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Computer Program For One Dimensional Nonequilibrium Reacting Gas Flow

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Computer Program For One Dimensional Nonequilibrium Reacting Gas Flow

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Author : H. S. Dresser
language : en
Publisher:
Release Date : 1967

Computer Program For One Dimensional Nonequilibrium Reacting Gas Flow written by H. S. Dresser and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Aerothermodynamics categories.

A computer program has been developed for one-dimensional nonequilibrium reacting gas flow. The program is written in Fortran IV and is compatible with the IBM 7044/7094 direct coupled digital computer system at Wright-Patterson Air Force Base, Ohio. In addition to nonequilibrium chemistry, the program includes nonequilibrium vibrational and electronic energy relaxation and coupling effects between these energy modes and the chemistry. The formulation is based on a one-dimensional flow matching either a prescribed pressure or area variation along a streamtube. Thermodynamic properties are computed by assuming an ideal gas mixture and the equilibration of translational and rotational temperatures. The internal energy modes, rotation, vibration, and electronic excitation, are considered uncoupled; and a rigid rotator, cut off simple harmonic oscillator, independent of the electronic state, is assumed. Excitation of vibrational and electronic energies are treated similarly with terms which account for relaxation and chemical reactions. The effects of nonequilibrium vibrational and electronic states on chemical rates are included in the coupling analysis. The vibrational relaxation time constants were obtained from the Millikan and White data while the electronic relaxation time constants were determined for nitrogen from an analysis of existing shock tube radiation measurements. The computer program was used to solve for the nonequilibrium flow in a hypersonic nozzle and for eight streamlines in the inviscid flow field over a spherically blunted nine-degree semiapex angle cone at zero angle of attack. (Author).

Nasa Technical Report

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Author :
language : en
Publisher:
Release Date : 1969

Nasa Technical Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Aerodynamics categories.

Technical Abstract Bulletin

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Author :
language : en
Publisher:
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Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Science categories.

A Compilation Of Computer Programs In Flight Vehicle Technology

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Author : Ambrose B. Nutt
language : en
Publisher:
Release Date : 1968

A Compilation Of Computer Programs In Flight Vehicle Technology written by Ambrose B. Nutt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Aeronautics categories.

A compilation of computer programs useful in the design of flight vehicles. Technical domains covered include the following: Structures; Aerodynamics; Vehicle dynamics; Flight control; Environmental control; Crew escape and retardation; and Landing gear subsystems. All programs were devised in-house in the Air Force Flight Dynamics Laboratory or were prepared for them under R and D contracts. (Author).

A Simplified Molecular Model For Studying Vibration Dissociation Coupling In Fluid Flows

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Author : Walter Albert Reinhardt
language : en
Publisher:
Release Date : 1969

A Simplified Molecular Model For Studying Vibration Dissociation Coupling In Fluid Flows written by Walter Albert Reinhardt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Dissociation categories.

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.

Computer Program For The Numerical Solution Of Nonequilibrium Expansions Of Reacting Gas Mixtures

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Author : J. A. Lordi
language : en
Publisher:
Release Date : 1966

Computer Program For The Numerical Solution Of Nonequilibrium Expansions Of Reacting Gas Mixtures written by J. A. Lordi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Gas dynamics categories.