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Showing 1 to 5 of 5 for “"Shield material"”.
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Approximate heat-transfer and wall-temperature calculations for aeroassisted orbital transfer vehicles
… heat-transfer and surface temperatures on heat-shields of Aeroassisted Orbital Transfer Vehicles (AOTVs) in hypersonic flow regimes. Inviscid flowfield solutions are obtained about the aerobraking shield on the AOTVs using axisymmetric Euler's equations. The flowfield solutions are coupled with …
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Assessment of aerocapture-entry trajectories for human Mars exploration
… system efficiency, entry velocity, or heat shield material. Additionally, results show that aerocapture-entry architectures incur a TPS mass penalty up to 27% relative to direct entry, depending on vehicle. In addition, direct entry avoids needing propellant for in-space maneuvers between …
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Validation and verification of FLUKA for neutron shielding problems
… results. Concrete is the most generally used shield material as it is inexpensive and adjustable for any construction design. Radiation shielding properties of concrete may vary depending on the concrete composites. In this thesis, the fluences (i.e. the flux integrated over time) of neutrons …
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Batch-microfabricated miniaturized planar arrays of Langmuir probes for reentry plasma diagnostics and nanosatellites
… of the surrounding air and ablation of the heat shield material, which leads to the dissociation and ionization of the background atmosphere. The plasma sheath that surrounds the spacecraft affects the heat transfer to the spacecraft, its aerodynamics, and its capability to communicate. A …
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A Forward-Backward Fluence Model for the Low-Energy Neutron Boltzmann Equation
… forward and backward neutron fluence in selected materials. Linear B-splines were used to change the integro-differential equations into a coupled system of ordinary differential equations (O.D.E.'s). Difference approximations were then used to recast the O.D.E.'s into a coupled system of linear …