柴油机和汽油机一个主要区别是柴油机的压缩比非常高。
The diesel engines are compression ignition engines. The diesel engine uses the heat of compression to ignite the fuel.
设计了不同参数的燃烧室，研究了不同压缩比(13 ~ 19)和燃烧室形状对柴油机燃烧及HC排放的影响。
Effects of different compression ratios (13 ~ 19) and designed combustion chamber shapes on combustion and HC emissions were studied.
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