International Journal of Aerospace and Lightweight Structures

doi: 10.3850/S2010428613000068

Analysis of Acoustic-Fields Generated by a Supersonic Jet Impinging on Flat and Curved Inclined Plates

Yuki Nagata^1,a, Taku Nonomura^2,c, Kozo Fujii^2,d and Makoto Yamamoto^{1,b 1}Mechanical Engineering, Tokyo University of Science, 125-8585, Katsushika, Tokyo, Japan. ^aj4513639@ed.tus.ac.jp ^byamamoto@rs.kagu.tus.ac.jp ²Japan Aerospace Exploration Agency, Fujii lab., 252-5210, Sagamihara, Kanagawa, Japan. ^cnonomura@flab.isas.jaxa.jp ^dfujii@flab.isas.jaxa.jp

ABSTRACT

Flow and acoustic-fields of a supersonic jets impinging on an inclined flat plate and arc plates are computationally analyzed toward the prediction of the rocket plume acoustic waves at the rocket fairing. Effects of angle and curvature of plates on the acoustic-field are investigated in detail. A weighted compact nonlinear scheme is employed and three- dimensional compressible Navier-Stokes equations are solved. The results show that two acoustic waves generated by the interaction of shock and shear layer in the vicinity of the jet impinging affect the magnitude of sound pressure level near the fairing of the rocket in the case of the flat plate The plate angle greater than 55 degree significantly reduces the sound pressure level at the rocket fairing. Over-all sound pressure level becomes larger when curvature of the arc plate increases in the case of the arc plate because of change in directivity of acoustic waves.

Keywords: Mach wave, SSLI wave, Shock wave.

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