飞机发动机防冰对飞行安全具有十分重要的意义，对于热气防冰系统，前缘防冰器的结构型式对防冰的效果影响很大。
The results indicate that the structure of frontal anti icer affects anti icing effectiveness obviously for a hot air anti icing system, the double skin chord direction anti icer I.
装在内燃发动机内的小电热器，用以预热气缸内的空气以利发动，尤用于柴油发动机。
A small electric heating element in an internal-combustion engine that facilitates starting by preheating the air in a cylinder and is used especially in diesel engines.
此外气门头易于被通过的热气体燃烧，这有可能使活塞频繁冲击打开的气门，使发动机严重损坏。
Also the valve heads will be liable to be burnt by the passing hot gases, and there is the likelihood of the piston crown touching an open valve, which can seriously damage the engine.
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