受限空间下车载供氢系统氢气泄漏扩散分析
Analysis of Hydrogen Leakage and Diffusion in Onboard Hydrogen Supply Systems Within Confined Spaces
张永涛 1高海宇 2张欣 1严浩华1
作者信息
- 1. 北京交通大学 机械与电子控制工程学院,北京 100044
- 2. 江苏大学 汽车与交通工程学院,江苏,镇江 212013
- 折叠
摘要
针对受限空间内车载供氢系统氢气泄漏后可能导致的安全风险问题,基于Fluent软件对氢燃料电池半挂牵引车在受限空间中进行了氢气泄漏扩散的仿真研究.结果表明,以氢气向后泄漏数据为基准,氢气向上及向前泄漏后,通风口附近氢气浓度平均增加42.38%和99.89%.以泄漏速率为10 g/s的氢气浓度数据为基准,在20 g/s和90 g/s的泄漏速率下,通风口附近氢气浓度平均增加4.68%和127.73%.在一定条件下,通风口面积的增大能使受限空间内氢气浓度降低,但通过增加强制通风装置的方法能更有效地降低通风口附近的氢气浓度.长时间的氢气泄漏后,整个受限空间中的氢气分布逐渐达到平衡,应及时有效地限制氢气泄漏.
Abstract
To address the potential safety risks caused by hydrogen leakage from the onboard hydrogen system in confined spaces,a hydrogen leakage diffusion simulation study was carried out on a hydrogen fuel cell semi-trailer tractor in a confined space using fluent software.The results show that,using the backward hydrogen leakage data as a baseline,the hydrogen concentration near the vent increases by an average of 42.38%after upward leakage and by 99.89%after forward leakage.Taking the hydrogen concentration data at a leak rate of 10 g/s as a benchmark,the hydrogen concentration near the vent increases by an average of 4.68%at a leak rate of 20 g/s and 127.73%at a leak rate of 90 g/s.Under certain conditions,increasing the vent area can reduce the hydrogen concentration in the confined space,but it is far less effective than using forced ventilation near the vent.After a prolonged period of hydrogen leakage,the hydrogen distribution throughout the confined space gradually reaches equilibrium.Therefore,hydrogen leakage should be promptly and effectively restricted.
关键词
氢气/泄漏/数值方法/卡车/受限空间Key words
hydrogen/leakage/numerical methods/trucks/confined space引用本文复制引用
基金项目
国家重点研发计划项目(2021YFB2501503)
出版年
2024
国家科技期刊平台
NSTL
万方数据