Based on the 175F type swirlprechamber air cooling diesel engine, through redesigning cylinder head and piston etc. , new 175F type direct injectionair cooling diesel engine is formed.
Secondly, the diesel engine steady and transient experiments for airinjection were made respectively, the test conditions of which were determined according to the data of the Wuhan bus road test.
The turbulent flow characteristics in cylinders of direct injectiondiesel engine under different air swirl ratios are analyzed by multi dimensional simulation methods.