Effect of Supercritical Fuel Injection on Cycle Performance of Pulsed Detonation Engine

liquid hydrocarbons. This study focuses on pulsed detonation engine operation enhancements using dualdetonation-tube, concentric-counterflow heat exchangers to elevate liquid hydrocarbon fuel temperatures up to supercritical levels. Variation of operating parameters includes fuel type (JP-8, JP-7, JP-10, RP-1, JP-900, and S-8) and firing frequency. Of interest is the effect on ignition time, deflagration to detonation transition time, detonation distance, and the percent of ignitions resulting in a detonation (detonation percentage). Except for JP-10, results for all fuels with increasing fuel injection temperatures indicate decreases in deflagration to detonation transition time by up to 15%, decreases in detonation distance by up to 30%, increases in the detonation percentage by up to 180%, and minimal impact on ignition time. JP-10 is difficult to detonate and results are inconsistent. An increase in firing frequency results in a 5% decrease in deflagration to detonation transition time at high fuel injection temperatures, but has little effect on ignition time and detonation distance.

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