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研究了倒拖工况下直喷式柴油机气缸盖近壁气流速度场的分布规律，并利用一维传热模型计算了气缸盖近壁的热边界居，得出了气缸盖近壁不同位置的气流速度和热边界层是不同的，速度边界层基本上在压缩中期形成并达到一定厚度，以及热边界层和速度边界层数量级相同等结论。
The distribution of airflow velocity field near the cylinder head of direct injection diesel engine under inverted condition was studied. The thermal boundary of the cylinder head near wall was calculated by one-dimensional heat transfer model. The velocity of the gas flow is different from that of the thermal boundary layer, and the velocity boundary layer is formed to a certain thickness in the middle of compression and the thermal boundary layer and the velocity boundary layer are of the same order of magnitude.