...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Combustion and Flame >Flame interactions and smoke containment by downward displacement ventilation
【24h】

Flame interactions and smoke containment by downward displacement ventilation

机译：向下排风的火焰相互作用和烟雾抑制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Smoke contamination even from small fires of sensitive components in telephone central offices (TCO) and semiconductor clean rooms has caused disastrous disruptions in services and excessive financial repercussions. Containment and removal of smoke can be achieved by downward displacement ventilation, also used for other purposes in large floor area semiconductor facilities. Downward ventilation reverses the upward flow from the fire and removes the smoke and other combustion products through the floor. Small-scale model experiments under turbulent fire plume conditions investigate the physical parameters such as downward velocity, ceiling clearance, and size of the fire that control the extent of the smoke containment around the fire. The extent of smoke contamination is mapped by measuring the temperatures in several locations on the vertical axis and in the space around the fire. The downward velocities cause oscillation of the fire plume and the flames around the vertical axis. By combining the experimental data with similarity analysis, a characteristic length scale and nondimensional relations are deduced for the extent of the smoke containment and the onset of plume oscillations. These relations allow design of displacement ventilation effective to contain the smoke but not cause fire spread owing to the leaning of the flames. Previously reported discrepancies in the apparent width and behavior of the plume are resolved by examining the experimental data and assessing the suitability of steady state computational fluid dynamics to model the present flow.
机译：电话中心办公室（TCO）和半导体无尘室中敏感组件的小火甚至引起烟雾污染，也造成了灾难性的服务中断和过度的财务影响。向下排风可实现烟雾的控制和清除，向下排风也可用于大面积半导体设备中的其他目的。向下通风逆转了火势的向上流动，并通过地板清除了烟雾和其他燃烧产物。在湍急的火羽条件下进行的小型模型实验研究了物理参数，例如向下的速度，顶棚净空和火的大小，这些参数控制着火周围烟气的扩散程度。通过测量垂直轴上多个位置以及火周围空间中的温度来绘制烟雾污染的程度。向下的速度会引起火焰和垂直轴周围的火焰振荡。通过将实验数据与相似性分析相结合，推导了特征性长度标度和无量纲关系，用于烟气遏制的程度和羽流振荡的发生。这些关系允许设计置换通风以有效地抑制烟雾，但不会由于火焰的倾斜而引起火势蔓延。通过检查实验数据并评估稳态计算流体动力学对当前流量进行建模的适用性，可以解决以前报告的羽流表观宽度和行为差异。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号