Accession Number : AD0467729


Title :   Solid Propellant Combustion Mechanism Studies


Descriptive Note : Progress rept. no. 17, 1 Apr-31 Sep 1964


Corporate Author : PRINCETON UNIV NJ DEPT OF AEROSPACE AND MECHANICAL SCIENCES


Personal Author(s) : Most, William J ; Wenograd, Joseph ; Summerfield, Martin


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/467729.pdf


Report Date : Jun 1965


Pagination or Media Count : 29


Abstract : In order to explore the limits of validity of the granular diffusion flame theory of solid propellant combustion in the limiting low pressure regime, a systematic study of burning rates and particle size effects has been conducted at subatmospheric pressures. In addition, flame extinction phenomena were explored and flame photographs and chemical analysis of reaction residues were carried out. In connection with the extinction study, a new regime of combustion was discovered for certain polysulfide composite propellants containing fine oxidizer particles. When the flames of these propellants are visibly extinguished by reducing the environmental pressure, a combustion wave continues to propagate through the propellant with the formation of an ash. There are at least two possibilities for interpreting this flameless regression. The first interpretation is that it is evidence of an oxidation reaction taking place at the solid surface or inside the thermal wave. The second interpretation is that the combustion wave in an AP propellant propagates simply as the result of exothermic pyrolysis of the AP without additional heat from subsurface or surface oxidation.


Descriptors :   *COMBUSTION , *SOLID ROCKET PROPELLANTS , AMMONIUM COMPOUNDS , ATTENUATION , BURNING RATE , COMPOSITE MATERIALS , EXPERIMENTAL DATA , FLAMES , IGNITION , OXIDATION , PARTICLE SIZE , PERCHLORATES , POLYMERS , POLYSULFIDES , PRESSURE , PYROLYSIS , QUENCHING(INHIBITION) , SOLID ROCKET OXIDIZERS , SULFIDES , THERMOCOUPLES


Subject Categories : Combustion and Ignition
      Solid Rocket Propellants


Distribution Statement : APPROVED FOR PUBLIC RELEASE