受限空间内压电风扇气动阻力的预测方法  

Prediction for aerodynamic drag of piezoelectric fan in confined space

作　　者：李娜 刘洋 高吉刚 黄再兴[2] 李恒超 LI Na;LIU Yang;GAO Jigang;HUANG Zaixing;LI Hengchao(School of Energy Science and Engineering,Nanjing Tech University,Nanjing 211800,China;College of Aerospace Engineering,Nanjing University of Aeronautics and astronautics,Nanjing 210016,China)

机构地区：[1]南京工业大学能源科学与工程学院,南京211800 [2]南京航空航天大学航空学院,南京210016

出　　处：《航空动力学报》2023年第9期2204-2213,共10页Journal of Aerospace Power

基　　金：机械结构力学及控制国家重点实验室开放课题(MCMS-E-0220G01)。

摘　　要：围绕受限空间压电风扇的气动阻力、振幅响应及其与非定常流场的内在关联机制和规律这一核心问题开展深入的理论分析和数值模拟研究,分别基于牛顿内摩擦定律和附加流体质量力作用机制,建立了四周空间受限的压电风扇振动薄片一阶弯曲响应瞬时气动阻力的理论模型,并进一步建立了其振幅响应的预测方法。经过验证,预测模型的预测结果与试验获得规律基本一致。当空间受限间隙小于5 mm时的振幅将随间隙的减小而急剧减小,当间隙大于20 mm时的空间受限效应基本可以忽略。The study focused on the correlation mechanisms and laws between the aerodynamic drag,resonance response,and the unsteady flow field of the piezoelectric fans in confined space by theoretical analysis and numerical simulation.Based on Newton’s law and added-mass mechanism of viscous fluid,the model and prediction method were established for transient aerodynamic drag and 1st order bending amplitude response of piezoelectric fan in the confined space around.The developed predictive models were validated,and the results showed that there was a good agreement with the experimental results.The amplitude response decreased sharply when the gap was smaller than 5 mm.The space-limited effects can be ignored when the gap was about 20 mm.

关 键 词：压电风扇 气动阻力 振动响应 流固耦合 非定常流场 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]