Aerodynamic forces induced by controlled transitory flow on a body of revolution

Coanda;Separation control;Flow control;Synthetic jets

Rinehart, Christopher S. ; Mechanical Engineering

University:Georgia Institute of Technology

Department:Mechanical Engineering

关键词: Coanda;    Separation control;    Flow control;    Synthetic jets;   

Others  :  https://smartech.gatech.edu/bitstream/1853/42830/1/rinehart_christopher_s_201112_phd.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

The aerodynamic forces and moments on an axisymmetric body of revolution arecontrolled in a low-speed wind tunnel by induced local flow attachment. Control iseffected by an array of aft-facing synthetic jets emanating from narrow, azimuthallysegmented slots embedded within an axisymmetric backward facing step. The actuationresults in a localized, segmented vectoring of the separated base flow along a rear Coandasurface and induced asymmetric aerodynamic forces and moments. The observed effectsare investigated in both quasi-steady and transient states, with emphasis on parametricdependence. It is shown that the magnitude of the effected forces can be substantiallyincreased by slight variations of the Coanda surface geometry. Force and velocitymeasurements are used to elucidate the mechanisms by which the synthetic jets produceasymmetric aerodynamic forces and moments, demonstrating a novel method to steeraxisymmetric bodies during flight.