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Influence of Aerothermoelasticity on Performance of Oblique Detonation Wave Engines
Pandey, Anup
Pandey, Anup
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Abstract
Oblique Detonation Wave Engines (ODWEs) possess high prospects as an airbreathing propulsive system for high-speed vehicles due to shorter combustor length, high specific impulse, and high specific heat release. However, thin compliant panels used in compression ramp, over which oblique detonation waves are stabilized, are susceptible to aerothermoelastic oscillation. This study investigates aerothermoelastic response of the compression ramp and its effect on total pressure recovery and combustion efficiency of the ODWEs using coupled fluid-structure interaction (FSI) simulations at two distinct temperatures (298 K and 500 K) and a coupled fluid-thermal-structure interaction (FTSI) simulation. Using preCICE coupling library, a partitioned approach to multiphysics simulations is used to couple in-house OpenFOAM-based compressible reacting flow solver: rhoCentralReactingFoam with thermo-structural solver: CalculiX. The ramp oscillated around a constant mean position in FSI simulations while the mean position continuously shifted downwards in the FTSI simulation due to thermomechanical deformation and thermal degradation of the ramp material caused by transient diffusive heat transfer. In all FSI and FTSI simulations, total pressure recovery and combustion efficiency showed a strong positive and negative correlation respectively with the ramp’s displacement. A maximum of 39.5% increase in total pressure recovery and a 9.5% decrease in combustion efficiency was observed due to aerothermoelastic deformation of the ramp. Heat flux at the reattachment region increased due to an increase in wall temperature while heat flux decreased towards the ramp’s tip due to the effect of the ramp’s downward displacement. This highlights the need for an effective thermal protection system, especially in the reattachment region. A study on damping characteristics showed that an increase in wall temperature from 298K to 500K in FSI simulations reduced the damping ratio of the oscillations by about 2 times while it reduced by a factor of about 2.5 after simulation time of 20 ms in FTSI simulation. FTSI simulation for extended physical time is suggested to fully characterize flutter tendencies as the temperature increases.
Description
This is the paper from a presentation given at AIAA SciTech Forum 2025 on 01/08/2025.
Date
2025-01-08
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University of Kansas
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Keywords
Aerothermoelsasticity, Oblique Detonation Wave, FSI, FTSI, Shock Wave Boundary Layer Interraction