通过求解三维定常雷诺平均的N-S方程，对NexGen燃烧器的出口流场进行数值模拟。首先，利用冷态流场的实验数据验证燃烧器几何模型和数值计算方法的有效性。然后，在计算中分别选取火焰面模型、混合分数PDF模型和涡耗散模型三种燃烧模型，比较燃烧模型对燃烧器出口流场模拟结果的影响。研究结果表明，燃烧模型对NexGen燃烧器出口的速度场、火焰形状和热流密度分布基本没有影响，但是对火焰长度、火焰最高温度、最高热流密度及校准面上温度分布和温度值有较大影响。相比火焰面模型和涡耗散模型，混合分数PDF模型的计算结果与实验结果吻合较好，可以为防火试验方案设计提供参考。

The exit flow field of NexGen burner is simulated by solving the N-S equation of the three-dimensional steady Reynolds average. First, the experimental data of cold flow field was used to verify the validity of the geometrical model and calculation method. Then, study the effects of combustion medels on the simulation results of the exit flow field of NexGen burner by computing with flamelet model, mixture fraction PDF model and eddy dissipation model respectively. The results show that the combustion models have no effect on velocity profile, flame shape and heat flux distribution, but have a great effect on the flame length, maximum temperature, maximum heat flux and the temperature distribution and temperature values of the calibration surface. The computed results of mixture fraction PDF combustion model are in good agreement with experimental results compared with flamelet model and eddy dissipation model, which can provide reference for the design of fire test program.

TK233.23

中国民航大学科研启动基金项目（No.2014QD06X）