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مکانیک::
مخلوط نسوخته
The gas pushed into the crevice ahead of the flame is unbumed mixture; the gas pushed in behind the flame is burned mixture.
(14.34), which describes the rate of change of unburned mixture mass p within the flame zone, the first term represents the turbulent convection of unbumed mixture across the spherical front of the flame and the second term represents the mass rate of burning of entrained but not yet burned mixture which is contained within the "wrinkles" and "islands," which the distorting and stretching of the thin reaction sheet by the turbulent flow produces.
These elements may be air (plus residual), liquid fuel, unbumed mixture (fuel vapor, air, burned gas), and burned mixture
Since the burned gases dilute the unbumed mixture, the absolute temperature reached after combustion varies inversely with the burned gas mass fraction.
Both EGR and excess air dilute the unbumed mixture.
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