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设计与搭建了一套细水雾热遮蔽系统,研究了细水雾衰减目标热辐射的实际过程,分析了影响细水雾热遮蔽效果的内、外部因素。研究发现,0.71 mm大口径喷嘴的热遮蔽效果好于0.41 mm口径喷嘴;细水雾厚度越大对目标热辐射的衰减效果越好,但从减小目标与背景的辐射对比度的角度考虑,而是存在最佳水雾厚度值;采用向上喷射的方式比向下喷射具有更好的热遮蔽能力;对于向上喷射的细水雾,其不同高度上热遮蔽能力是不同的,表现出了随高度先增后减的趋势;风的存在,破坏了雾场并加速了雾滴蒸发,对细水雾的热遮蔽能力具有明显的减弱作用。
A set of water mist shielding system was designed and constructed. The actual process of water mist attenuation target heat radiation was studied. The internal and external factors affecting the thermal shadowing effect of water mist were analyzed. The results show that the heat shielding effect of the 0.71 mm large-diameter nozzle is better than that of the 0.41 mm nozzle. The greater the thickness of water mist, the better the attenuation effect on the target thermal radiation. However, from the perspective of reducing the contrast of radiation between the target and the background, There is the best value of the water mist thickness; spraying upward has better heat shielding ability than downward spraying; for the water mist spraying upward, the heat shielding ability is different at different heights, The first increase and then decrease the trend; the presence of wind, destroyed the fog field and accelerated the evaporation of droplets, the thermal shadowing ability of water mist has a significant weakened effect.