张帆,袁寿其,付强,洪锋,陶艺.双蜗壳式离心泵内部非定常流动压力特性分析[J].农业机械学报,2015,46(2):52-58.
Zhang Fan,Yuan Shouqi,Fu Qiang,Hong Feng,Tao Yi.Analysis on Pressure Characteristics during Internal Unsteady Flow in Double Volute Centrifugal Pump[J].Transactions of the Chinese Society for Agricultural Machinery,2015,46(2):52-58.
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双蜗壳式离心泵内部非定常流动压力特性分析   [下载全文]
Analysis on Pressure Characteristics during Internal Unsteady Flow in Double Volute Centrifugal Pump   [Download Pdf][in English]
投稿时间:2014-03-11  
DOI:10.6041/j.issn.1000-1298.2015.02.009
中文关键词:  离心泵 双蜗壳 非定常流动 压力脉动
基金项目:“十二五”国家科技支撑计划资助项目(2011BAF14B04)、国家自然科学基金重点资助项目(51239005)、江苏省普通高校研究生科研创新计划资助项目(KYLX_1042)、江苏省水利动力工程重点实验室资助项目(K13025)和江苏高校优势学科建设工程资助项目(PAPD)
作者单位
张帆 江苏大学 
袁寿其 江苏大学 
付强 江苏大学 
洪锋 江苏大学 
陶艺 江苏大学 
中文摘要:为研究双蜗壳式离心泵内部流动特性,基于标准k—ε湍流模型和标准无滑移网格模型,应用CFX软件对其不同工况下的非定常流动进行三维数值模拟,得到了不同工况下双蜗壳式离心泵叶轮和蜗壳内部流道的压力脉动特性。计算结果表明,在小流量工况下,各监测点处的压力脉动都比较大且不均匀;在叶轮流道中,叶轮流道靠近出口边缘的压力脉动是叶轮流道其他区域压力脉动的5~8倍;在流量Q为34、110、148、160m3/h 4个工况下叶轮分别旋转30步(90°)和90步(270°)时,压力脉动出现最大值。双蜗壳内圈流道的压力脉动强于外圈流道的压力脉动且隔舌处出现压力脉动较大值,大流量工况下双蜗壳隔舌和出口产生一定回流导致蜗壳该处附近监测点压力脉动先减小后增大。从傅里叶变换得到频域特性可知, 叶频及其倍频是压力脉动的主要频率,且呈衰减趋势。
Zhang Fan  Yuan Shouqi  Fu Qiang  Hong Feng  Tao Yi
Jiangsu University,Jiangsu University,Jiangsu University,Jiangsu University and Jiangsu University
Key Words:Centrifugal pump Double volute Unsteady flow Pressure fluctuation
Abstract:In order to analyze the internal flow characteristics of a double volute centrifugal pump, the CFD software CFX was applied to simulate the unsteady flow among different working conditions based on standard k—ε turbulence model and standard no slip mesh model. The pressure fluctuation characteristics under different working conditions on flow channels both in the impeller and the volute were obtained. The results showed that pressure pulsation of each monitoring point was relatively large and uniform under the condition of low flow rate. Pressure fluctuation near the edge of impeller outlet was 5~8 times stronger than that in other region of the impeller. In the case of rotating 30 steps (90°) and 90 steps (270°) during four working conditions, the value of pressure reached to maximum. Pressure fluctuation in the inner flow passage was stronger than that in the outer flow passage of the double volute, and it reached to maximum in the tongue of the double volute. The pressure fluctuation decreased firstly and then increased near the tongue and outlet of volute in the large flow rate due to a certain back-flow. It can be concluded from fast Fourier transform that the frequency of the impeller and its multiples were main frequencies of pressure fluctuation which presented a decreasing tendency.

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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