柴油机在起动后的暖机过程中排出大量含有未燃碳氢(HC)的蓝烟，给人类健康和社会环境都带来极大的危害。
When direct injection diesel engines are warmed up after running from cold start, they will emit a lot of blue smoke containing unburned hydrocarbons (HC) which are harmful to people and environment.
详细阐述了火花点火式发动机气缸内未燃碳氢排放的主要生成源和形成机理，并测量了不同运转参数下火花点火式发动机的碳氢排放。
In this study, in-cylinder Unburned HC formation mechanism and its major sources in si engine are clarified in detail and HC emission under different operating parameters are measured.
基于火焰传播过程建立了火花点火发动机顶环岸间隙处未燃碳氢生成和释放过程的数学模型，并利用模型进行了顶环岸间隙处未燃碳氢生成过程的数值模拟计算。
In this paper, based on flame propagation a mathematical model of formation and desorption of unburned hydrocarbon in top-land crevice of spark ignition engines has been established.
这些反应增加了不完全燃烧的可能性，更有可能释放未燃尽和光化学活性碳氢化合物到大气中。
These reactions increase the probability of incomplete combustion and are more likely to release uncombusted and photochemically active hydrocarbon compounds into the atmosphere.
碳氢化合物(HC)像一氧化碳一样，为未燃尽的和被浪费掉的燃料。
Hydrocarbons (HC), like carbon monoxide, represent unburned and wasted fuel.
碳氢化合物(HC)像一氧化碳一样，为未燃尽的和被浪费掉的燃料。
Hydrocarbons (HC), like carbon monoxide, represent unburned and wasted fuel.
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