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。
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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