Characteristics of Dual Transverse Injection in Scramjet Combustor, Part 2: Combustion

Abstract

The combustion characteristics of a dual transverse injection system in a scramjet combustor were studied with numerical methods. The effects of the jet-to-crossflow momentum flux ratio and the distance between injectors on combustion characteristics were investigated. It is shown that the dual injection system has very different combustion characteristics with respect to the single injection system; the burning process of the rear injection flow is strongly influenced not only by the blockage effects but also by the preheating effects due to the chemical reactions of the front injection flow. The dual injection system has a higher burning rate and a higher flame height but more loss of stagnation pressure than the single injection system. It is also shown that there is an optimal distance between injectors for combustion characteristics and that the optimal distance increases as the jet-to-crossflow momentum flux ratio increases.