Regularities between kinematic and aerodynamic characteristics of flexible membrane wing  

作　　者：Xi HE Qinfeng GUO Jinjun WANG 

机构地区：[1]Fluid Mechanics Key Laboratory of Education Ministry,Beihang University,Beijing100083,China

出　　处：《Chinese Journal of Aeronautics》2022年第11期209-218,共10页中国航空学报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(Nos.11761131009 and 11721202)。

摘　　要：The kinematic characteristics of flexible membrane wing have vital influences on its aerodynamic characteristics. To deeply explore the regularities between them, time-resolved aerodynamic forces and deformations at different aeroelastic parameters and angles of attack(α) were measured synchronously by wind tunnel experiments. The membrane motion can be mainly divided into two states at α > 0° with various lift-enhancement regularities: Deformed-Steady State(DSS)at pre-stall, and Dynamic Balance State(DBS) at around stall and post-stall. Besides, the mean camber, maximum vibration amplitude, and lift coefficient almost reach their maxima simultaneously within the DBS region. By introducing momentum coefficient Cμ of membrane vibration, positive correlation among amplitude, momentum and lift is successfully established, and the liftenhancement mechanism of membrane vibration is revealed. Moreover, it is newly and surprisingly found that at different vibration modes, the maximum vibration amplitude and root mean square of vibration velocity present positive and linear correlation with different slopes, and their chordwise locations are basically consistent. Therefore, novel ideas for active control of flexible wing are proposed: by controlling the vibration amplitude, frequency, and mode, while selecting the specific chordwise locations for intensive excitation, Cμ can be efficiently increased. Ultimately, the aerodynamic performance will be improved.

关 键 词：Aerodynamic forces Flexible wings Fluid structure interaction Kinematic analysis Lift-enhancement mechanism Wind tunnel tests 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]