Abstract
Starting characteristics of the underexpanded twin jets and reverse flow as a consequence of interaction at high altitudes were experimentally investigated in a High Altitude Jet Simulation Facility. The flowfield characteristics were captured through Schlieren flow visualization. Pitot pressure survey upstream of the jet inflection point showed the existence of reverse flow due to jet interaction. The nature of the reverse flow at higher pressure ratios, in the vicinity of the jet inflection point was supersonic and become lower subsonic near the base. On the other hand, at lower pressure ratios, the reverse flow was subsonic throughout the base region. The reverse-flow Mach number was dictated by the dissipation effect and the vented area shape in the base region. Base pressure measurements confirmed that reverse flow was fully diffused at the base.
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