Based on the 175F type swirlprechamber air cooling diesel engine, through redesigning cylinder head and piston etc. , new 175F type direct injection air cooling diesel engine is formed.

在175F涡流预燃室风冷柴油机的基础上更换气缸盖、活塞等零件，改成新的175F直喷式燃烧室风冷柴油机。

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Secondly, the diesel engine steady and transient experiments for air injection were made respectively, the test conditions of which were determined according to the data of the Wuhan bus road test.

其次，本文根据武汉市公交车道路试验采集的路谱数据研究成果确定试验工况，分别对柴油机进行稳态及瞬态补气试验。

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The turbulent flow characteristics in cylinders of direct injection diesel engine under different air swirl ratios are analyzed by multi dimensional simulation methods.

用三维数值模拟的方法研究了不同涡流比下直喷式柴油机缸内湍流流动的规律。

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