车库内不同车型燃料电池汽车氢泄漏仿真模拟

NUMERICAL SIMULATION OF HYDROGEN LEAKING FROM FUEL CELL VEHICLES OF DIFFERENT TYPES IN GARAGE

为研究不同车型燃料电池汽车的氢泄漏扩散,选取上汽大通FCV90和EUNIQ7两种燃料电池汽车车型,改变车辆停放位置,分析其在半封闭车库发生氢气泄漏后的扩散规律。通过数值模拟发现EUNIQ7发生泄漏后,氢气易在车辆底部聚集,而FCV90发生氢气泄漏后,氢气沿车辆底部向外扩散较快,形成氢气易燃区面积较小,说明燃料电池汽车底盘较高时,氢气泄漏扩散快,逃逸能力强。通过在车库墙壁设置监测点,发现靠近车尾监测到氢气所需时间远小于车库顶部,所以燃料电池汽车停车库内还需在侧墙下方合理布置探测器,进而缩短燃料电池汽车氢泄漏监测时间,有效避免氢泄漏事故。

In order to study the effect of different vehicle types on hydrogen leakage and diffusion in fuel cell vehicles,two types of fuel cell vehicles,FCV90 and EUNIQ7 produced by SAIC MAXUS are selected and their parking positions are changed,the diffusion law of hydrogen in semi-enclosed garage is analyzed.Through numerical simulation,it is found that hydrogen tends to accumulate at the bottom of the vehicle after EUNIQ7 leaks,while the hydrogen diffuses rapidly along the bottom of the vehicle after FCV90 leaks,resulting in a smaller flammable area of hydrogen.It indicates that when the fuel cell vehicle chassis is high,the hydrogen leakage diffuses quickly and the escape ability is strong.By setting monitoring points on the garage walls,it is found that the time required to detect the hydrogen concentration on the wall near the rear of the vehicle is much less than the time required on the top of the garage,therefore,it is necessary to resonably arrange hydrogen concentration detectors on the side walls in the garage,so as to reduce the time of hydrogen leakage monitoring and effectively avoid hydrogen leakage accidents.