叶顶吸气效应抑制叶片振动的研究  

Suction effect on suppressing blade vibration

作　　者：丁磊[1] 何立东[1] 李金波[1] 

机构地区：[1]北京化工大学诊断与自愈工程研究中心,北京100029

出　　处：《振动与冲击》2010年第6期121-124,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金(50675013);国家"863"计划(2007AA04Z422)

摘　　要：吸气可以改变叶片周围的气流特性,多用来控制叶片吸力面流动分离。将吸气应用于叶片减振,通过模型实验研究了吸气对叶片振动的影响,改变吸气位置和吸缝长度,测量了不同条件下的叶片振幅并作比较。数值模拟计算了不同位置、不同速度吸气对叶片周围流场的影响,重点分析了叶顶间隙气流速度的变化。数值计算在一定程度上解释了实验结论,二者所得的规律统一。最终结果表明:叶片正上方或上方偏来流侧吸气有明显减振效果,模型实验条件下,振幅最大降低了27%。Suction can influence the air performance around blade,and thus can be used to control flow separation along surface of a blade.Variations of blade vibration were studied experimentally with consideration of suction effect.The vibration amplitude of blade was measured at different suction positions or with different gap lengths.The effect of fluid field around blade was analyzed by numerical simulation in different conditions,including at different suction positions and with different suction velocities.However,the impact of gas velocity at tip clearance was emphasized.The laws induced from experimental study and simulation calculation are consistent with each other.Some important conclusions were given in the paper.The vibration could be suppressed due to suction before or above the blade.The maximal attenuation of blade amplitude is up to 27% in the experimental condition.

关 键 词：吸气 叶片振动 减振 模型实验 数值模拟 叶顶间隙气流速度 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]