Parametric performance analysis of multiple reheat cycle for hydrogen fueled scramjet with multi-staged fuel injection

Multi-staged fuel injection is a good choice for hydrogen fueled scramjet engine to overcome the restriction of thermal choke and over-temperature. From a thermodynamic perspective, the multi-staged fuel injection is the practical application of reheat cycle. A parametric performance model has been developed for the hydrogen-fueled scramjet with multi-staged fuel injection to analyze its performance. The key parameters which affect the engine performance of scramjet with multi-staged fuel injection are total combustor area expansion ratio, reheat times and distribution ratio of area expansion. These parameters were carefully analyzed to provide some direct and transparent results for engine designers. The results showed that the specific thrust of scramjet can be greatly improved by increasing the total combustor area expansion ratio and reheat times, and/or choosing an appropriate distribution proportion of area expansion ratio. The effect of increasing the total combustor area expansion is most obvious for performance enhancement.