关键词: 双层高压储氢瓶；储氢能力；屈服强度；增容分析

Abstract: Inspired by the well-known fact that hydrostatic pressure usually has no influence on the yield strength of the material according to von mises yield criterion, the present paper simulates the pressuring processes maintaining the internal and external pressure difference for the common high-pressure bottles, and obtains the strength analysis conclusion that equal pressure difference always produces the same yield stress field. To maintain material strength and to improve internal pressure and storage capacity of the high-pressure hydrogen bottle, the double-layer high-pressure hydrogen storage bottle is conceptually designed according to this conclusion. The double-layer bottle has an additional inner bottle compared to the existing hydrogen storage bottle, forming two pressure layers inside the bottle, and thus adds an adjustable internal pressure difference. Maintaining a certain pressure difference, adjusting the relative size of the inner and outer layers, the hydrogen storage capacity per unit volume is analyzed under the same yield stress condition. It is found that the maximum storage capacity of the double-layer bottle can be increased by about 25% than the corresponding single-layer bottle. The present design and analysis results are a good reference to enhance the storage capacity of the hydrogen storage bottles.

Key words: Double layer high pressure hydrogen storage bottles; Hydrogen storage capacity; Yield strength; Capacity enhancement analysis