Publication Date:
2019-08-13
Description:
In order to reduce the cost and complexity associated with fuel injection and mixing experiments for high-speed flows, and to further enable optical access to the test section for nonintrusive diagnostics, the Enhanced Injection and Mixing Project (EIMP) utilizes an open flat plate configuration to characterize inert mixing properties of various fuel injectors for hypervelocity applications. The experiments also utilize reduced total temperature conditions to alleviate the need for hardware cooling. The use of "cold" flows and non-reacting mixtures for mixing experiments is not new, and has been extensively utilized as a screening technique for scramjet fuel injectors. The impact of reduced facility-air total temperature, and the use of inert fuel simulants, such as helium, on the mixing character of the flow has been assessed in previous numerical studies by the authors. Mixing performance was characterized for three different injectors: a strut, a ramp, and a flushwall. The present study focuses on the impact of using an open plate to approximate mixing in the duct. Toward this end, Reynolds-averaged simulations (RAS) were performed for the three fuel injectors in an open plate configuration and in a duct. The mixing parameters of interest, such as mixing efficiency and total pressure recovery, are then computed and compared for the two configurations. In addition to mixing efficiency and total pressure recovery, the combustion efficiency and thrust potential are also computed for the reacting simulations.
Keywords:
Spacecraft Propulsion and Power
Type:
NF1676L-27197
,
Joint Army-Navy-NASA-Air Force (JANNAF) December 2017 Meeting; Dec 04, 2017 - Dec 07, 2017; Newport News, VA; United States|Joint Army-Navy-NASA-Air Force (JANNAF) Programmatic and Industrial Base (PIB) Meeting; Dec 04, 2017 - Dec 07, 2017; Newport News, VA; United States|Joint Army-Navy-NASA-Air Force (JANNAF) Exhaust Plume and Signatures (EPSS) Joint Subcommittee Meeting; Dec 04, 2017 - Dec 07, 2017; Newport News, VA; United States|Joint Army-Navy-NASA-Air Force (JANNAF) Propulsion Systems Hazards (PSHS) Joint Subcommittee Meeting; Dec 04, 2017 - Dec 07, 2017; Newport News, VA; United States|Joint Army-Navy-NASA-Air Force (JANNAF) Airbreathing Propulsion (APS) Joint Subcommittee Meeting; Dec 04, 2017 - Dec 07, 2017; Newport News, VA; United States|Joint Army-Navy-NASA-Air Force (JANNAF) Combustion (CS) Joint Subcommittee Meeting; Dec 04, 2017 - Dec 07, 2017; Newport News, VA; United States
Format:
application/pdf
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