Accession Number : AD0451201

Title :   RESEARCH ON SOLID PROPELLANT COMBUSTION INSTABILITY.

Descriptive Note : Technical summary rept., 1 June-31 Dec 63,

Corporate Author : PRINCETON UNIV NJ

Personal Author(s) : Waesch, R. H. Woodward ; Shinnar, Reuel ; Wenograd, Joseph

Report Date : 18 JUN 1964

Pagination or Media Count : 23

Abstract : This report describes a theoretical study of the response of solid propellant combustion processes to an oscillating pressure environment. Of particular interest was the question of the temparature history of the interface between the flame zone and the product gas field. Earlier studies predicted that entropy waves should appear in the product gas field if interface conditions were isothermal. A simplified model was set up for the combustion process, in which the reaction times in the gas phase were so short as to be negligible when compared to times for solid phase processes. Analytical solutions were found for the response of the propellant to a cyclic pressure perturbation. Results of calculations based on these solutions are presented for a range of physical parameters. The results have two salient features: (1) for some ranges of parameters, the real part of the acoustic admittance is positive, implying instability at quite low frequencies, and (2) the temperature variations at the end of the flame zone are sizable at relatively low frequencies. (Author)

Descriptors :   (*SOLID ROCKET PROPELLANTS, COMBUSTION), (*COMBUSTION, THEORY), STABILITY, PARTIAL DIFFERENTIAL EQUATIONS, FLAMES, MATHEMATICAL ANALYSIS, THERMAL PROPERTIES, PHASE STUDIES, HEAT TRANSFER, MATHEMATICAL MODELS, TEMPERATURE, PRESSURE, OSCILLATION.

Distribution Statement : APPROVED FOR PUBLIC RELEASE