Some Experimental Studies on Airjet and Solid Body Vortex Generators

Nagpurwala, QH and Shobhavathy, MT (2002) Some Experimental Studies on Airjet and Solid Body Vortex Generators. In: Proceedings of the Ninth Asian Congress of Fluid Mechanics.

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Abstract

generators (VGs) in an induction type wind tunnel. While the former comprised a convergent nozzle having an area ratio of 4, the later ones included vane and wedge type devices. The studies were basically aimed to determine the downstream boundary layer profiles and the field of influence of the vortices to correlate their effectiveness in the control of rotating stall in a high speed axial flow compressor stage. The simulated studies in the wind tunnel were carried out at three free stream Mach numbers of 0.2, 0.35 and 0.5. Measurements with conventional probes were supplemented by flow visualization studies. Both the vane type VGs in counter-rotating configuration and the wedge type VGs appeared to give out strong pairs of counter-rotating vortices. The range of downstream influence increased with increase in free stream Mach number. The air jet showed strongest influence in locally energizing the downstream boundary layer. Subsequent studies in an axial compressor also showed that air jet was more effective than solid body VGs in energizing the boundary layer approaching the rotor, thus delaying separation and onset of rotating stall.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Airjet, Solid Body Vortex Generators
Subjects: AERONAUTICS > Aircraft Propulsion and Power
Depositing User: Ms Indrani V
Date Deposited: 02 Jan 2014 10:22
Last Modified: 02 Jan 2014 10:22
URI: http://nal-ir.nal.res.in/id/eprint/11888

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