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4.火花塞的热值 (1)热值的定义 火花塞处于发动机汽缸内的高温气体中,气体温度达2000℃以上。如果火花塞不能把从燃烧气体中吸收的热量散掉的话,其本身就要熔化,所以它必须把热量迅速地散出。散热快的火花塞温度难以上升,一般称为冷型火花塞。 所谓热值,就是表示火花塞散掉在发动机燃烧室里所吸收热量的程度,它表明了火花塞的热特性,见图204。
4. The calorific value of the spark plug (1) The definition of calorific value The spark plug is in the high temperature gas in the cylinder of the engine, the gas temperature reaches above 2000 ℃. If the spark plug can not dissipate the heat absorbed from the combustion gases, it itself melts, so it must dissipate the heat quickly. Spark plugs fast cooling temperature is difficult to rise, commonly known as cold spark plugs. The so-called calorific value, is that the spark plug dissipated in the engine combustion chamber to absorb the heat level, which shows the thermal characteristics of the spark plug, shown in Figure 204.