Abstract
It is planned to launch Orion Crew Vehicle to International Space Station, Moon and Mars by NASA. The fire protection is the most important problem in the cabin of low pressure, high Oxygen mass fraction and low gravity conditions. The experimental test of flame spread over flammable material in low gravity requires huge cost and it is actually unacceptable. This study tested upward flame spread over PMMA in different conditions of pressure, Oxygen mass fraction and gravity by numerical simulations. The flame spread speed and peak heat release fell as gravity was dropped at same pressure and Oxygen mass fraction conditions.
