程千,冯卫民,周龙才,李娜.前置导叶对轴流泵马鞍区工况回流涡特性的影响[J].农业机械学报,2016,47(4):8-14.
Cheng Qian,Feng Weimin,Zhou Longcai,Li Na.Effects of Inlet Guide Vane on Characteristics of Backflow Vortex in Hump Region of Axial Flow Pump[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(4):8-14.
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前置导叶对轴流泵马鞍区工况回流涡特性的影响   [下载全文]
Effects of Inlet Guide Vane on Characteristics of Backflow Vortex in Hump Region of Axial Flow Pump   [Download Pdf][in English]
投稿时间:2015-09-22  
DOI:10.6041/j.issn.1000-1298.2016.04.002
中文关键词:  轴流泵  回流涡  前置导叶  数值模拟
基金项目:“十二五”国家科技支撑计划项目(2012BAD08B03)
作者单位
程千 武汉大学 
冯卫民 武汉大学 
周龙才 武汉大学 
李娜 中国灌溉排水发展中心 
中文摘要:基于RANS方程和SST k—ω湍流模型,对带前置导叶轴流泵进行三维非定常计算,研究了“马鞍区”工况进水流道回流涡的特性以及前置导叶对回流涡结构及压力脉动的影响,揭示了前置导叶提高轴流泵“马鞍区”工况扬程的机理。结果表明,小流量工况,轴流泵进水流道内形成大范围螺旋形回流,其与主流的剪切作用导致回流涡的产生,引起大量低频压力脉动,并造成能量损失,致使泵扬程下降,出现马鞍形;增设前置导叶可打破连续的回流涡,降低低频压力脉动幅值,提高轴流泵运行稳定性;同时,前置导叶可提高轴流泵扬程,消除扬程曲线马鞍形,且随着前置导叶位置不断靠近叶轮进口,泵扬程提高幅值不断增大;最后,前置导叶调角可进一步提高轴流泵扬程。
Cheng Qian  Feng Weimin  Zhou Longcai  Li Na
Wuhan University,Wuhan University,Wuhan University and China Irrigation and Drainage Development Center
Key Words:axial flow pump  backflow vortex  inlet guide vane  numerical simulation
Abstract:The hump characteristic is one of the detrimental characteristics of axial flow pump. If the pump runs in the hump region, some unsteady flows will occur, such as stall, backflow, cavitation and so on, which will reduce the pump performance. In order to analyze the hump characteristics, numerical method based on the RANS equations and SST k—ω turbulence model was used to simulate the instability flows in the axial flow pump with and without inlet guide vane. The hexahedral meshing scheme was used for the whole computational domain, particularly with O-grid around blades. The characteristics of swirling backflow vortex were firstly investigated. The influences of different distances between inlet guide vane and impeller blade on the swirling backflow vortices and the pressure fluctuations were studied. The effects of variable angles of inlet guide vane on pump performance were also discussed. The results showed that the predicted results were in good agreement with the experimental data. When the flow rate decreased, the backflow region was extended upstream. During the development of the backflow, the swirling vortices occurred in the shear layer between the swirling backflow and the main flow, which caused a lot of low frequency pressure fluctuations and consumed energies, leading to pump head decrease and hump characteristic. The swirling backflow vortices can be broken by inlet guide vane, resulting in decrease of amplitudes of low frequency pressure fluctuations and increase of pump head due to less energy consumed by the swirling vortices. Thus, the hump characteristic of axial flow pump can be improved by inlet guide vane. With the reduction of the distance between inlet guide vane and impeller blade, pump head was increased continuously. In addition, pump head was increased at negative angle of inlet guide vane, while it decreased at positive angle of inlet guide vane, which was resulted from the prewhirl regulation.

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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