Mixing and Ignition of Enclosed Supersonic Diffusion Flames.
Final rept. Jul 70-Jul 72,
CRANFIELD INST OF TECH (ENGLAND)
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An experimental study has been made of the effect of combustor geometry on the ignition and combustion of enclosed supersonic diffusion flames. A short film was made of a hydrogen supersonic diffusion flame within a quartz combustor, which indicated that the heat release was uniform and shock free, but that an unusual shock formation was produced just before choking occurred. Kerosene and methane were ignited in an air-flow of Mach number 2, stagnation temperature approximately 1950K and static pressure 14.7 p.s.i.a., conditions in which autoignition would not normally occur by adding a very small amount of hydrogen to the flow. The amount of hydrogen necessary to produce autoignition of the hydrogen fuels decreases with increasing pressure ratio. The ratio of the amount of hydrogen necessary to produce ignition, to the amount of hydrocarbon fuel was given. It is proposed that the flow disturbance created by radial injection of fuel is similar to that produced by a solid body in the flow. Modified author abstract
- Combustion and Ignition