Numerical Simulation of Scram-mode Operation of an Axisymmetric Combustor in an Arc Tunnel

Samuel Richardson, Caleb A. Hash, Paige M. Drummond, Jack R. Edwards, Tonghun Lee, Nozomo Kato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Large-eddy simulations of scram-mode operation of an axisymmetric inlet-isolator-combustor configuration experimentally tested in the University of Illinois’s ACT-II arc-heated combustion tunnel are presented in this work. A 32-species ethylene oxidation mechanism including nitrous oxide formation reactions is used for most calculations; sensitivities due to the use of a 43-species model are also assessed. Numerical flame stabilization under conditions of the experiment (Mach 4.5 inflow, equivalence ratio of 0.82) is sensitive function of the rate of energy release within the combustor. This can be altered by changes in the inflow O atom composition (using values obtained from simulations of the arc heater itself), the choice of reaction mechanism, and the wall-heating level, but even with these controls, it was found necessary to threshold the pressure level supplied to the reaction rates to achieve stable supersonic combustion within the unit. The results presented show a strong sensitivity to these controlling factors in that good agreement with experimental trends can be obtained for specific combinations but the prescription is not unique. The predictions show that scram mode operation occurs under lean premixed conditions, characterized by a predominance of CO, very little formation of CO2, an appreciable temperature rise, and an OH signal that rises substantially prior to increases in the formation rates of the major combustion products.

Original languageEnglish (US)
Title of host publicationAIAA SciTech Forum and Exposition, 2024
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624107115
DOIs
StatePublished - 2024
EventAIAA SciTech Forum and Exposition, 2024 - Orlando, United States
Duration: Jan 8 2024Jan 12 2024

Publication series

NameAIAA SciTech Forum and Exposition, 2024

Conference

ConferenceAIAA SciTech Forum and Exposition, 2024
Country/TerritoryUnited States
CityOrlando
Period1/8/241/12/24

ASJC Scopus subject areas

  • Aerospace Engineering

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