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A Simplified Method for Calculating Spectral Emission of Nonequilibrium Air Plasmas in Hypersonic Shock-Layers
Tao Jiang
Computational Aerodynamics Institute of CARDC
Corresponding Author
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A simplified method for calculating the spectral emission of nonequilibrium air plasmas is developed. In order to obtain the nonequilibrium energy level populations, the nonequilibrium coefficients are introduced into the Saha-Boltzmann equation. These nonequilibrium coefficients are calculated by using several significant radiative processes. An approach to the determination of nonequilibrium electronic energy level populations of diatomic molecules is also presented. Based on the method, spectral emission of atoms and molecules in a typical air plasma cell is investigated. The results reveal that there is a significant difference between the nonequilibrium and equilibrium emission. We apply the method to the nonequilibrium AVCO R-156 experiment. Good agreement with the measured data is shown, indicating that the method is reasonable and has good accuracy.
Keywords
Spectral emission, Nonequilibrium, Air plasma, Hypersonic
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CURRENT STATUS: Under Review
Version 1
Posted 14 Dec, 2020
No community comments so far
Editorial decision: Major revision
On 02 Feb, 2021
Review #2 received
Received 28 Jan, 2021
Reviewer #3 agreed
On 28 Jan, 2021
Review #3 received
Received 28 Jan, 2021
Review #1 received
Received 18 Jan, 2021
Reviewer #2 agreed
On 16 Jan, 2021
Reviewer #1 agreed
On 12 Jan, 2021
Reviewers invited
Invitations sent on 08 Dec, 2020
Editor assigned
On 07 Dec, 2020
Submission checks complete
On 07 Dec, 2020
Editor invited
On 07 Dec, 2020
First submitted
On 01 Dec, 2020
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Subject Areas
Aeronautics and Astronautics
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This preprint is under consideration at Advances in Aerodynamics. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research
A Simplified Method for Calculating Spectral Emission of Nonequilibrium Air Plasmas in Hypersonic Shock-Layers
Tao Jiang
Computational Aerodynamics Institute of CARDC
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 14 Dec, 2020
No community comments so far
Editorial decision: Major revision
On 02 Feb, 2021
Review #2 received
Received 28 Jan, 2021
Reviewer #3 agreed
On 28 Jan, 2021
Review #3 received
Received 28 Jan, 2021
Review #1 received
Received 18 Jan, 2021
Reviewer #2 agreed
On 16 Jan, 2021
Reviewer #1 agreed
On 12 Jan, 2021
Reviewers invited
Invitations sent on 08 Dec, 2020
Editor assigned
On 07 Dec, 2020
Submission checks complete
On 07 Dec, 2020
Editor invited
On 07 Dec, 2020
First submitted
On 01 Dec, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Aeronautics and Astronautics
License:
This work is licensed under a CC BY 4.0 License. Read Full License
A simplified method for calculating the spectral emission of nonequilibrium air plasmas is developed. In order to obtain the nonequilibrium energy level populations, the nonequilibrium coefficients are introduced into the Saha-Boltzmann equation. These nonequilibrium coefficients are calculated by using several significant radiative processes. An approach to the determination of nonequilibrium electronic energy level populations of diatomic molecules is also presented. Based on the method, spectral emission of atoms and molecules in a typical air plasma cell is investigated. The results reveal that there is a significant difference between the nonequilibrium and equilibrium emission. We apply the method to the nonequilibrium AVCO R-156 experiment. Good agreement with the measured data is shown, indicating that the method is reasonable and has good accuracy.
Figure 1
Figure 2
Figure 3
Due to technical limitations, full-text HTML conversion of this manuscript could not be completed. However, the manuscript can be downloaded and accessed as a PDF.