Supersonic jet noise reduction by nozzle fluidic inserts with simulated forward flight

Russell W. Powers, Dennis K. McLaughlin, Philip J. Morris, Ching Wen Kuo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

21 Scopus citations

Abstract

The noise produced by supersonic, high temperature jets that exhaust from military aircraft is becoming more of a disturbance. Methods to reduce the noise produced from these jets in a realistic full-scale environment is difficult. This study describes the development and analysis of fluidic inserts for supersonic jet noise suppression. Distributed blowing within the divergent section of the military-style convergent divergent nozzle alters the shock structure of the jet in addition to creating streamwise vorticity for the reduction of mixing noise. Enhancements to the fluidic insert design have been performed along with experiments for a large number of injection parameters and core jet conditions. It has been shown that the noise reduction of the fluidic inserts is most heavily dependent on the momentum flux ratio between the injector and core jet. Maximum reductions of approximately 5.5 dB OASPL have been observed with practical mass flow rates and injection pressures. The first measurements with fluidic inserts in the presence of a forward flight stream have been performed. Optimal noise reduction occurs at similar injector parameters in the presence of forward flight. Fluidic inserts in the presence of a forward flight stream were observed to reduce the peak mixing noise by nearly 4 dB OASPL and the broadband shock-associated noise by nearly 3 dB OASPL.

Original languageEnglish (US)
Title of host publication20th AIAA/CEAS Aeroacoustics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624102851
StatePublished - Jan 1 2014
Event20th AIAA/CEAS Aeroacoustics Conference 2014 - Atlanta, GA, United States
Duration: Jun 16 2014Jun 20 2014

Publication series

Name20th AIAA/CEAS Aeroacoustics Conference

Other

Other20th AIAA/CEAS Aeroacoustics Conference 2014
CountryUnited States
CityAtlanta, GA
Period6/16/146/20/14

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Mechanical Engineering

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  • Cite this

    Powers, R. W., McLaughlin, D. K., Morris, P. J., & Kuo, C. W. (2014). Supersonic jet noise reduction by nozzle fluidic inserts with simulated forward flight. In 20th AIAA/CEAS Aeroacoustics Conference (20th AIAA/CEAS Aeroacoustics Conference). American Institute of Aeronautics and Astronautics Inc..