1968-02-01

The Ignition of Hydrocarbon Fuel Droplets in Air 680465

The ignition of single fuel droplets in air is modeled according to the time-varying conditions within the droplet and the boundary layer around the droplet. Ignition is hypothesized when some point in the boundary layer has experienced a sufficiently severe history in terms of pressure, temperature, equivalence ratio, and time to auto ignite. Experiments were conducted with a wide variety of fuels to validate the model. A critical size concept for ignition was predicted by the model and substantiated by the experiments.

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