Research on Fuel Mixing in a Non-reacting Situation Simulating a Dual-mode Combustor

抄録

We investigated the influence of injectant species and air total temperature to mixing characteristics to find out dominant parameters to simulate mixing process in a dual-mode combustor with non-reacting mixing experiment, the combustor being capable to operate can in a ramjet-mode (subsonic combustion) and in a scramjet-mode (supersonic combustion). To evaluate mixing efficiency, Pitot pressure measurement and gas sampling at the several cross-sections were carried out with plural gases (helium, nitrogen, or argon) injected at sonic speed from wall-flushed mounted injectors to M2.5 cold (room temperature) or hot (1000K, 2000K) airflow without or with pseudo-shock wave system. By matching dynamic pressure ratio, the influence of injectant species to mixing characteristics was negligible in ramjet- and scramjet-mode cases, but the influence of air total temperature was not negligible in the ramjet-mode case.