CFD codes typically treat fluid/solid boundary conditions in a simplified manner such as constant prescribed temperature or heat flux with zero mass transfer. However, thermal protection materials (TPS) strongly interact with the flow so that simple CFD surface boundary conditions cannot realistically be used for TPS design. In order to obtain a better estimation of the wall heat flux over an ablating surface, a two-dimensional axisymmetric full Navier-Stokes equation solver is used coupled with surface mass and energy balance and an equilibrium ablation model for graphite. Flat plate tests are presented. Results are compared with the most commonly used simplified approaches.
A Numerical Approach for High-Temperature Flows over Ablating Surfaces / Bianchi, Daniele; Nasuti, Francesco; E., Martelli; Onofri, Marcello. - ELETTRONICO. - (2007), pp. 1-11. (Intervento presentato al convegno 39th AIAA Thermophysics Conference tenutosi a Miami, FL, USA nel 25-28 giugno 2007).
A Numerical Approach for High-Temperature Flows over Ablating Surfaces
BIANCHI, DANIELE;NASUTI, Francesco;ONOFRI, Marcello
2007
Abstract
CFD codes typically treat fluid/solid boundary conditions in a simplified manner such as constant prescribed temperature or heat flux with zero mass transfer. However, thermal protection materials (TPS) strongly interact with the flow so that simple CFD surface boundary conditions cannot realistically be used for TPS design. In order to obtain a better estimation of the wall heat flux over an ablating surface, a two-dimensional axisymmetric full Navier-Stokes equation solver is used coupled with surface mass and energy balance and an equilibrium ablation model for graphite. Flat plate tests are presented. Results are compared with the most commonly used simplified approaches.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
