Acoustic waves from a supersonic jet impinging on an inclined flat plate

Taku Nonomura, Yoshinori Goto, Kozo Fujii

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

8 Citations (Scopus)

Abstract

Flow and flow-induced acoustic fields of a supersonic jet impinging on an inclined flat plate is computationally studied. Effects of nozzle-plate distance and jet temperature are discussed as these are important parameters for the estimation of the acoustic wave strength from the engineering viewpoint such as a rocket plume. Three-dimensional compressible Navier-Stokes equations are solved with the modified weighted compact nonlinear scheme for the numerical simulations. Simulation results are analyzed from the viewpoints of acoustic emission and propagation mechanism, and acoustic field characteristics such as directivity, their spectra, and acoustic wave source positions are investigated. Time-averaged pressure contour on the plate shows two pressure peaks that are commonly observed in the jet-plate interaction; one by the jet impingement and the other by the plate shock wave. The acoustic fields indicate that there are at least three kinds of acoustic waves in all the cases considered in the study: (i) Mach waves generated from the shear layer of the main jet, (ii) acoustic waves generated from the impingement region, and (iii) Mach waves generated from the shear layer of the supersonic flow downstream of the jet impingement. Indication of the second one (ii) is important because the commonly-used empirical method for the estimation of the acoustic waves from a rocket plume does not consider such acoustic waves. Directivity and sound pressure level of the acoustic waves (ii) and the Mach waves (iii) change strongly with the temperature increase. Directivity and sound pressure level of the acoustic waves (ii) and the Mach waves (iii) change slightly with the nozzle-plate distance increase. The results show that whether the impinging point is inside or outside of potential core does not strongly affect the characteristics of the induced acoustic waves (ii).

Original languageEnglish
Title of host publication48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781600867392
DOIs
Publication statusPublished - 2010
Externally publishedYes

Publication series

Name48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

ASJC Scopus subject areas

  • Aerospace Engineering

Fingerprint

Dive into the research topics of 'Acoustic waves from a supersonic jet impinging on an inclined flat plate'. Together they form a unique fingerprint.

Cite this