1. 浙江工业大学 机械工程学院， 杭州 310023; 2. 中国计量大学 计量测试工程学院， 杭州 310018
出版日期:2020-06-28发布日期:2020-07-03通讯作者:谷云庆，男，副教授，电话（Tel.）:0571-88871053；E-mail:guyunqing@zjut.edu.cn.作者简介:牟介刚(1963-)，男，吉林省通化市人，教授，博士生导师，研究方向为流体机械.基金资助:国家自然科学基金（51779226，51976193），浙江省自然科学基金(LY19E050003)资助项目Effect of Circular Non-Smooth Surface Blades on Cavitation Characteristics of Centrifugal Pump
MOU Jiegang 1,2,ZHANG Zicheng 1,GU Yunqing 2,SHI Zhengzan 1,ZHENG Shuihua 11. School of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China;2. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Online:2020-06-28Published:2020-07-03摘要/Abstract
摘要： 为了提高离心泵的抗空化特性，基于仿生学原理，在离心泵叶片最容易发生空化的吸力面处布置圆形仿生非光滑表面结构.采用数值模拟方法分析不同直径的圆形非光滑表面叶片的离心泵在不同空化余量下的外特性、空泡体积、湍动能及压力分布特性，研究圆形非光滑表面叶片对离心泵空化性能的影响.结果表明：圆形凸起直径为0.5mm和1.0mm的圆形非光滑表面叶片离心泵的扬程、效率较高，接近光滑表面叶片；在严重空化时，圆形凸起直径为1.0mm的离心泵空泡体积最小，其叶轮中截面低压区小，压力梯度大，叶片吸力面近壁面处湍动能增加，使得分离引起的压差阻力减小，对空化产生较好的抑制作用.
关键词: 离心泵, 空化, 非光滑表面, 数值模拟, 空泡
Abstract: In order to improve the anti-cavitation characteristics of centrifugal pumps, based on the bionics principle, the circular bionic non-smooth surface structure was arranged at the suction surface where the centrifugal pump blade was most prone to cavitation. The numerical simulation method was used to analyze the external characteristics, bubble volume, turbulent kinetic energy and pressure distribution characteristics of centrifugal pumps with different diameters of circular non-smooth surface blades under different cavitation allowances. The effects of circular non-smooth surface blades on the cavitation performance of centrifugal pumps were studied. The results show that centrifugal pumps with circular protrusion diameter of 0.5 mm and 1.0 mm have high heads and great efficiency, which are close to the values of centrifugal pumps with smooth surface blades. In severe cavitation, the centrifugal pump with circular protrusion diameter of 1.0 mm has the smallest bubble volume. The low pressure section of the impeller is small, the pressure gradient is large, and the turbulent energy near the wall surface of the suction surface of the blade is increased, with the result that the pressure drag caused by the separation is reduced, which has a good inhibitory effect on cavitation.
Key words: centrifugal pump, cavitation, non-smooth surface, numerical simulation, bubble
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