司乔瑞,袁寿其,李晓俊,袁建平,卢加兴.空化条件下离心泵泵腔内不稳定流动数值分析[J].农业机械学报,2014,45(5):84-90.
Si Qiaorui,Yuan Shouqi,Li Xiaojun,Yuan Jianping,Lu Jiaxing.Numerical Simulation of Unsteady Cavitation Flow in the Casing of a Centrifugal Pump[J].Transactions of the Chinese Society for Agricultural Machinery,2014,45(5):84-90.
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空化条件下离心泵泵腔内不稳定流动数值分析   [下载全文]
Numerical Simulation of Unsteady Cavitation Flow in the Casing of a Centrifugal Pump   [Download Pdf][in English]
投稿时间:2013-06-03  
DOI:10.6041/j.issn.1000-1298.2014.05.013
中文关键词:  离心泵 空化 泵腔 不稳定流动 数值模拟
基金项目:国家自然科学基金重点资助项目(51239005)、江苏高校优势学科建设工程资助项目、“十二五”国家科技支撑计划资助项目(2011BAF14B04)和江苏省普通高校研究生科研创新计划资助项目(CXZZ12_0679)
作者单位
司乔瑞 江苏大学 
袁寿其 江苏大学 
李晓俊 江苏大学 
袁建平 江苏大学 
卢加兴 江苏大学 
中文摘要:为研究不同空化发展阶段离心泵泵腔内的流动情况及其对叶轮的影响,提出了一种泵腔区域的拓扑块生成和结构化网格划分方法。在充分考虑近壁区网格质量的基础上,采用SST k-ω湍流模型和Rayleigh-Plesset空化模型对设计工况下某离心泵进行了全流场空化数值模拟,并计算了3种有效汽蚀余量下泵腔内的非定常流动情况及其对叶轮的作用力。结果表明:空化造成泵腔内压力脉动的幅值增大,由于前口环的存在,其前泵腔内的压力脉动幅值大于后泵腔;空化的加剧造成泵腔内宽频脉动的增加,以轴频最为明显;空化的加剧不仅影响泵腔内的流态,同时也增大了设计工况下作用于叶轮上的径向力和轴向力
Si Qiaorui  Yuan Shouqi  Li Xiaojun  Yuan Jianping  Lu Jiaxing
Jiangsu University;Jiangsu University;Jiangsu University;Jiangsu University;Jiangsu University
Key Words:Centrifugal pump Cavitation Pump casing Unsteady flow Numerical simulation
Abstract:In order to study the cavitating flow at different stages of cavitation in the pump casing of a centrifugal pump, the topology blocking and structured mesh generation strategies was proposed on the domain of the pump. Taking full account of the near wall region mesh quality, steady and unsteady cavitation simulation of the centrifugal pump has been proceed using the SST k-ω turbulence model combining with Rayleigh-Plesset cavitation model. Unsteady flow of the pump chamber and the force endured by the impeller were obtained under three NPSHa. The results show that cavitation increases the amplitude of pressure pulsation in pump casing sharply. Due to the presence of the wear rings, amplitude of pressure pulsation at front side chamber is greater than back side chamber. Broadband pulsation frequency increase with the cavitation intensifies, especially at axis frequency. Intensification cavitation not only affects the flow pattern of the pump chamber, but also increases the radial and axial forces acting on the impeller.

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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