Flowfield studies of a diamond-shaped fuel injector in a supersonic flow
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Studies were performed to characterize the flow structure and the mixing characteristics of a diamond-port flushwall fuel injector at Mach 2.0 airflow. The goals were to examine the flow structure in the near-field region of the diamond- and circular-port injectors and to quantify the effects of igniter torch flow on the near-field flow structure with and without torch gas. Planar laser-induced fluorescence was used to document the flow trajectories and the injector-barrel shock shape for the injectors. For the inert mixing studies, the flow was seeded with a nitric-oxidetrace probe molecule, whereas for the reacting experiments, naturally occurring hydroxyl was used. The present experiments confirmed recent computation results that implied that under certain conditions, a diamond-shaped injector port could be tailored to improve mixing and produce an additional secondary flow structure with gasdynamic flame-holding potential. It was also shown that an igniter torch system could be incorporated without adversely affecting the tailored flow structure. Copyright 2007 by the American Institute of Aeronautics and Astronautics, Inc.