THE INITIATION OF GASEOUS DETONATIONS IN H_2-O_2 MIXTURES BY INCIDENT SHOCK WAVE

摘要

Detonations are an extremely efficient means of burning a fuel-air mixtures and releasing its chemical energy content. Recently there has been renewed interest in the application of intermittent or pulsed detonation to propulsion The application of detonations involves many difficulties in rapidly mixing the fuel and air, and initiating and sustaining a detonation in a controlled manner. One method of initiating detonation is by using a shock wave to heat the mixture to a temperature, -which is above the autoignition temperature. The initiation of detonation by planar shock in constant area tubes has been studied in the past by several authors. In most of these studies the conventional single-diaphragm shock tube technique was used to initiate detonation. This method suffered from several disadvantages, notably those arising from the nonideality of the diaphragm rupture introducing very nonuniform conditions at the interface separating driver gas from the combustible test mixture. For this reason this technique was displaced by removable sliding plate method which was unfortunately also causing nonuniformity - in the interface zone. The main objective of the present experiments was to perform preliminary studies of the influence of disturbances on autoignition behind planar shock and initiation of detonation in H_2 -