Abstract
Highly non-uniform thermal transients experienced by the containing walls of a Rotating Detonation Combustor (RDC) are investigated in this paper. Unsteady RDC wall heat transfer is investigated by numerical and analytical work to explain the trends and explore the thermal effects of detonation wave propagation over a finite thickness metal wall. Three-dimensional Computational Fluid Dynamics (CFD) simulations are carried out to provide the thermal boundary conditions for the combustor wall. The analytical work is aimed towards development of a simple one-dimensional transient conduction model incorporating unsteady thermal boundary conditions. The numerical model is a 2-D Thermal-Mechanical transient heat conduction model with appropriate convective boundary condition on the interior wall of the combustor. The unsteady heat flux to the walls is mathematically formulated as function of temperature and time to closely resemble the heat flux profiles obtained from CFD simulations and manually repeated to constitute a periodic profile. Both analytical and numerical model predictions have been compared with published experimental data. The ultimate objective of the present study is to develop a simple and reasonable accurate model for faster prediction of metal temperatures and surface heat flux for long duration operation exposed to periodic high frequency harsh detonation environment.
Published Version
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