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.
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Showing 1 to 11 of 11 for “"Aerothermodynamics"”.
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Aerothermodynamics and operation of turbine system under unsteady pulsating flow
An assessment of a turbine system operating under highly pulsating flow environment typically found in vehicular turbochargers is made to: identify the key operating parameters, enable the formulation of a reduced order model, delineate the sources of loss and suggest strategies for performance …
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Model Reduction of Computational Aerothermodynamics for Multi-Discipline Analysis in High Speed Flows
This dissertation describes model reduction techniques for the computation of aerodynamic heat flux and pressure loads for multi-disciplinary analysis of hypersonic vehicles.NASA and the Department of Defense have expressed renewed interest in the development of responsive, reusable hypersonic …
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Maximum entropy quadratic model to characterize chemical non-equilibrium in re-entry flows
… reactions, which are important processes in aerothermodynamics, are studied. The kinetic and thermodynamic data is obtained from ab-initio calculations performed at NASA Ames Research Center. Previous analysis of the population distribution revealed that the population of the low lying energy …
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A new parabolized Navier-Stokes scheme for hypersonic reentry flows
… are an important problem area in computational aerothermodynamics. Available numerical tools for handling such flows are very few and significantly limited in their applicability. A new implicit fully-iterative Parabolized Navier-Stokes (PNS) scheme is developed to accurately predict such …
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Design and Performance of a Communications System for a Low-Cost High Altitude Balloon Platform for Troposphere and Stratosphere Research
… operational issues concerning hypersonic vehicle aerothermodynamics, boundary layer stability, and aero-optical propagation. In situ turbulence measurements along with modeling will quantify spatiotemporal statistics and the dependence of stratospheric turbulence on underlying meteorology to a …
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The Patch Integral Method (PIM), a New Heat Transfer Analysis Tool for Hypersonic Wind Tunnel Facilities at NASA Langley
The NASA Langley Research Center hypersonic wind tunnels serve a vital role in the field of hypersonics in both helping validate CFD predictions and producing experimental results. These tunnels have been heavily utilized for decades by numerous planetary missions, such as MSL and Orion, commercial …
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Development of a high-fidelity thermochemical model for the O2+O system using direct simulation Monte Carlo
The presented work is about the investigation of reactions in a thermo-chemical non-equilibrium condition, which is especially with the application with the flows encountered during atmosphere entry/re-entry missions. The particle-based computational method, direct simulation Monte Carlo(DSMC), has …
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Nonequilibrium Shock-Layer Radiative Heating for Earth and Titan Entry
This thesis examines the modeling of the shock-layer radiative heating associated with hypersonic vehicles entering the atmospheres of Earth and Titan. For Earth entry, flight conditions characteristic of lunar-return are considered, while for Titan entry, the Huygens probe trajectory is …
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Continuum breakdown assessment and state-based transport modeling for non-equilibrium hypersonic flows
The work presented in this dissertation is motivated by the need for improving the fidelity of physical and chemical models used for predicting flowfield properties during hypersonic (re)entry of space vehicles into planetary atmospheres. Commonly employed numerical approaches for simulating the …
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Uncertainty quantification of vista charring ablator material database using Bayesian inference
During hypersonic trajectory through a planetary atmosphere a high heat flux environment is generated due to the friction between gas particles and the vehicle. To protect it from the excessive heat energy that is transferred to it, Thermal Protection Systems are implemented in the spacecraft’s …