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مخلوط استوکیومتری
A useful comparison with these soot concentrations is the fuel concentration in a stoichiometric mixture, about 75 g fuel/m3.
Under diesel engine conditions, the 02 partial pressure can be high (~ several atmospheres), as can the temperatures of close-to- stoichiometric mixtures ( <2800 K).
(a) Plot the formation rate of NO as a function of the equivalence ratio at 3000 K and 5.5 MPa, and as a function of temperature for a stoichiometric mixture at
(c) If the stoichiometric mixture inducted into the engine reaches 3000 K and 5.5 MPa after combustion, in the absence of any exhaust gas recirculation, calculate the percentage of the exhaust that must be recycled to the intake (at the initial intake temperature) to reduce the NO formation rate by a factor of 4 (assume the final pressure 5.5 MPa stays the same; of course, the final temperature decreases as the exhaust gas is recycled).
Maximum heat fluxes occur with close-to- stoichiometric mixtures.34,35 All these trends would be expected from the variations in burned gas temperature that result from these changes in engine operation.
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