Flow field studies of 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 flush-wall fuel injector at Mach 2.0 airflow. The goals were to examine the flow structure in the near-field region of 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 oxide (NO) trace probe molecule, while for the reacting experiments, naturally occurring hydroxyl (OH) 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 gas-dynamic flame-holding potential. It was also shown that an igniter torch system could be incorporated without adversely affecting the tailored flow structure.
