The diesel engines are compression ignition engines. The diesel engine uses the heat of compression to ignite the fuel.

柴油机和汽油机一个主要区别是柴油机的压缩比非常高。

youdao

In a diesel engine, there is no spark plug. Instead, diesel fuel is injected into the cylinder, and the heat and pressure of the compression stroke cause the fuel to ignite.

柴油发动机内没有火花塞，取而代之的是将柴油喷入发动机气缸，然后压缩冲程在高温高压下引起燃料点火。

youdao

In the compression process take away heat generation of compression.

在压缩过程中带走压缩产生的热量。

youdao

So if you've got to pump that tire really a lot, then you're going to you're going to really feel a lot of heat there. The compression of the basically it's an adiabatic compression.

所以若果你给轮胎，打了很多的气，你会觉得你感觉,阀门那儿非常的烫，这种压缩,基本上是一个绝热的压缩。

麻省理工公开课 - 热力学与动力学课程节选