Analysis of a Cylindrical Specimen Heated by an Impinging Hot Hydrogen Jet

Wang, Ten-See; Luong, Van; Foote, John; Litchford, Ron J.; Chen, Yen-Sen

doi:10.2514/6.2006-2926

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…For steady-state simulations, an acceleration factor can be used to improve convergence of heat conduction in the solid. Implementation of the implicit treatment has been validated [22] by comparing computed results with those of the standard heat transfer SINDA code [23].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Single Flow Element in a Nuclear Thermal Thrust Chamber

Gc¹,

Ito²,

Yen-Sen³

et al. 2015

J Aeronaut Aerospace Eng

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The objective of this study was to develop an efficient and accurate computational methodology to predict detailed thermo-fluid environments of a single flow element in a hypothetical solid-core nuclear thermal thrust chamber assembly. Several numerical and multi-physics thermo-fluid models, such as chemical reactions, turbulence, conjugate heat transfer, porosity, and power generation, were incorporated into an unstructured-grid, pressure-based computational fluid dynamics solver used in this investigation. A secondary objective was to develop a porosity model for simulation of the whole solid-core nuclear thermal engine without resolving thousands of flow channels inside the solid core. Detailed numerical simulations of a single flow element with different power generation profiles were conducted to investigate the root cause of a phenomenon called mid-section corrosion that severely damaged the flow element assembly of early solid-core reactors. Under the assumptions employed in this effort and for the first time, the result demonstrated flow choking in the flow element. The possibility of flow choking in part of the flow element indicated a potential coolant mass flow imbalance, which could lead to a high local thermal gradient in coolant-starved flow elements and possibly the eventual mid-section corrosion.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Single Flow Element in a Nuclear Thermal Thrust Chamber

Gc¹,

Ito²,

Yen-Sen³

et al. 2015

J Aeronaut Aerospace Eng

View full text Add to dashboard Cite

show abstract

Multiphysics Analysis of a Solid-Core Nuclear Thermal Engine Thrust Chamber

Wang

Canabal

Cheng

et al. 2006

9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference

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The objective of this effort is to develop a n efficient and accurate thermo-fluid computational methodology to predict environments for a hypothetical solid-core, nuclear thermal engine thrust chamber. The computational methodology is based on an unstructured-grid, pressure-based computational fluid dynamics methodology. Formulations for heat transfer in solids and porous media were implemented and anchored. A two-pronged approach was employed in this effort: A detailed thermo-fluid analysis on a multi-channel flow element for mid-sectisn corrosion investigation; and a global modeling of the thrust chamber to understand the effect of hydrogen dissociation and recombination on heat transfer and thrust performance. The formulations and preliminary results on both aspects are presented. Nomenclature C I , C~, C~, C~turbulence modeling constants, 1.15, 1.9,0.25, and 0.09.

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Multiphysics Computational Analysis of a Solid-Core Nuclear Thermal Engine Thrust Chamber

Wang

Canabal

Cheng

et al. 2007

39th AIAA Thermophysics Conference

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The objective of this effort is to develop an efficient and accurate computational heat transfer methodology to predict thermal, fluid, and hydrogen environments for a hypothetical solid-core, nuclear thermal engine -the Small Engine, In addition, the effects of power profile and hydrogen conversion on heat transfer efficiency and thrust performance were also investigated. The computational methodology is based on an unstructured-grid, pressure-based, all speeds, chemically reacting, computational fluid dynamics platform, while formulations of conjugate heat transfer were implemented to describe the heat transfer from solid to hydrogen inside the solid-core reactor. The computational domain covers the entire thrust chamber so that the afore-mentioned heat transfer effects impact the thrust performance directly. The result shows that the computed core-exit gas temperature, specific impulse, and core pressure drop agree well with those of design data for the Small Engine. Finite-rate chemistry is very importaot io predictiog the proper energy balance as naturally occurring hydrogen decomposition is endothermic. Locally strong hydrogen conversion associated with centralized power profile gives poor heat transfer efficiency and lower thrust performance. On the other hand, uoiform hydrogen conversion associated with a more uoiform radial power profile achieves higher heat transfer efficiency, and higher thrust performance.

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Analysis of a Cylindrical Specimen Heated by an Impinging Hot Hydrogen Jet

Cited by 3 publications

References 5 publications

Numerical Study of Single Flow Element in a Nuclear Thermal Thrust Chamber

Numerical Study of Single Flow Element in a Nuclear Thermal Thrust Chamber

Multiphysics Analysis of a Solid-Core Nuclear Thermal Engine Thrust Chamber

Multiphysics Computational Analysis of a Solid-Core Nuclear Thermal Engine Thrust Chamber

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