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 balance and an equilibrium ablation model for graphite. The effect of gas injection in the boundary layer is studied focusing the attention on the wall heat flux and its reduction due to convective blockage. Flat plate tests are presented. Results are compared with the most commonly used simplified approaches.
CFD Study of Isothermal Ablation / Bianchi, Daniele; E., Martelli; Nasuti, Francesco; Onofri, Marcello. - ELETTRONICO. - (2007), pp. 1-8. (Intervento presentato al convegno 2nd European Conference for Aerospace Sciences tenutosi a Bruxelles, Belgio nel 1-6 luglio 2007).
CFD Study of Isothermal Ablation
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 balance and an equilibrium ablation model for graphite. The effect of gas injection in the boundary layer is studied focusing the attention on the wall heat flux and its reduction due to convective blockage. 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.
