排灌机械工程学报
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排灌机械工程学报  2012, Vol. 30 Issue (3): 270-273    DOI: 10.3969/j.issn.1674-8530.2012.03.005
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弯掠叶片对轴流泵驼峰及空化性能的影响
刘竹青1, 肖若富1, 吕腾飞1, 李述林2

(1. 中国农业大学水利与土木工程学院, 北京 100083; 2. 航空机电系统综合航空科技重点实验室, 江苏 南京 211106)
Effect of swept blade on hump and cavitation characteristics of axial flow pump
 LIU  Zhu-Qing1, XIAO  Ruo-Fu1, Lv Teng-Fei 1, LI  Shu-Lin2

(1. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083,China; 2. Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration,Nanjing, Jiangsu 211106, China)
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摘要 以高速轴流泵为研究对象,通过改变叶片在轴面的积迭线得到弯掠叶片.分别对弯掠叶片高速轴流泵和原型叶片高速轴流泵进行全三维流道整机数值模拟,得到其外特性曲线,并针对设计工况和出现“驼峰区”时对应的失速工况施加空化模型进行数值模拟,研究叶片的弯掠对其空化性能的影响及叶片表面压力分布规律.模拟结果对比表明:合理的弯掠叶片可有效改善原型叶片轴流泵出现的“驼峰区”,控制叶顶二次流的发生及发展,回收端壁二次流的能量损失,从而改善轴流泵在驼峰区的运行性能;同时,弯掠叶片提高了轴流泵在失速工况的空化性能,改变其叶片进口处梯度分布,避免了流体在壁面较易产生的分离流动;但在设计工况时其空化性能劣于原型叶片轴流泵,叶片表面压力分布也显示,原型叶片的表面压差大于弯掠叶片的表面压差,因此在设计工况时原型叶片的做功能力优于弯掠叶片.
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刘竹青
肖若富
吕腾飞
李述林
关键词轴流泵   弯掠叶片   空化性能   计算流体动力学     
Abstract: A swept blade was designed based on changing the stacking line in the meridional plane of an axial flow pump impeller. The high speed fuel axial flow pumps, with swept blades and datum blades respectively, were simulated in the overall operation by the code of computational fluid dynamics (CFD) and the overall efficiency and pump head performance curves were obtained. Using the full cavitation model, the cavitation performances of pumps were predicted under the designed point condition and near stall point condition to investigate the effects of swept blade on the cavitation performance and distribution of pressure on blade surfaces of an axial flow pump. According to the numerical results, the swept blade changes the hump characteristic of the axial flow pump, controls the onset and growth of the secondary flows, and recovers the lowenergy fluid on the endwalls. Therefore, the stability of operation in the hump zones is improved. Near stall point condition, the swept blade improves the cavitation characteristic of the pump, changes the pressure distribution on the impeller inlet, and avoids the separated flow on the endwalls. While under the design point condition, the swept blade reduces the cavitation characteristic, the blade surface pressure distribution also presents the pressure difference of the datum blade is higher than the swept blade, resulting in the ability of doing work of the former is better than the latter.
Key wordsaxial flow pump   swept blade   cavitation characteristic   computational fluid dynamics   
收稿日期: 2011-11-05; 出版日期: 2012-04-10
基金资助:

国家自然科学基金资助项目(50809073,51079152)

通讯作者: 刘竹青(1973—),男,山西武乡人,副教授(lzq@cau.edu.cn),主要从事流体机械与流体工程、风力资源利用技术研究.   
作者简介: 肖若富(1976—),男,浙江苍南人,副教授(通信作者,xrf@cau.edu.cn),主要从事流体机械优化设计及流固耦合研究.
引用本文:   
刘竹青,肖若富,吕腾飞等. 弯掠叶片对轴流泵驼峰及空化性能的影响[J]. 排灌机械工程学报, 2012, 30(3): 270-273.
LIU Zhu-Qing,XIAO Ruo-Fu,吕Teng-Fei et al. Effect of swept blade on hump and cavitation characteristics of axial flow pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(3): 270-273.
 
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