The standard deviation of four-nozzle impinging flame noise was greater than that of the two-nozzle impinging flame noise, but the change of the standard deviation was the reverse.

四喷嘴工况的撞击火焰噪声的标准偏差值要大于两喷嘴，但标准偏差随工况的变化小于两喷嘴，说明四喷嘴撞击火焰燃烧剧烈但稳定。

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Combustion of powdered coal in furnace is a very complicate suspension firing process. Noise interference must be overcome to achieve clear image of flame monitoring system.

锅炉中煤粉的燃烧过程是非常复杂的悬浮燃烧，炉膛火焰监视必须克服监视图像的噪声。

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The rocket exhaust plume causes the effects of noise, smoke, flame and heat radiation, environment pollution and signal attenuation, etc. So it is important to study exhaust plume.

火箭羽流会造成噪声、烟雾、热辐射、环境污染和信号衰减等多种效应，因此研究排气羽流问题至关重要。

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