The prediction performance of design fire curves is numerically investigated for tunnel fire using the fire dynamics simulator (FDS). A large eddy simulation (LES) was adopted in the simulation of a previous 750 kW tunnel fire experiment. Based on the experimental heat release rate, t²-fire growth, quadratic and exponential design fire curves (DFCs) are mathematically constructed and adopted in the FDS simulation. The predictions of each DFCs are compared against the experimentally measured smoke temperature, smoke travel time, and carbon monoxide (CO) concentration. In addition, the prediction performance of the mixture fraction (MF) and mixing controlled fast chemistry (MCFC) combustion models, is compared. The simulation results of the MF and MCFC models are similar except for the CO concentration features. For the performance of the DFCs, t²-fire growth curve with the MF combustion model is the most effective combination, which demonstrated the most reasonable agreement with the experimental data.

使用火灾动力学模拟器（FDS）对隧道火灾的设计火灾曲线的预测性能进行了数值研究。在先前的750 kW隧道火灾实验的模拟中，采用了大涡模拟（LES）。根据实验放热率t ²-火灾增长，二次和指数设计火灾曲线（DFC）是数学构造的，并在FDS仿真中采用。将每种DFC的预测值与实验测量的烟雾温度，烟雾传播时间和一氧化碳（CO）浓度进行比较。此外，还比较了混合比例（MF）和混合控制的快速化学（MCFC）燃烧模型的预测性能。MF和MCFC模型的模拟结果相似，除了CO浓度特征不同。对于DFC的性能，MF燃烧模型的t ² -fire增长曲线是最有效的组合，与实验数据最吻合。