Duct Aspect Ratio Effects on Shock Train Unsteadiness
Investigation on the effect of duct geometry on shock train dynamics
This investigation builds upon the study of shock train unsteadiness in a low aspect ratio duct. By parametrically varying the duct aspect ratio from 0.82 to 1.00 to 1.20, subtle changes in interaction structure are revealed. Shock train topology, similarity parameters, and scaling of the coherent mid-band shock train flapping modes are all considered, all of which present vital design information for hypersonic propulsion systems.
A set of three shock train interactions occurring in rectangular ducts of different aspect ratio. All other initial and boundary conditions are identical across the cases, with only geometric length scales changing from case to case.