Smoke induced flow in two rooms mechanically ventilated and linked with a horizontal vent type opening

P. Hugues, Varrall Kevin, Audouin Laurent, V. Olivier
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引用次数: 5

Abstract

This work deals with smoke movements between two mechanically ventilated compartments interconnected by a vent. Based on large scale fire tests, it discusses the effect of vent flow on smoke stratification. The tests concern a 97kW propane fire in a 120m 3 enclosure connected to an adjacent 170m 3 enclosure, both mechanically ventilated. The renewal rate is the varying parameter (from 2.3h -1 to 8h -1 ) typical to operating conditions in nuclear installations. The present contribution investigates the effect of the vent flow on the smoke distribution in both rooms. The temperature and species concentration distributions are analyzed. The effect of ventilation flow rate on the smoke filling and the smoke distribution in both rooms is presented. From mass balance equations, an indirect method is proposed to compute the flow rates at vent (net, upward and downward) only from gas temperatures and species concentrations in both rooms without considering direct measurements at the vent. This indirect method is compared to a direct method (computation of flow rates from spatial integration of temperature and velocity field at the vent cross section). The analysis discusses the application of this indirect method for large scale fire test experiments
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烟雾在两个机械通风的房间中产生,并与一个水平通风口型开口相连
这项工作涉及两个由通风口连接的机械通风隔间之间的烟雾运动。在大型火灾试验的基础上,探讨了通风口对烟气分层的影响。试验涉及在一个120平方米的封闭环境中发生97kW丙烷火,该封闭环境与相邻的170平方米封闭环境相连,两个封闭环境都是机械通风的。更新率是核设施典型运行条件的变化参数(从2.3h -1到8h -1)。本论文研究了通风口流量对两个房间烟气分布的影响。分析了温度分布和物种浓度分布。研究了通风流量对两室烟气填充和烟气分布的影响。根据质量平衡方程,提出了一种间接的方法,仅从两个房间的气体温度和物质浓度计算通风口(净、向上和向下)的流量,而不考虑通风口的直接测量。将这种间接方法与直接方法(通过通风口截面温度场和速度场的空间积分计算流量)进行了比较。分析了该间接方法在大型火灾试验中的应用
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