Active flow control in high-speed internal flows

Flow control shock

Gissen, Abraham Naroll ; Glezer, Ari Mechanical Engineering Jagoda, Jechiel Costello, Mark Sankar, Lakshmi Vukasinovic, Bojan Mace, James ; Glezer, Ari

University:Georgia Institute of Technology

Department:Mechanical Engineering

关键词: Flow control shock;   

Others  :  https://smartech.gatech.edu/bitstream/1853/54865/1/GISSEN-DISSERTATION-2015.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

Manipulation of high-speed duct flow by streamwise vorticity concentration that areengendered by interactions of surface-mounted passive and active flow control actuators with the cross flow is investigated experimentally in a small-scale wind tunnel. The controlled formation of these streamwise vortices can be a key element in the mitigation of the adverse flow effects ina number of applications including aero-optical aberrations owing to unsteady local transonic shocks, pressure recovery and distortion due to secondary flows in embedded propulsion system, thrusts reversal and augmentation for aerodynamic control. The effects of the actuation areinvestigated using various converging-diverging inserts along one of the test section walls. Passive actuation includes micro-vanes and active actuation is effected using high-frequency, surface-mounted fluidic oscillators. Hybrid actuation is demonstrated by combining the passiveand active actuation approaches to yield a “fail-safe” device with significant degree ofcontrollability. The investigations consider the effects of the surface actuation in threeapplication areas namely, stabilization of transonic shocks, suppression of total-pressure distortion in offset ducts, and mitigation of separation in internal flow turning.