Abstract
This study examined the ignition and flameholding effects of the quasi-direct-current discharge on a directly injected hydrocarbon fuel (ethylene) in a supersonic combustion chamber without mechanical flameholders (plane walls). Tests were performed in supersonic wind tunnel SBR-50 at the University of Notre Dame at a Mach number of while varying the air pressure (), an air temperature of , and a fuel mass flow rate of . The sensitivity of the ignition dynamics to the plasma power was also explored. The pressure distribution over the test section, schlieren visualization, and camera imaging were used for combustion intensity and combustion front identification. Optical emission spectroscopy and electrical measurements were employed to characterize the quasi-direct-current discharge. Previously, ignition and flameholding of hydrogen were demonstrated in a wide range of parameters. In the case of ethylene injection, it was shown under current test conditions that lower pressure and lower air temperature were beneficial for flameholding. A preliminary explanation of these unobvious effects is proffered.
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