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为研究扁平型空间火灾顶棚射流特性,在一长15 m、宽11 m、高4.6 m的扁平空间内进行了实验与数值模拟,空间内强制通风对火源热释放率为100~500 kW的火灾顶棚射流温度变化影响。研究发现了空间内通风、障碍物和门开口都会对顶棚射流温度产生扰动;通风对顶棚射流降温作用在火源热释放率小于200 kW的火灾场景和远离火源的区域更明显,而通风对上壁面附近最高温度所在位置并没有明显的影响;同时,通风并未改变顶棚射流以近似指数形式降低的规律,但会加速温度的下降速率,可使温度衰减系数最大提高近2倍。
In order to study the jet flow characteristics of a flat-type fire ceiling, experiments and numerical simulations were conducted in a flat space of 15 m in length, 11 m in width and 4.6 m in height. Forced ventilation in space was applied to heat release rate of 100-500 kW Fire ceiling jet temperature changes. The study found that ventilation in the space, obstacles and door openings would cause disturbance to the ceiling jet temperature. The cooling effect of the ventilation on the ceiling jet was more obvious in the fire scene with the heat release rate of the fire source less than 200 kW and away from the fire source, At the same time, ventilation did not change the roof jet to approximate the exponential decline, but will accelerate the rate of temperature decline, the maximum temperature attenuation coefficient can be increased nearly 2 times.