高压储氢气瓶的长径比和进气口直径对其快充温升及温度分布的影响

THE INFLUENCES OF L/D RATIO AND INLET DIAMETER ON THE TEMPERATURE RISE AND TEMPERATURE DISTRIBUTION WITHIN A HIGH PRESSURIZED HYDROGEN CYLINDER DURING REFUELING

在储氢气瓶快充引起温升的理论基础上,考虑到真实气体充气的复杂性,基于真实气体的k-ε湍流模型,建立高压储氢气瓶快速充气温度变化的高精度数值计算模型。用计算流体力学软件Fluent13.0模拟35MPa,120L纤维缠绕铝内胆复合气瓶快速充气情况。为了研究气瓶的长径比和进气口直径对温升和温度分布的影响,分别对长径比为3.6、2.0,进气口直径为16mm、40mm、64mm的气瓶的充气情况进行模拟。数值模拟的结果表明在相同的充气条件下,长径比越小气瓶内最高充气温度越低,瓶内的温度分布也相对越均匀;进气口直径越小瓶内最高充气温度的升幅越小。

By taking the theoretical study of temperature rise within a hydrogen cylinder during a fast filling process and the complexity of a fast filling process with real hydrogen into consideration, a high-precision simulated model of a fast filling process had been build based upon the k-ε turbulence model of real gas. Computational fluid dynamics(CFD) software Fluent 13.0 was applied to simulate the refueling process within a filament wound composite hydrogen cylinder with aluminum liner. In order to study the effect of the length to diameter(L/D) radio and the inlet diameter of the cylinder on temperature rise and temperature distribution, numerical simulations were performed with different L/D radios such as 3.6 and 2.0. And to ascertain the effect of inlet diameter, cylinders with the inlet diameters of 16mm, 40mm, and 64mm were simulated as well. The results show that the larger ratio of L/D, the higher temperature rise within the cylinder. Similarly, the temperature rise within a larger inlet diameter cylinder is higher than that within a smaller inlet diameter cylinder.