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مکانیک::
قطره
The unsteady liquid-fuel jet phenomena-atomization, liquid jet and droplet motion, fuel vaporization, air entrainment, fuel-air mixing, and the ignition chemistry-all play a role in the heat-release process (see Chap. 10).
Mixture preparation can be limited by the availability of either fuel vapor or air, the former limited by droplet evaporation and the latter by air entrainment.
^ is a source term representing the production of turbulence by the motion of fuel droplets in situations where fuel sprays are important.
The fuel is injected as liquid, it atomizes into a large number of small droplets with a wide spectrum of sizes, the droplets disperse and vaporize as the spray moves through the surrounding air, droplet coalescence and separation can occur, gaseous mixing of fuel vapor and air then takes place, followed, finally, by combustion.
Two such classes of model exist, usually called the continuum droplet model (CDM) and the discrete droplet model (DDM).
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