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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781792972621
Category :
Languages : en
Pages : 28
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Book Description
The final report on research between North Carolina State University and the NASA Ames Research Center is presented. The research was aimed at using the Schwartz, Slawsky, Herzfeld (SSH) theory to simulate the vibrational relaxation of nitrogen molecules undergoing dissociation or recombination over a wide range of conditions. The results of these simulations were then treated as exact, and they were used to develop a model for the coupled vibration-dissociation process. This new model is simple enough to be used in computational fluid dynamics codes, but still captures the physics of the complex process. The model is used to simulate the flow over typical geometries to test it and to determine how much impact it has on the flow field. The key elements of this research are summarized. Candler, Graham V. NASA-CR-191775, NAS 1.26:191775 NCA2-519...
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781792972621
Category :
Languages : en
Pages : 28
Get Book Here
Book Description
The final report on research between North Carolina State University and the NASA Ames Research Center is presented. The research was aimed at using the Schwartz, Slawsky, Herzfeld (SSH) theory to simulate the vibrational relaxation of nitrogen molecules undergoing dissociation or recombination over a wide range of conditions. The results of these simulations were then treated as exact, and they were used to develop a model for the coupled vibration-dissociation process. This new model is simple enough to be used in computational fluid dynamics codes, but still captures the physics of the complex process. The model is used to simulate the flow over typical geometries to test it and to determine how much impact it has on the flow field. The key elements of this research are summarized. Candler, Graham V. NASA-CR-191775, NAS 1.26:191775 NCA2-519...
Author: D. Brian Landrum
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Fred R. DeJarnette
Publisher:
ISBN:
Category : Nonequilibrium thermodynamics
Languages : en
Pages : 36
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Author: Graham Candler
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Eswar Josyula
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Fred R. DeJarnette
Publisher:
ISBN:
Category : Nonequilibrium thermodynamics
Languages : en
Pages : 29
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Author: Walter Albert Reinhardt
Publisher:
ISBN:
Category : Dissociation
Languages : en
Pages : 338
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Book Description
A simplified mathematical model is derived that is useful for studying the effects of vibration-dissociation coupling in fluid flows. The derivation is based on energy-moment procedure for simplifying the master equations. To obtain the model equations it is assumed that the vibrational energy can be approximated by the introduction of two vibrational temperatures. The effects of molecular anharmonicity are also accounted for in an approximate manner. The parameters contained within the equations are evaluated by making comparisons with experimental data. It is shown that the model contains the minimum required structure allowing favorable agreement with existing experimental data. Numerical solutions are given for the quasi-steady zone behind a normal shock wave, for the complete structure of a shock wave, and for nozzle flow. The results provide the appropriate pre-exponential temperature dependence of the effective dissociation rate, yield and induction time before dissociation is observed, and, in the case of expanding flow, yield one-fourth less effective relaxation time than the Landau-Teller theory. The thermodynamic quantities for the vibrational mode (partition function, internal energy, and specific heat) agree accurately with like quantities evaluated from spectroscopic data. By the introduction of appropriate assumptions it is shown that the equations reduce to a form identical to the Marrone-Treanor model except for a "truncation factor". When the vibrational temperatures are not large, the model is identical to that of Landau and Teller. The numerical procedure used to integrate the system of rate and flow equations is also described.
Author: Fred R. DeJarnette
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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Author: Fred R. DeJarnette
Publisher:
ISBN:
Category : Coupling constants
Languages : en
Pages : 34
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Author: David E. McGough
Publisher:
ISBN:
Category :
Languages : en
Pages :
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