Numerical Investigation of Hydrogen Release from High Pressure Reservoir

Hydrogen is a renewable and clean source of energy, and it is a good replacement for the current fossil fuels. Nevertheless, hydrogen should be stored in high pressure reservoirs to have sufficient energy. This increases the risk of failure of the tank valve which can lead to the release of high-pressure hydrogen and explosion. Therefore, safety is a key issue in our future hydrogen energy society which must be carefully investigated. Hydrogen release from a high-pressure tank is to be modeled in thesis. Two approaches are developed to investigate the releasing conditions. In the first method, a numerical model is developed to simulate time histories of stagnation properties of hydrogen inside the tank. As well as sonic properties of hydrogen at the orifice. Corresponding thermodynamic relations, which describe the specific heats, internal energy and speed of sound are derived based on the ideal gas and real state equations. Regarding the second approach a 2-D computational model constructed using the design modeler of ANSYS Fluent 2023 R1 workbench, based on species transfer model and realizable k-ε turbulence model is applied to numerically simulate the unignited hydrogen underexpanded jet release.