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冲角对轴流泵叶轮水力性能的影响 预览

Impacts of the Angle of Attack on Hydraulic Characteristics over the Axial flow Impeller
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摘要 【目的】研究冲角对轴流泵叶轮水力性能的影响。【方法】针对比转数为880的轴流泵叶轮,采用数值模拟方法和数值优化技术,基于儒可夫斯基翼型从3个角度进行冲角对轴流泵水力性能的影响研究。【结果】当设计参数保持不变时,冲角增大,扬程升高,比转数发生变化,最高效率增大,高效区往大流量偏移。为了使翼型处于更高质量区,建议轮缘侧翼型冲角在0~3°之间,且比转数大者取小值。当改变轮毂侧和中间断面翼型冲角时,设计工况下,为了得到较高扬程和较高效率的轴流泵叶轮,可以适当增加中间断面的翼型冲角,同时为了减小叶片扭曲改善非设计工况的水力性能,可以适当减小轮毂侧的翼型冲角。当比转数保持一致时,冲角增大,流量-扬程性能曲线的斜率减小,最高效率值保持相当,高效区范围往大流量偏移且高效区范围变宽。【结论】冲角对轴流泵叶轮水力性能有着重要影响,实际工程应用中,为保证轴流泵叶轮具有较好的水力性能应同时兼顾轮毂和轮缘侧的翼型冲角。 【Objective】This paper presents the results of a study on influence of the angle of attack on hydraulic characteristics of the axial flow impeller.【Method】The study was based on numerical simulation and optimiza-tion assuming the spinning speed of the impeller was 880.We presumed the impeller was Joukowski airfoil, and compared the impact of the angle of attack in three perspectives.【Result】When other design parameters re-mained the same, increasing the angle of attack increased the lift height and the maximum efficiency of the impel-ler;it also changed the specific speed, with the high-efficiency area shifting to the large mass flow area.To make the airfoil work at high mass region, the angle of attack on the flange side wing should be in 0°~3° by keeping the larger specific speed as small as possible.Under the design condition, changing the hub side and the middle sec-tion of the airfoil angle, in order to get a higher lift and high efficiency axial pump impeller, can be appropriate to increase the middle section of the airfoil angle, at the same time, reducing the attack angle of the wheel side wing can reduce the level of the blade distortion and improve the hydraulic performance under the off-design condi-tions.When the specific speed remained unchanged and the attack angle increased, the slope of the discharge-head characteristic curve would decrease, the maximum efficiency maintained, the high efficient area was shifted to the large mass flow offset, and the high efficiency area of pump-operation was widened.【Conclusion】The at-tack angle has an important influence on the hydraulic performance of the axial-flow impeller.In order to ensure the better hydraulic performance, the airfoil angle of the hub and rim side of the impeller should be considered at the same time.
作者 石丽建 付玲玲 刘超 汤方平 张文鹏 陈锋 SHI Lijian;FU Lingling;LIU Chao;TANG Fangping;ZHANG Wenpeng;CHEN Feng(School of Hydraulic Energy and Power Engineering,Yangzhou University,Yangzhou 225100,China;Guangling College,Yangzhou University ,Yangzhou 225100,China;Changzhou Changjiang Levee Project Management Office,Changzhou 213000,China)
出处 《灌溉排水学报》 CSCD 北大核心 2019年第4期55-62,共8页 Journal of Irrigation and Drainage
基金 国家自然科学基金项目(51376155) 江苏省水利科技项目(2017031) 国家科技支撑计划项目(2015BAD20B01-02) 扬州市科技计划项目(YZ2018103) 江苏高校优势学科建设工程资助项目(PAPD).
关键词 冲角 优化设计 轴流式叶轮 水力性能 attack angle optimization design axial-flow impeller hydraulic performance
作者简介 石丽建(1989-),男,江苏如皋人。讲师,博士,主要从事流体机械功能曲面多学科设计优化研究。E-mail:yzdxslj@126.com.
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