氢泄漏稳定扩散场数值模拟与回归建模研究

Stable diffusion modeling of hydrogen leakage based on numerical simulation and regression analysis

研究了室外无风环境下高压储氢容器泄漏稳定扩散问题。首先应用组分传输模型以及计算流体力学软件FULENT的Realizable湍动能-耗散率(k-ε)模型对泄漏扩散过程进行模拟和数值仿真,得出了泄漏口附近稳定扩散对称面氢气浓度分布图。在此基础上,对仿真获得的扩散浓度数据,采用依次针对射流方向和射流垂直方向进行回归分析的方法,建立了10MPa压力储氢容器漏孔直径为1mm时泄漏稳定扩散场的参数模型。结果表明,数值模拟计算与理论预测的流场基本吻合,而稳定扩散场的参数模型反映了数值仿真结果,并具有一定的推广能力。

The research on stable diffusion of high pressure hydrogen tank leakage in the non-air-flow open circumstance was conducted. Firstly, the component transport equation and the realizable turbulent kinetic energy-turbulent dissipation rate （k-ε） model in the FLUENT software were applied to numerical simulation of the diffusion field of hydrogen leakage, and the hydrogen concentration map of the diffusion field near the leak hole was obtained. Then, through a two-step regression of the simulation data in the jet-flow direction and its perpendicularity, a parameterized diffusion model for the hydrogen leakage from the tank with the pressure of IOMPa and an lmm-diameter hole was built. The results showed that the simulation was identical with the theoretical prediction and the parameterized model was in accordance with the simulation.