湍流模型和壁面函数对有障碍半开口空间氢气燃烧模拟的影响

Influence of turbulence model and wall function on the simulation of hydrogen combustion in a semi-confined space with obstacle

为了进一步验证有障碍半开口空间内氢气燃烧数值模拟的准确性,使用对比验证的方法对FLUENT软件湍流模型和壁面函数数值模拟结果的准确性进行了研究。研究结果表明:可实现k-ε湍流模型和非平衡壁面函数使燃烧压力和火焰形状与实验结果相比偏差较大,RNG k-ε湍流模型和可伸缩壁面函数可更准确地预测燃烧压力变化及火焰传播行为。

In order to further validate the accuracy of numerical simulation results of hydrogen combustion in semi-open space with obstacles,a comparative validation method is used to study the accuracy of numerical simulation results of the turbulence models and wall functions in FLUENT software.The results show that the realizable k-εturbulence model and the non-equilibrium wall function make the combustion pressure and flame shape more deviated from the experiment results.The RNG k-εturbulence model and scalable wall function can more accurately predict combustion pressure change and flame propagation behavior.