来流攻角与扩压对翼型涡旋脱落的影响  

Influence of Flow Angle of Attack and Pressure Diffuser of Hydrofoil Vortex Shedding

作　　者：史天蛟 冉红娟 王德忠[1] 刘永[1] 陆于衡 

机构地区：[1]上海交通大学,上海200240

出　　处：《大电机技术》2018年第1期65-70,共6页Large Electric Machine and Hydraulic Turbine

摘　　要：为了对叶轮机械中旋转失速的成因提供参考,深入理解旋转失速涡团的产生过程和规律,基于RANS方法对NACA0009翼型综合考虑来流攻角和扩压影响的情况进行了数值模拟,并使用翼型试验段进行实验测量。研究表明:在来流攻角与扩压条件同时具备的条件下,易出现涡流脱落的非稳态特性。在攻角较大时,涡旋脱落频率随着与来流攻角的增加而减小,频率幅度增加。流场中存在多种频率的不稳定流动,小攻角时频率分布均匀,大攻角时频率集中在低频。RANS方法可以对低频信号给出较好的模拟结果。In order to provide a reference for the cause of rotating stall in the impeller, to understand the generation process and rule of the rotating stall vortex. The numerical simulation of NACA0009 airfoil based on RANS method was conducted, considering the angle of attack and the effect of pressure diffuser. The hydrofoil section was used for the experimental measurement. The results show that under the condition that the angle of attack and the conditions of pressure diffuser the unsteady characteristics of vortex shedding appear easily.When the angle of attack is large, the frequency of vortex shedding decreases with the increase of the angle of attack, and the frequency amplitude increases. There are many kinds of unsteady flow in the flow field, the frequency distribution is uniform when the angle of attack is low, and the frequency is concentrated at low frequency when the angle of attack is large. The RANS method can get a good result for the low frequency signal.

关 键 词：翼型 攻角 扩压 涡脱落频率 旋转失速 

分 类 号：TK72[动力工程及工程热物理—流体机械及工程] TV32[水利工程—水工结构工程]