In order to understand the propagation law of fire smoke in tunnel under the conditions of moving fire source at dif-ferent heights,the FDS full-scale numerical simulation was used to simulate the whole process of smoke propagation in tunnel with moving fire source.Using the method of dimensional analysis,the length of smoke-free and low-temperature zone and the functional relationship between the dimensionless fire source power and dimensionless moving speed of fire source were ana-lyzed,and the numerical simulation data was processed and analyzed.The results show that the faster the moving speed of fire source,the longer the length of smoke-free and low-temperature zone.The higher the height of fire source,the shorter the length of smoke-free and low-temperature zone.The length of the smoke-free and low-temperature zone has a non-linear rela-tionship with the 1/3 power of dimensionless fire source power and the dimensionless moving speed of fire source,and a pre-diction model on the length of smoke-free and low-temperature zone in tunnel fires was established further.The research re-sults can provide theoretical support for the evacuation path planning of personnel after fire and the design and optimization of tunnel ventilation system.
tunnel firemoving fire sourcedimensional analysissmoke evolution law
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