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【期刊论文】稳定线性热分层环境下火灾烟气羽流积分解及实验分析
袁宏永, Fang Jun, Shu Xueming, Yuan Hongyong, Zheng Xin
中国工程科学,2004,6(1):37-43,-0001,():
-1年11月30日
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。
稳定线性热分层环境, 火灾烟气羽流, 积分解, 实验分析
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袁宏永, ZHAO Jian-hua, YUAN Hong-yong, SU Guo-feng, FAN Wei-cheng
激光与红外,2000,30(5):277-279,-0001,():
-1年11月30日
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。
激光散射, 烟雾浓度, 粒径, 火灾探测
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59浏览
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袁宏永, SHU Xue-ming, SU Guo-feng, YUAN Hong-yong, SHAO Quan
光散射学报,2004,16(3):237-241,-0001,():
-1年11月30日
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。
光散射, 激光图像, 火灾探测, 烟雾粒子
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62浏览
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【期刊论文】A Study on the Vibration of the Charging Belt in an Electrostatic Accelerator
袁宏永, ZHAN Fu-ru, YUAN Hong-yong, FAN Wei-cheng, YU Zeng-liang
Plasma Science & Technology, Vol 3, No.4 (2001),-0001,():
-1年11月30日
The vibration of the charging belt in an electrostatic accelerator has intense influ-ences on the accelerator operation. A calculating model was set up in this paper to study the belt vibration. The results show that the belt tension, belt velocity and belt current all contribute to the belt vibration. There IS an optimal relationship among the three factors by which the belt would run most smoothly. There exists a minimum value of optimal tension for various belt velocities. The vibrating frequency of the is generally around several Hz.
charging belt, vibration, tellsion
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【期刊论文】An automatic fire searching and suppression system for large spaces
袁宏永, Tao Chen, Hongyong Yuan*, Guofeng Su, Weicheng Fan
Fire Safety Journal 39(2004)297-307,-0001,():
-1年11月30日
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.
Automatic fire monitor, Fire searching, Fire suppression, Large spaces
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