受限空间内液氢泄漏扩散规律研究

Study on leakage and diffusion of liquid hydrogen in confined space

利用CFD软件模拟受限空间内液氢泄漏扩散,通过编译自定义函数(UDF),描述液氢相变过程中的传热、传质及相应计算模型所需的边界条件,得到了不同条件下液氢泄漏过程中温度和浓度的分布情况,分析了风速、泄漏速率、地面温度等对液氢泄漏扩散的影响。结果表明,在泄漏量一定的情况下,增加泄漏速率和提高地面温度可以从空间和时间上减少液氢泄露带来的危害;提供风速条件在空间上扩大了危险区域,但是在时间上减少了危险区域持续时间。

The leakage and diffusion of liquid hydrogen in confined space was simulated by CFD software. The phase and boundary conditions were described by custom function(UDF), the temperature and concentration distribution in process of liquid hydrogen leakage under different conditions were obtained, and the influence of the wind speed, leakage rate, ground temperature on liquid hydrogen leakage and diffusion were analyzed. The results show that:in the case of a certain amount of leakage, increasing the leakage rate and raising the ground temperature are conducive to reduce the harm caused by liquid hydrogen leakage in terms of time and space, and providing wind speed conditions enlarges the danger zone but reduces duration.