Quantification of multiple types of uncertainties in the HyShot II scramjet

The talk describes a collaborative effort at quantifying the effects of different types of uncertainties on the pressure rise in the HyShot II scramjet combustor. These uncertainties include the shock-tube conditions (mean and turbulent state, angle-of-attack), the chemical reaction rates in the hydrogen-air chemistry, and errors in the assumed stress-strain relationship in the RANS turbulence model. A physics-based strategy for dimensional reduction is used to make the study computationally feasible. Results include the ranking of different types of uncertainties.