共查询到17条相似文献,搜索用时 156 毫秒
1.
2.
综述国内外中庭烟气控制研究现状。讨论了中庭建筑的类型与结构、中庭烟气控制系统、排烟方式、排气效率、烟气填充过程与时间常数、烟气早期分层与烟气探测、控制烟气流动的中庭与相邻空间之间的气流问题以及喷洒系统对烟流的影响等。同时分析了我国现行规范( 高规) 中有关中庭防火设计的规定及存在的问题,并提出今后的研究方向 相似文献
3.
4.
5.
刘小舟 《消防技术与产品信息》2005,(9):11-15
介绍了中庭的火灾特点以及中庭建筑防排烟的现状,分析了中庭建筑烟气流动过程,并且通过结合美国消防协会(NFPA)的商业街、中庭及大空间烟气控制系统设计指南NFPA92B和美国国家建筑规范BOCA中有关中庭烟层界面的预测方法,叙述了中庭建筑烟气控制的方法和中庭烟气控制系统设计计算的一般步骤。 相似文献
6.
利用FDS模拟中庭内的烟气填充过程,分析环境温度、顶棚温度、火源功率、中庭体量对烟气填充高度的影响。通过分析温度数据和烟气层高度数据,得到烟气层高度与各因素之间相互影响的定性关系,并通过曲线拟合得到烟气层高度与各因素之间的定量关系。结果表明,烟气层填充高度基本不受起始环境温度的影响,烟气层高度峰值与顶棚温度、火源功率、中庭体量之间存在线性关系。 相似文献
7.
8.
中庭烟气控制性能化设计 总被引:6,自引:0,他引:6
阐述了"处方式"建筑防火设计和性能化建筑防火设计,介绍国外中庭烟气控制性能化设计方法,在此基础上探讨我国建立中庭烟气控制系统性能化设计的规范和设计指南,提出我国实现中庭性能化设计有待进一步研究和探讨的问题. 相似文献
9.
10.
11.
12.
建筑内步行街是目前大型综合体大多采用的建筑形式,此类建筑的烟气控制方案一直是性能化防火设计的重要组成部分.文章以性能化的设计理念,通过数值模拟的方法,以某工程为例,对其烟气控制方案进行了研究并得出相关结论.文章假设火灾环境下,探究在采用机械排烟的前提下,优化中庭和回廊的排烟效果. 相似文献
13.
中庭作为一个独特的空间形式,在商业广场中对于商业价值起到了延续和传承的作用,构建了一个整体的商业体系,所以对于中庭的设计越来越受到建筑设计师的重视。通过对中庭存在于商业广场中的作用研究,更重要的是从吸引人流的方面考虑,运用灰色系统的方法,预测不同的中庭空间要素对其消费者的空间认知产生作用的程度,并将之按照影响大小顺序进行排序。 相似文献
14.
通过相似模型实验,得到了服装类中庭建筑火灾的火源燃烧发展规律和火源释热率变化规律;分析得到了该类中庭建筑的火灾烟气填充运动规律。 相似文献
15.
The Fire Dynamics Simulator code is used to investigate the smoke movement in an atrium under fire scenario. At first, by comparing with experimental data of the atrium fire under low and high heat release rates, reasonable model constants of Cs and Prt and appropriate grid system are determined for simulating smoke movement in the atrium, the simulation results are in good agreement with those experimental data. Then, the performance of different smoke exhaust methods in the atrium is studied. Smoke filling processes are investigated under different natural and enhanced smoke exhaust methods. Simulated results show that natural smoke exhaust method is preferred when the smoke exhaust vents are located at the ceiling of the atrium. On the other hand, when the smoke exhaust vents are located on the walls of the atrium, the higher positions of the smoke exhaust vents are preferred. In addition, the influence of the fire source locations on the smoke spreading process is presented in this paper, three kinds of fire source locations are studied, they are central fire, side wall fire and corner fire. Results indicate that the descending process of the smoke layer is the slowest when the fire source is at the corner of the atrium. 相似文献
16.
17.
We consider two horizontally connected compartments with four openings and one compartment on fire; the height of one compartment is fixed, while that of the other varies. A simple small-scale experimental study using air was performed to demonstrate the existence of two stable flow solutions at the same height ratio. Moreover, a macroscopic zonal model is used to theoretically analyze smoke flow direction and smoke mass flow rate. Under different ranges of height ratio, four patterns of smoke flow are identified and studied. One of the solutions is unstable, while the other three solutions are stable, as shown by nonlinear dynamic analysis. Therefore, two stable solutions of smoke flow exist at the same height ratio and ambient conditions when the height ratio is larger than a critical value, and the critical value is shown to be a transcritical bifurcation point. The implications of smoke flow bifurcation on smoke control in an atrium or building with a stairwell are also discussed. 相似文献