A Mathematical Model on Nitric Oxide Formation in Diesel Engines

概要

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In this paper, a mathematical model on nitric oxide formation in diesel engines was proposed, and the propriety of this model was confirmed by comparing the calculated results with experimental ones. In this model, the gas in the cylinder was devided for convenience sake into three parts, namely, fresh air, burnt gas and the burning part where a constant pressure combustion of stoichiometric mixture was assumed. Then the gas in the burning part was assumed to mix and dilute to the condition of mean excess air factor according to a time function f(t,τ,m). The nitric oxide was assumed to be produced during this mixing process. And, Zeldovich's mechanism of chain reaction was used in calculation. As a result of the present calculations, a desirable agreement between calculated and measured values was obtained under various operating conditions.
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