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特长公路隧道火灾烟气控制是隧道火灾防治的热点及难点问题之一。采用隧道内烟气温度、浓度、压力以及烟气控制范围等静态指标无法综合评估隧道通风排烟时的烟气控制效果,而且存在较高的偶然性和误差率。根据相似理论,搭建了1∶10缩尺寸隧道火灾试验模型,开展了单向排烟和双向排烟模式下20组隧道火灾模型试验,各试验工况下排烟风机处火灾烟气温度随时间呈线性增长趋势,因此将排热效率λ作为评价集中排烟模式下烟控效果的关键参数。结果表明:当排烟阀设置方案相同时,双向排烟模式下的排热效率比单向排烟模式提高5%~10%;排烟阀面积为4~6m2,开启个数为4、6时,排热效率较高。
Fire tunnel flue gas control is one of the hot and difficult issues of tunnel fire prevention and control. The flue gas temperature, concentration, pressure and the control range of flue gas in the tunnel can not comprehensively evaluate the flue gas control effect when tunnel ventilation and smoke exhausting, and there are higher chances and error rates. According to the similarity theory, a 1:10 scale tunnel fire test model was set up and 20 groups of tunnel fire model tests were carried out in one-way smoke exhaust and two-way smoke exhaust mode. Under each test condition, the flue gas temperature at exhaust fan over time A linear trend of growth, so heat efficiency λ as a key parameter to evaluate the smoke control effect of centralized smoke mode. The results show that the exhaust heat efficiency in bidirectional exhaust mode is increased by 5% -10% compared with that in unidirectional exhaust mode when the exhaust valve settings are the same; exhaust valve area is 4 ~ 6m2 and the opening number is 4,6 , High heat discharge efficiency.