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مکانیک::
آزادسازی حرارت
The fuel distribution, mixing, and heat-release patterns in the cylinder are highly nonuniform during the soot-formation process, and the details of gas motion in the vicinity of the sampling location as the piston changes position are usually unknown.
The radiation flux has approximately the same shape and time span as the net heat-release rate curve (which was determined from the cylinder pressure curve).
Figure 12-12 shows surface heat fluxes at two locations in a medium-swirl DI diesel, one over the piston bowl (higher heat flux) and the other over the piston squish area, in relation to the heat-release profile.
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).
This section reviews the important features of single-zone heat-release models and phenomenological jet-based combustion models.
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