Abstract
Flame stability and extinction of a premixed hydrogen-air flame is numerically studied at sub-atmospheric, high altitude flight pressures. A RANS-based model based on an existing model ramjet combustor with a bluff-body at the Propulsion and Energy Research Lab at the University of Central Florida is ran at 3 inlet pressures: 1, .06, and .02 bar. Lean flame blowout is simulated by a transient fuel inlet mass fraction. Local extinction events at the flame front and the transition to lean blowout are studied at sub-atmospheric pressures. The simulations provide an important perspective on the balance of chemical and flow timescales in a lean blowout environment. This study provides new knowledge about flame stability and extinction, allowing for further optimization and development of better combustion systems for high altitude flight.
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