Exploring confined counterflow shear layer turbulence for fluidic thrust vectoring applications
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The effects of a novel actuator that makes use of blowing and suction within a cavity to generate countercurrent shear were studied and compared to the effects of a transverse slot jet. Cases where counterflow generated with either blowing or suction, or combinations of simultaneous blowing and suction were studied using digital particle image velocimetry. The purpose of the actuator is to create countercurrent shear while avoiding the creation of a global stagnation point in the main jet. Suction flow creates a recirculation region contained within the cavity, and levels of blowing that are lower than suction assist in locating the recirculation region within the cavity. Vector angles were calculated for cases representing the different secondary flow scenarios and were compared to the results obtained for the transverse slot jet. The cavity performed better than the slot at vectoring the flow and at generating turbulence in the primary flow.