Abstract

Hydrogen release from a high-pressure chamber is modeled in this thesis. Two approaches are developed to investigate the real gas effects at high pressures. In the first method, an analytical model is developed to simulate time histories of stagnation properties of hydrogen inside the chamber as well as sonic properties of hydrogen at the orifice. Thermodynamic relations describing the specific heats, internal energy, and speed of sound, are derived based on Beattie-Bridgeman state equation. In the second approach, a 3-D unstructured tetrahedral finite volume Euler solver is applied to numerically simulate the hydrogen release. The solver is modified to take into account the real gas effects. Modifications required to calculate the real gas Jacobian matrices and eigenvectors as well as to obtain the Roe's averaged convective fluxes are described. Real gas effect is also modeled by the same state equation. Numerical and analytical results are compared for ideal and real gas conditions. An excellent agreement is reported.