Accession Number:

AD0626719

Title:

AMPLIFICATION AND ATTENUATION OF SOUND BY BURNING PROPELLANTS.

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1962-04-01

Pagination or Media Count:

36.0

Abstract:

From the point of view of determining the acoustic stability of a solid propellant rocket motor, it is vital to know whether or not a sound wave is amplified or attenuated upon reflection from the burning surface. If amplification occurs, instability may result. This question has two parts to its answer. The first part concerns the burning response of the combustion layer itself to an acoustic pressure fluctuation, and the second part concerns the matching of an incident and reflected sound wave at the surface in order to determine whether the reflected wave has been amplified or attenuated. In previous theoretical treatments it has been customary to ignore the simultaneous existence of thermal or entropy waves when performing this matching procedure. In this study, the detailed matching of the thermo-acoustic field at the combustion zone boundary is carried out and the results are examined in the light of previous studies on the acoustic stability of solid propellant rocket motors. Author

Subject Categories:

  • Acoustics
  • Combustion and Ignition
  • Solid Propellant Rocket Engines
  • Solid Rocket Propellants

Distribution Statement:

APPROVED FOR PUBLIC RELEASE