Accession Number : AD0655795

Title :   ACOUSTIC ENERGY FLUX FROM SHOCK-TURBULENCE INTERACTION.

Descriptive Note : Technical note,

Corporate Author : TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s) : Ribner,H. S.

Report Date : JUL 1967

Pagination or Media Count : 26

Abstract : The analysis of the sound field generated by the passage of isotropic turbulence through a shock of finite strength (Ribner, 1953, 1954) was extended to provide the flux of acoustic energy. The energy flux varies almost linearly with shock density ratio, reaching a maximum at infinite Mach number of 0.062 of the flux of turbulence kinetic energy. Direct comparison with a result obtained by Lighthill (1953) is misleading. His energy relations, reckoned relative to a frame moving with the fluid, must be converted to the shock-fixed frame used in this report. The converted results of his theory (weak shocks) and the results of the author's theory (arbitrary shocks) appear to show a similar asymptotic behavior for vanishing shock strength; they diverge with increasing shock strength. (Author)

Descriptors :   (*AERODYNAMIC NOISE, ENERGY), (*SHOCK WAVES, TURBULENCE), ACOUSTIC PROPERTIES, INTERACTIONS, MATHEMATICAL ANALYSIS, KINETIC ENERGY, CANADA

Subject Categories : Aerodynamics
      Acoustics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE