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本文提出了一种计算模型，它可以预测中速柴油机的能量转化。这是一种紊流束扩散理论的准静态模型，可用来计算燃料与空气的混合。这种混合是直喷式（DI）柴油机燃烧主要阶段能量转化的决定性因素。在燃烧的初始阶段，燃烧过程反应动力学是决定性的，它可用阿列纽斯函数来描述。该函数适于各种发动机、各种运行工况点和各种燃料，其计算结果与测量结果的一致性是令人满意的。需要指出的是，在本研究中，混合速度不是从喷油嘴喷出的速度，而主要是气缸中由活塞平均速度所产生的紊流（涡流）的速度。
This paper presents a computational model that predicts the energy conversion of a medium-speed diesel engine. This is a quasi-static model of turbulent flow diffusion theory that can be used to calculate the fuel-air mixture. This mixing is a decisive factor in the energy conversion of the main stages of direct injection (DI) diesel combustion. The reaction kinetics of the combustion process is decisive in the initial stage of combustion, which can be described by the Arrhenius function. This function is suitable for a variety of engines, various operating conditions and a variety of fuels, the calculated results and the consistency of the measurement results is satisfactory. It should be noted that in the present study, the mixing speed is not the speed of the jet from the nozzle but mainly the speed of the turbulent flow (vortex) in the cylinder resulting from the average piston speed.