Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"Atmospheric reentry"”.
-
Modeling and Simulation of Radiation from Electronic Transitions in Hypersonic Atmospheric Reentry Flow
<p>A capability for higher accuracy heat transfer modeling in CFD for hypersonic re-entry flows, via inclusion of thermal radiation, is sought. With temperatures reaching tens of thousands of degrees, radiation is known to be significant to chemical reaction rates and thermal boundary layer …
-
Micro-to-meso scale high temperature response of ablative systems for atmospheric reentry
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
-
Spacecraft design-for-demise strategy, analysis and impact on low earth orbit space missions
Uncontrolled reentry into the Earth atmosphere by LEO space missions whilst complying with stipulated NASA Earth atmospheric reentry requirements is a vital endeavor for the space community to pursue. An uncontrolled reentry mission that completely ablates does not require a provision for …
-
A new guidance method for a DeltaV and re-entry constrained orbit transfer problem
… of any additional stages must lead rapidly to atmospheric reentry, typically within one revolution. Constrained to a fixed [delta]V resulting from a two stage thrust profile, the spacecraft must execute a burn maneuver that can effectively dissipate energy to place it on a transfer orbit with …
-
Modeling reactive rarefied systems using a novel quasi-particle Boltzmann solver
… can adequately model the rarefied portion of an atmospheric reentry trajectory. Direct Simulation Monte Carlo (DSMC) is the conventional solver for such conditions, but struggles to resolve transient flows, trace species, and high level internal energy states due to stochastic noise. …
-
Optimal trajectory design under uncertainty
Reference trajectory design for atmospheric reentry vehicles can be accomplished through trajectory optimization using optimal control techniques. However, this method generally focuses on nominal vehicle performance and does not include robustness considerations during trajectory design. This …
-
Design Options to Address Submersion Criticality for Low-Enriched Uranium Nuclear Thermal Propulsion Rocket
… occurring in the event a launch failure or an atmospheric reentry results in the reactor entering a body of water. In this accident, the flooding of the hydrogen coolant channels causes a surge in reactivity, which can be harmful to the environment around the reactor. This work focuses on …
-
On the Atmospheric Saliency of Space Debris Reentries: Estimating Distribution, Lifetime and Radiative Forcing of Reentry-Ablated Alumina
… space objects are often removed from LEO via atmospheric reentry. During reentry, unshielded satellites and rocket bodies experience extreme heating loads and material ablation, depositing small metallic particles in atmosphere. These particles can remain suspended in the atmosphere and …
-
Redefining “Space Sustainability” for Launch Vehicles: Forecasting the Atmospheric Impact of the Commercial Space Launch Industry in 2050
… on orbital debris, the burnup of vehicles during atmospheric reentry, and the resulting emissions. However, few studies have examined emissions from the launches themselves. Along with reentry burnup, rocket launches are the only source of high altitude anthropogenic emissions. At such high …
-
Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles
… Vehicle (MPCV) thermal protection system during atmospheric reentry from the International Space Station have been studied by direct numerical simulation, with the ultimate goal of reducing aerothermodynamic heating prediction uncertainty. Simulations were performed using a new, well-verified, …
-
Batch-microfabricated miniaturized planar arrays of Langmuir probes for reentry plasma diagnostics and nanosatellites
… under the extreme conditions encountered during reentry to the Earth's atmosphere. When a hypersonic vehicle travels through the atmosphere, a high-density and low-temperature plasma sheath forms around it due to shock heating of the surrounding air and ablation of the heat shield material, which …
-
Robust Spacecraft Autonomy for Deep Space Exploration in Special Euclidean Group SE(3)
… as spacecraft in some LEOs remain subject to atmospheric drag thus emphasizing their continued connection to Earth's immediate environment. Reflecting on this, it becomes clear that humanity has largely remained bound to Earth’s immediate vicinity since the Apollo missions reached the Moon. …
-
Sensitivity Analysis and Uncertainty Quantification of Plasma Jet Instabilities in the VKI Plasmatron
The VKI’s Plasmatron facility can reproduce the high-enthalpy gas flow encountered during the entry of a spacecraft into a planetary atmosphere and thus allows to test thermal protection materials used for the heat shield of the vehicle. However, the jet generated by the facility undergoes …