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Thermochemical interactions in hypersonic boundary layer stability.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Thermochemical interactions in hypersonic boundary layer stability./
Author:	Johnson, Heath Bradley.
Description:	1 online resource (116 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 62-04, Section: B.
Contained By:	Dissertations Abstracts International62-04B.
Subject:	Aerospace materials. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9975757click for full text (PQDT)
ISBN:	9780599814288

Thermochemical interactions in hypersonic boundary layer stability.
Johnson, Heath Bradley.

Thermochemical interactions in hypersonic boundary layer stability. - 1 online resource (116 pages)

Source: Dissertations Abstracts International, Volume: 62-04, Section: B.

Thesis (Ph.D.)--University of Minnesota, 2000.

Includes bibliographical references

Hypersonic gas flow over cones is solved using computational fluid dynamics to obtain accurate boundary layer profiles. A linear stability analysis is performed on the profiles to determine the amplification rates of naturally occurring disturbances, and this information is used with the e N method to predict the boundary layer transition location. The effects of free-stream total enthalpy and chemical composition on transition location are studied to give a better understanding of recent experimental observations. Namely, there is an increase in transition Reynolds number with increasing free-stream total enthalpy, and this increase is greater for gases with lower dissociation energies. It was observed that as the free-stream enthalpy is increased, the presence of chemical reactions and translational-vibrational energy exchange in the boundary layer becomes increasingly important and a stability code which does not take these effects into account will not give correct disturbance amplification rates. However, when these energy transfer modes are properly accounted for, linear stability predicts the same trends that were observed in the experiments. The analysis demonstrates a significant damping effect of endothermic chemical reactions and thermal energy transfer in boundary layer disturbances. Conversely, exothermic reactions are shown to have a destabilizing effect. Therefore, a series of numerical experiments were performed in an attempt to further our understanding of the role of thermochemical interactions in hypersonic boundary layer stability.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9780599814288Subjects--Topical Terms:

3433227
Aerospace materials.
Subjects--Index Terms:

Boundary layerIndex Terms--Genre/Form:

542853
Electronic books.

Thermochemical interactions in hypersonic boundary layer stability.
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100 1 $a Johnson, Heath Bradley. $3 3696838
245 1 0 $a Thermochemical interactions in hypersonic boundary layer stability.
264 0 $c 2000
300 $a 1 online resource (116 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Dissertations Abstracts International, Volume: 62-04, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Candler, Graham V.
502 $a Thesis (Ph.D.)--University of Minnesota, 2000.
504 $a Includes bibliographical references
520 $a Hypersonic gas flow over cones is solved using computational fluid dynamics to obtain accurate boundary layer profiles. A linear stability analysis is performed on the profiles to determine the amplification rates of naturally occurring disturbances, and this information is used with the e N method to predict the boundary layer transition location. The effects of free-stream total enthalpy and chemical composition on transition location are studied to give a better understanding of recent experimental observations. Namely, there is an increase in transition Reynolds number with increasing free-stream total enthalpy, and this increase is greater for gases with lower dissociation energies. It was observed that as the free-stream enthalpy is increased, the presence of chemical reactions and translational-vibrational energy exchange in the boundary layer becomes increasingly important and a stability code which does not take these effects into account will not give correct disturbance amplification rates. However, when these energy transfer modes are properly accounted for, linear stability predicts the same trends that were observed in the experiments. The analysis demonstrates a significant damping effect of endothermic chemical reactions and thermal energy transfer in boundary layer disturbances. Conversely, exothermic reactions are shown to have a destabilizing effect. Therefore, a series of numerical experiments were performed in an attempt to further our understanding of the role of thermochemical interactions in hypersonic boundary layer stability.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Aerospace materials. $3 3433227
650 4 $a Aerospace engineering. $3 1002622
653 $a Boundary layer
653 $a Enthalpy
653 $a Hypersonic
653 $a Linear stability
653 $a Thermochemical interactions
653 $a Translational-vibrational energy
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0538
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a University of Minnesota. $3 676231
773 0 $t Dissertations Abstracts International $g 62-04B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9975757 $z click for full text (PQDT)