苏大学 
陈 斌 合肥工业大学 
施卫东 江苏大学 
徐焰栋 江苏大学 
王 震 南京蓝深制泵集团股份有限公司 
中文摘要:结合数值计算与PIV实验手段,对一改造过的比转数ns =60的潜水排污泵蜗壳内部流动进行了研究。采用六面体结构化网格对其进行全流场数值计算,计算结果表明,由于口环泄漏导致该区域附近的湍动能最大,且设计工况下蜗壳内部湍动能要大于叶轮内部。另外,通过外特性实验结果、PIV测试结果与CFD数值计算的对比发现,二者能够较好地吻合,验证了数值计算的正确性,并得出以下结论:受叶轮出口绝对速度与圆周方向夹角随流量增加而变大的影响,在0.6Qopt 和Qopt 流量下第8断面内的流体一部分再次通过蜗壳进入第1断面内,导致蜗壳隔舌与蜗壳进口之间的速度较高,在该处造成较大的速度梯度;而在1.4 Qopt 工况下此现象消失,蜗壳第8断面附近的速度最高,速度梯度较大;并且在大流量1.4Qopt 下蜗壳第1断面与第5断面之间能够明显地看出3个从叶轮出口射流出来的高速尾迹区域。
Zhang Hua  Chen Bin  Shi Weidong  Xu Y  ong  Wang Zhen
Jiangsu University;Hefei University of Technology;Jiangsu University;Jiangsu University;Nanjing Lanshen Pump Co.,Ltd.
Key Words:Sewage pump Low specific speed Volute Numerical simulation PIV
Abstract:After structural modification of a submersible sewage pump with a specific speed (ns ) of 60, an experimental study combined with numerical simulation and PIV measurements was carried out in order to analyze the internal flow of the volute. The calculated region was spitted by structure grid and the numerical simulation of whole flow field was performed. The results showed that due to the mouth ring leakage, turbulent kinetic energy was the greatest near this region, and the turbulent kinetic energy in the volute was greater than one in the impeller at the design condition. In addition, comparisons between experiment results of pump performance, PIV test results and CFD computations showed that they were in good agreement, which also validated the numerical result. At last the following conclusions were obtained: affected by the fact that the angle between relative velocity and circumferential direction was became larger with the increasing of the flow rate, when the flow rate was 0.6 Qopt and Qopt , partial fluid in the eighth section return to the first section through the volute, so, there were great velocity and velocity gradient in the region between the tongue and volute inlet. For 1.4 Qopt , this phenomenon disappeared, and at the region near the eighth section, its velocity was maximum, which leaded to a larger velocity gradient. Besides, at the flow rate of 1.4 Qopt , in the region between the first section and the fifth section, three high-speed wake regions from the impeller outlet could be obviously observed.

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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