对稳定线性热分层环境下湍浮力羽流无量纲积分方程首次采用数值解法进行求解，得出浮力通量、动量通量等参量在轴线上的变化规律以及羽流中性浮力点的高度和羽流最大上升高度。2种不同尺度空间及不同烟气羽流出口条件的实验表明，实际火灾烟气羽流最大上升高度与理论计算结果及文献经验公式相符，从而表明积分模型数值解的有效性，并为高大空间火灾烟气输运规律研究及探测技术发展提供了理论及实验依据。

烟雾是火灾的前兆和伴随产物，是火灾过程中的重要物理现象。烟雾浓度和平均粒径是烟雾的两个重要特性参数，是早期火灾探测的基础。本文对激光与烟雾相互作用进行了具体分析，提出了一种基于激光消光法和角散射法，同时探测烟雾的浓度和平均粒径的方法。本方法可用来进行早期火灾的探测报警，能克服传统的光电感烟探测技术存在的缺点，大大提高火灾探测的可靠性和灵敏度。

本文结合火灾探测领域的特点，分析了火灾烟雾粒子的光散射特性。通过与其他类型的光电感烟火灾烟雾探测技术的比较，阐述了基于光散射的火灾烟雾粒子激光图像探测技术的原理、特点和技术优势。

An automatic fire searching and suppression system with remote-controlled fire monitors for large spaces is developed. The fire searching method is realized based on computer vision theory via one CCD camera fixed at the end of a fire monitor chamber. While the fire monitor is pivoting, continuous images are taken from the CCD camera and transmitted into a computer. Then the images are processed with an image fire detection method to determine whether a fire occurs in the vision field. Once a fire is detected, it will be automatically located through an image processing algorithm. Displacement and pivot angle of the CCD camera in searching process are the essential parameters to calculate the space coordinates of a fire. When the coordinates of the fire are obtained, the fire monitor can be adjusted to the appropriate direction and elevation to spray according to water pressure.

In this work, by carefully calculating the different Knudsen numbers, the free molecular and continuum regimes of flaming combustion were first explicitly defined as the soot particle growth zone low in the flame and the upper zone near the ambient air in the plume respectively, and the fractal coagulation theory was applied to analyze the soot particle agglomeration in the two cluster-cluster aggregation-dominating regions. The accurate analytical simplicity solution obtained proved that self-preserving size distribution (SPSD) exists in the two regions. Additionally we got the relation between the normalized number concentration of the total particle aggregates and the dimensionless time as well as the actual lag-time from monodisperse distribution to SPSD. The results indicate that the fractal morphology of the soot particles affects the particle coagulation process to a large extent, especially has a great influence on soot particle SPSD, total aggregates number concentration in the growth region and the time needed from monodisperse distribution to SPSD above the flame region near the air conditions. The validation of our theoretical results was verified in comparison with previous work and our experimental results.