不同湍流模型对氢气分布影响的数值研究

研究严重事故下安全壳内氢气分布有利于评估氢气风险。本文采用三维CFD方法对THAI装置HM2试验进行建模，并分别使用代数模型和k-ε模型模拟氢气分层形成以及破坏过程。分析结果表明，CFD模拟结果与实验数据基本符合，在模拟中可观察到氢气分层现象的形成以及水蒸气对氢气分层的逐步破坏与混合过程；在氢气注射阶段，代数模型和k-ε模型的模拟结果接近，能够反映氢气浓度分层的形成过程；在水蒸气注射阶段，代数模型基于半经验的混合长度理论，在模拟装置较复杂几何结构内水蒸气流动对氢气分层的破坏作用时并不十分理想，标准k-ε模型对装置各测点氢气浓度达到一致的时间预测与试验结果较为接近。

Numerical Study on Effect of Different Turbulence Models on Hydrogen Distribution

The hydrogen distribution analysis helps to evaluate hydrogen risk .In this paper ,the T HAI facility HM 2 test was modeled by 3D CFD code .Algebraic and k‐εturbulence models were used respectively to simulate the forming and erosion process of hydrogen stratification .The results agree with the experimental data .In simulation , the process of hydrogen stratification and erosion by steam jet are observed .In hydrogen injection phase ,both turbulence models can describe the stratification process .Howev‐er ,in steam injection phase ,the algebraic model based on semi‐empirical mixing length theory is not ideal to simulate the stratification erosion by steam .The simulation results by k‐εmodel are close to the experimental data .