Supersonic jet noise suppression by water injection 13;

Krothapalli, V and Venkatakrishnan, L and Lourenco, L and Elavarasan, R (2000) Supersonic jet noise suppression by water injection 13;. In: AIAA/CEAS, Aeroacoustics Conference and Exhibit, 6th (21st AIAA Aeroacoustics Conference), 12-14 June 2000, United States.

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Abstract

An experimental investigation was carried out on a supersonic jet of air issuing from an M = 1.44 converging-diverging rectangular nozzle of aspect ratio 4. Particle Image Velocimetry measurements of the flow field, along with acoustic measurements, were obtained. The effects of a small amount of water (about 5 percent of the mass flow rate of the jet), injected into the shear layers of the jet, on the unsteady flow structure and sound generation were examined. The presence of the water droplets in the jet modified the turbulence structure significantly, resulting in rms velocity reductions greater than 30 percent as compared to those of a normal jet. Similar reductions of the forcing term of the Phillip's equation, which represents the generation of the pressure fluctuations in the jet, were also found. The changes observed in the near-field noise measurements, due to water injection, are consistent with the unsteady flow modifications. (Author) 13; 13;

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Supersonic aircraft;Modification;Nozzles;Acoustic measurement;Turbulence;Jet noise;Mathematical analysis; Mass flow;Fluctuation;Aspect atio;Noise;Velocity;Supersonic jet flow;Jet aircraft noise;Noise reduction;Water injection;Air jets;Mass flow rate;Particle image velocimetry
Subjects: AERONAUTICS > Aerodynamics
Division/Department: Other, Experimental Aerodynamics Division, Other, Other
Depositing User: Ms Indrani V
Date Deposited: 14 Nov 2005
Last Modified: 24 May 2010 09:39
URI: http://nal-ir.nal.res.in/id/eprint/823

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