Abstract

The results of study of the working process, the local heat transfer in the combustion chamber, and the thermal state of the piston of a hydrogen engine with an external mixture formation are analyzed. Studies of the local heat transfer coefficients were carried out using a 3D-CRFD-mathematical model developed and verified on the basis of the experimental results, first used to study a hydrogen engine of this type. It has been established that the operation of a hydrogen engine on combustible mixtures of stoichiometric (or close to it) composition is impractical, since it leads not only to abnormal combustion processes and increased emission of nitrogen oxides, but also to an increase in local heat loads on parts, in particular on the piston, the local temperatures of which may exceed acceptable values. It is shown that the use of lean mixtures can prevent undesirable phenomena, in particular, reduce the emission of nitrogen oxides, reduce heat loads, and improve the heat-stressed state of the piston, providing acceptable conditions for the operation of the hydrogen engine.

中文翻译：

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在稀薄燃料混合物上运行的氢发动机燃烧室中的局部热交换

摘要

分析了工作过程，燃烧室内的局部传热以及具有外部混合物形成的氢发动机活塞的热状态的研究结果。使用基于实验结果开发并验证的3D-CRFD数学模型进行了局部传热系数的研究，该模型首先用于研究这种类型的氢发动机。已经确定的是，在化学计量的（或接近化学计量的）成分的可燃混合物上运行氢发动机是不切实际的，因为这不仅会导致异常的燃烧过程和增加的氮氧化物排放，而且还会导致局部热量增加零件，特别是活塞上的局部温度可能超过可接受值的最大载荷。