fuel-lean flame fuel-rich regions 富燃料区
lean flame region 稀火焰区
lean premixed flame 贫油预混火焰
lean pre-mixed flame 贫燃料预混燃烧
The combustion form of rich flame is part-premixed combustion and lean flame is premixed combustion.
浓火焰燃烧形式为部分预混燃烧，淡火焰的燃烧形式为全预混燃烧。
When the CH4-air mixture approaches the lean fuel state, the flame speed accordingly decreases, the flame cone rising and retreating downstream to the area with lower flow speed.
从化学计量向贫燃料状态靠近时，预混火焰强度减弱，火焰传播速度 减小，锥形火焰面逐渐增高，退到流速较低的下游区域；
If the room fills with smoke, lean out of the window unless prevented by smoke and flame coming from a room below or nearby.
如果房间充满烟幕，而且傍边或下面的房间的没有火或烟幕，探诞生体到窗外。
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