Abstract
Despite the very short flow duration, it is possible to conduct direct-connect combustor experiments in impulse facilities by using an unstarted converging-diverging nozzle located in the freestream flow. Such an unstarted inlet contains a very large subsonic region, which would be expected to require considerable time to establish and reach steady flow. Pressure measurements indicate that steady flow was achieved after approximately 1.5 ms of freestream flow, which at low tunnel enthalpies leaves sufficient time for meaningful combustor measurements to be made before driver gas arrival.
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