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Summary. Nitric oxides are the only components from the harmful ones limited by the legislation found in the exhaust gases of the hydrogen engine. For the purpose of their minimization and prevention of the anomaly burning processes as well (detonation combustion, early ignition, back fire), the use of the leaked hydrogen-air mixture is offered. The influence of the exhaust gas recirculation (EGR) on the intra-cylindric processes, namely on formation of nitric oxides in the hydrogen engine is studied for the first time experimentally and with the help of the mathematical model based on the three-dimensional non-stationary equations of type of Navier-Stokes. The results obtained for the wide ranges of variation of the advance angle of ignition, excess air ratio and rate of EGR confirm that at successful combination of these controllable parameters the problem of minimization of nitric oxides exhausted by the hydrogen engine is removed.

In this paper, the results of modeling of the burning process in the piston engines whose working process is realized on the basis of various conceptual approaches are presented: in diesel with direct injection of the fuel; in a gas engine with spark ignition; and in a two-fuel engine (in the gas-diesel), where the mixture of natural gas and air ignites with the help of the fuse dose of the diesel fuel. The models of burning based on the different in-principle approaches are analyzed and used. Verification of the models is performed by a comparison of the results of modeling with the experimental diagrams. The specific values of the empirical coefficients, used in modeling of the burning process in the engines under study, are determined. The practical recommendations on the choice of the burning model depending on the working process conception are given.

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