On radiative extinction of microgravity diffusion flames

Radiative energy losses induce instability and extinction of low-momentum microgravity diffusion flames. In this work, the critical condition steady flame to exist a correlation for pre-extinction size self-extinguished flames are derived using temperature concept considering balance. With values 1100 K ethylene, 1200 propane, 1300 methane flames, favorable performance is demonstrated in predicting radius spherical (including those observed drop tower tests Flame Design orbital experiment) evaluating effective produced by flat circular burner recently completed BRE (Burning Rate Emulator) space experiment. latter case, radiative fraction at shown agree with estimates based on radiometer data. stability diagram developed experimental database. Analytical dependence nominal heat release oxygen concentration ambient delineate boundary between experimentally (at least until fuel termination) ethylene-fueled