液氢泄漏扩散行为的数值及实验研究

Numerical and experimental study on leakage and diffusion behavior of liquid hydrogen

针对液氢持续泄漏扩散场景,基于SLAB模型,建立液氢泄漏扩散理论模型,开展3 m^(3)液氢泄漏扩散实验,结果表明,液氢在持续泄漏时,会形成液氢地面发展、氢空云团抬升、稳定烟羽3个阶段。稳态烟羽状态时,可视云团在下风向5 m处开始抬升,云团厚度最大达到10.9 m,数值计算结果云团厚度在下风向15 m处接近实验结果,并分析了数值计算结果偏差的原因,对比表明,该模型能够计算液氢持续泄漏后的扩散行为、危险边界的范围及浓度分布,在液氢泄漏扩散行为快速预测方面具有一定的可行性。

For the scenario of continuous liquid hydrogen leakage and diffusion,based on the SLAB model,a theoretical model of liquid hydrogen leakage and diffusion is established,a 3 m^(3) liquid hydrogen leakage and diffusion experiment is carried out,and the experimental study con-cludes that when liquid hydrogen is continuously leaking,three phases of liquid hydrogen ground development,hydrogen-air cloud lifting and stabilized plume will be formed.The steady plume status is reached at 36 s in this experiment,and the lifting starts at 5 m along the downwind direc-tion.The thickness of the cloud reaches 10.9 m.The numerical calculation results show that the cloud thickness approaches the experimental results at 15 m downwind,and the reasons for the deviation of the numerical calculation results are analyzed,and the comparison shows that the model is able to calculate the diffusion behavior of the continuous liquid hydrogen leakage,the range of the hazardous boundary and the distribution of the concentration,and has a certain de-gree of feasibility in the rapid prediction of the diffusion behavior of the liquid hydrogen leakage.It has certain feasibility in the rapid prediction of liquid hydrogen leakage and diffusion behavior.