Accession Number : ADP000259

Title :   Generation of the Patterns in Gaseous Detonations,

Corporate Author : TECHNISCHE HOCHSCHULE AACHEN (GERMANY F R) INST FUER ALLGEMEINE MECHANIK

Personal Author(s) : Schultz-Grunow,F.

Report Date : JUL 1981

Pagination or Media Count : 6

Abstract : The problem is the mode of formation of the first initial regular pattern and its spacing in a detonation front. It is generally accepted that these patterns are due to a selfsustaining process of formation of Mach stems by colliding blast waves by secondary local explosions initiated by these Mach stems whilst the reason for the very first explosions and their spacing is not known. It is shown that this is caused by temperature perturbations as they are introduced with any kind of ignition. A steady mode of perturbation is derived which initiates the first local explosions at the very end of the combustion zone. They substitute the unrealistic asymptotic decrease. The concept is in agreement with measurements of the reaction time and of the spacing of soot patterns.

Descriptors :   *Detonations, *Collisions, *Blast waves, *Pattern making, West Germany

Distribution Statement : APPROVED FOR PUBLIC RELEASE