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AEROFAST : THERMAL/ABLATION ANALYSIS OF THE FRONT HEAT SHIELD FOR A MARTIAN AEROCAPTURE MISSION

Cork based TPS. Silicon based glue. CFRP. Aluminum honeycomb. CFRP. S/D=0.482. S/D=0.561. AEROFAST : THERMAL/ABLATION ANALYSIS OF THE FRONT HEAT SHIELD FOR A MARTIAN AEROCAPTURE MISSION A.J. van Eekelen, G. Pinaud, J.-M. Bouilly. Problem description.

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AEROFAST : THERMAL/ABLATION ANALYSIS OF THE FRONT HEAT SHIELD FOR A MARTIAN AEROCAPTURE MISSION

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  1. Cork based TPS Silicon based glue CFRP Aluminum honeycomb CFRP S/D=0.482 S/D=0.561 AEROFAST: THERMAL/ABLATION ANALYSIS OF THE FRONT HEAT SHIELD FOR A MARTIAN AEROCAPTURE MISSION A.J. van Eekelen, G. Pinaud, J.-M. Bouilly Problem description In the frame of the AEROFAST (AEROcapture for Future space tranSporTation) R&D project (FP7), we aim to increase the TRL level of a Martian Aerocapture mission. The Aerocapture trajectory and maneuver results in significant aerodynamic heating, necessitating a Thermal Protection System (TPS). The selected shield has an Apollo like shape with a 3.6 m diameter. The thermal and ablation behavior of a low density (phenolic impregnated) cork TPS is analyzed. The heat shield is subjected to a 3D convection and radiation load obtained for a CO2 Martian atmosphere. Modelling approach Loads and boundary conditions Thermal response calculation Finite element model 3D transient temperature dependent (convection) heat flux, evaluated using an Euler-boundary layer computation and empirical correlation adapted to CO2 gas. Heat flux at t = 160. s [kw/m2] Energy balance: Mass conservation: Arrhenius-type charring law: Boundary balance: Explicit ablation law: The elements have multiple degrees of freedom per node (T,P,,1,…,n), and the balance equations are implemented on a moving mesh (transport terms). The 3D half model consists of 58.894 elements with a total of 144.031 degrees of freedom. Through the thickness and 3D finite element distribution Results 1D calculation 3D calculation Parametric analysis to determine the TPS thickness (17 mm),for a maximum allowable structure temperature of 180 °C. Edge cross-section for  = 180° Conclusions A 3D finite element model, including charring and ablation, has been implemented in SAMCEF. A preliminary TPS design of a phenolic impregnated cork material has been obtained, while complementary work on advanced (cork based) TPS material modeling is underway within the AEROFAST project.

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