稳定、中性条件风速标准差对烟幕扩散的影响

为了更好发挥发烟装备的使用效果,需要研究风速标准差对烟幕扩散的影响规律.通过分析现场观测数据,研究了稳定、中性层结条件下3个方向风速分量标准差与稳定度分类判据SR数及平均风速之间的关系,运用高斯烟羽模式结合实测平均风速和风速标准差计算了烟幕在大气中的扩散效果,分析了平均风速和风速标准差对烟幕有效遮蔽区域长度、高度、面积的影响规律.结果表明,烟幕有效遮蔽区域长度和高度的主导因素分别为垂直方向风速标准差和平均风速;相同的稳定度类别和近似的平均风速条件下,风速分量标准差可能存在较大差别,导致烟幕有效遮蔽区域的长度和面积可能存在量级上的变化.因此,在发烟装备评价和使用过程中,观测并参考风速标准差是很有必要的.

Influence of Standard Deviation of Wind Speed on Diffusion of Smoke Screen under Stable and Neutral Conditions

In order to increase the performance of smoke equipment, it is necessary to investigate the influence of standard deviation of wind speed on smoke diffusion. Relationship between standard deviation of wind speed component in three directions, stability classification criterion SR number and average wind speed under the conditions of stable and neutral stratification was studied by analyzing the field observation data. Combined with measured mean wind speed and standard deviation of wind speed, the atmospheric diffusion effect of smoke screen was calculated by Gaussian plume model. Furthermore, influence of average wind speed and standard deviation of wind speed on the length, height and area of effective shading region of smoke screen was analyzed. It is found that standard deviation of vertical wind speed and average wind speed are main factors of the length and height of effective shading region respectively. Even under the condition of the same stability classification and approximate average wind speed, standard deviation of wind speed component can be significantly different, which may lead to the change of the length and area of the effective shading region in order of magnitude. Therefore, it is necessary to observe and refer to standard deviation of wind speed in evaluation and use of smoke equipment.