The gas flow and fuel spray status in combustion chamber are two important factors which affect the mixture formation in diesel cylinder.
而气缸或燃烧室内的气流运动和燃料的喷雾特性，是影响柴油机混合气形成和燃烧过程的两大重要因素。
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；
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