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Investigation of Microjet Injection for Reduction of Supersonic Jet Noise

[+] Author Affiliations
Ryuichi Okada, Toshinori Watanabe, Seiji Uzawa, Takehiro Himeno

University of Tokyo, Tokyo, Japan

Tsutomu Oishi

IHI Corporation, Tokyo, Japan

Paper No. GT2010-23036, pp. 309-317; 9 pages
doi:10.1115/GT2010-23036
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Education; Electric Power; Manufacturing Materials and Metallurgy
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4396-3 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

Jet noise reduction is one of essential issues to realize environmentally-friendly and highly-efficient supersonic jet propulsion system. In the present study, experimental and numerical investigations were conducted in order to clarify the effect of microjet injection on supersonic jet noise. The experiments were focused on supersonic jet with Mach number up to 1.49, generated from a rectangular nozzle with high aspect ratio. The microjet injection angle was set to 90 degrees against the main jet axis. Far field measurements were conducted for the jet noise in the cases with and without microjet injection, and the noise reduction up to 7.5 dB was obtained. To study the mechanism of noise reduction, flow field visualization by schlieren technique and CFD analysis were conducted.

Copyright © 2010 by ASME
Topics: Noise (Sound)

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