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；
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.
设计时必须认识到当压力增加时火焰的长度缩短而辐射强度增加。
Design should recognize that burner flame length shortens and intensity of radiation increases as pressure increases.
它代表火焰，热烈和强度。
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