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本文论述柴油机热力计算数值方法的理论基础,导出了热力计算的基本微分方程;引进了瞬时过量空气系数和纯残余废气系数的概念,并证明在均匀混合的前提下,进气期间的瞬时过量空气系数的微分方程是可以积分的,从而减少热力计算所需微分方程的个数。此外,采用G.Woschni等人关于当量燃烧曲线的概念,指出可以由单缸试验所测得的功率,比油耗和最高燃烧压力的数值,运用求解非线性代数方程组的一般方法来优选当量燃烧曲线,使热力计算更接近于实际情况。
In this paper, the theoretical basis of the numerical method for thermal calculation of diesel engine is discussed, and the basic differential equation of thermal calculation is derived. The concepts of instantaneous excess air coefficient and pure residual exhaust coefficient are introduced. It is also proved that under the premise of uniform mixing, The differential equations of the coefficients can be integrated to reduce the number of differential equations required for thermodynamic calculations. In addition, adopting the concept of equivalent combustion curve of G. Wooschni et al., We point out that the values of power, specific fuel consumption and maximum combustion pressure which can be measured by a single cylinder test indicate the normal combustion with the general method for solving nonlinear algebraic equations Curve, so that the thermal calculation closer to the actual situation.