Aeroelastic Study of Detonation Waves Formed over the Ramp Structure of Oblique Detonation Wave Engine

Abstract

Oblique Detonation Wave Engines have gained a lot of research interest due to their higher total pressure recoveries and shorter combustor lengths. However, for a ramp-induced type detonation, extreme temperature and pressure loadings cause ramps to deflect, decrease the effective ramp angle and hence alter the detonation wave properties. This study aims to study the aeroelastic response of such compliant ramp structures and assess their vibrational properties. Moreover, considering two compliant ramps of horizontal length 100 mm and 150 mm, which when rigid, admit near-to-zero mass spillage from the combustor to the nozzle were studied by coupling an in-house OpenFOAM-based solver rhoCentralReactingFoam with an open-source FEM solver Calculix coupled with coupling library - preCICE. Their responses indicated that their forced response is first-mode dominated and the induction zone of oblique detonations move along the ramp with first-mode dominant response. Viscous simulation of the reactive flow-field along with inclusion of temperature-dependent material properties of the ramp structure is suggested to conduct fluid-thermal-structural-interaction studies.