Influences of Boundary Conditions on Critical Velocity in Tunnel Fire Model Test
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摘要: 对在火源附近有水喷淋与无水喷淋两种工况进行了小尺寸隧道模型试验,以研究边界条件对隧道火灾模型试验临界风速的影响.结果表明,与无喷淋相比,水喷淋增大了火源附近的对流及辐射热损失,使烟气温度降低,临界风速明显减小.对于小尺寸模型隧道,在火源处采用水喷淋的边界条件比较符合火源附近的壁面换热边界条件,得到的临界风速更合理.Abstract: To investigate the influences of boundary conditions on critical velocity,tunnel fire model test was carried out with and without water spray to cool the tunnel walls near the fire source.The results indicate that water spray increases heat loss due to strong convection and radiation near the fire source,cools down the smoke,and decreases critical velocity.The test results with water spray in a small-scale tunnel agree better with data from full-scale tests,and the critical velocity so obtained is more accurate than those without water spray.
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Key words:
- tunnel fire /
- critical velocity /
- boundary condition /
- water spray /
- model test
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