Accession Number : AD0626723

Title :   ON ACOUSTIC DAMPING IN CAVITIES WITH MEAN VELOCITY AND THERMAL BOUNDARY LAYERS.

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Cantrell,R. H. ; McClure,F. T. ; Hart,R. W.

Report Date : DEC 1962

Pagination or Media Count : 40

Abstract : Viscous and thermal losses of acoustic energy at a metal wall are calculated for the condition in which there is a low Mach number flow sustaining a temperature difference between the gas and the wall. The acoustic loss is found to decrease as the walls are cooled below the temperature of the main body of the gas. The results of the study are relevant to experiments on acoustic amplification by solid rocket propellants and to at least some cases of liquid propellant rocket acoustic instability. (Author)

Descriptors :   (*SOLID PROPELLANT ROCKET ENGINES, ACOUSTICS), (*LIQUID PROPELLANT ROCKET ENGINES, ACOUSTICS), COMBUSTION CHAMBERS, OSCILLATION, DAMPING, FLUID FLOW, COOLING, BOUNDARY LAYER, THERMODYNAMICS

Subject Categories : Acoustics
      Combustion and Ignition
      Liquid Propellant Rocket Engines
      Solid Propellant Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE