低雷诺数自由翼斜出口合成射流分离流流动控制  

Separation flow control on free-wing with beveled-slit-synthetic-jet at low Reynolds numbers

作　　者：孙圣舒 顾蕴松[1] 陈勇亮[1] 赵雄[1] 

机构地区：[1]南京航空航天大学航空宁航学院,江苏南京210016

出　　处：《空气动力学学报》2017年第2期277-282,共6页Acta Aerodynamica Sinica

基　　金：江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：采用斜出口合成射流对低雷诺数自由翼进行分离流主动流动控制,通过可视化机翼表面压力测试技术和粒子图像测速技术的同步测量,探究了合成射流对自由翼平衡迎角的提升效果及合成射流作用后自由翼迎角突跃的物理机制。实验结果表明:在低雷诺数来流条件下(Re=1.24×105),自由翼的最大平衡迎角仅为5°;合成射流控制下,最大平衡迎角增至16.8°。无控制状态下,当自由翼平衡迎角达到5°时,上翼面流动分离,处于分离区内的操纵舵面舵效降低。斜出口合成射流激励器在边界层内的能量注入,使自由翼上翼面分离流再附,提高了操纵舵效,促使自由翼迎角突跃,在较大的迎角下保持稳定。在斜出口合成射流激励器的作用下,自由翼可以配平在大迎角飞行状态,对于实现短距起降具有重要的意义。Active flow control on a free wing at low Reynolds number has been investigated experimentally by using beveled-slit-synthetic-jet （BSSJ）. Synchronous measurement of visual pressure transducer system and PlV（Particle Image Velocimetry） has been used to investigate the mechanism of free-wing during the transients of AOA（angle of attack） following the onset of BSSJ. Results reveal that the maximal balanced AOA is only 5° in low Reynolds number（Re 1.24×105）, whereas it is 16.8° with BSSJ control. Due to the influence of flow separation at upper surface at balanced AOA up to 5°, the efficiency of control surface of free-wing is reduced remarkably. Energy injection in the boundary layer prompts the attachment of separation flow at upper surface and improves the efficiency of control surface. Upward force moment leads free- wing to increase the AOA and reaches to a new balanced AOA. Trimming at high balanced AOA has an important significance, with the control of BSSJ, upon SLOT（Short Take Off and Landing）.

关 键 词：自由翼 低雷诺数 合成射流 流动控制 PIV 平衡迎角 分离流 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程]