Research on prediction of smoke-free and low-temperature zone in tunnel under conditions of moving fire source at different heights
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
万方数据
维普
