Numerical simulation of blunt body-generated detonation wave ramjet flowfields

Blunt body generated detonation wave ramjet flowfields have been studied numerically for a stoichiometrically premixed air-hydrogen gas mixture involving 13 species. Three different blunt body diameters are examined within a domain at fixed height and length, creating the channel blockage ratios of 16%, 25% and 33%.; For this an implicit numerical method based on the Lower-Upper Symmetric Gauss-Seidel scheme and a Roe flux difference splitting scheme was developed and thoroughly validated for laminar flows with non-equilibrium chemistry on structured multi-block grids.; Blunt body generated combustion is superior over wedge generated combustion for low in-flow temperatures, since ignition can be achieved within a domain of significantly smaller size.; With increasing channel blockage ratio the loans of total pressure and momentum increase, while the heat added slightly decreases. This makes the smallest channel blockage ratio the favourable.