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Effects of Surface Roughness on Shoc...

Hoffman, Eugene Nii Akwei.

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Effects of Surface Roughness on Shock-Wave/Boundary-Layer Interactions at Mach 7.2.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of Surface Roughness on Shock-Wave/Boundary-Layer Interactions at Mach 7.2./
Author:	Hoffman, Eugene Nii Akwei.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	329 p.
Notes:	Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
Contained By:	Dissertations Abstracts International84-11B.
Subject:	Mechanical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30423475
ISBN:	9798379579661

Effects of Surface Roughness on Shock-Wave/Boundary-Layer Interactions at Mach 7.2.
Hoffman, Eugene Nii Akwei.

Effects of Surface Roughness on Shock-Wave/Boundary-Layer Interactions at Mach 7.2. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 329 p.

Source: Dissertations Abstracts International, Volume: 84-11, Section: B.

Thesis (Ph.D.)--The University of Texas at San Antonio, 2023.

This item must not be sold to any third party vendors.

This research work studies the effects of surface roughness on shock-wave/boundary-layer interactions (SWBLIs). SWBLI are prevalent in supersonic and hypersonic flows and occur when a shockwave generated from geometrical changes on a high-speed vehicle impinges on the vehicle's boundary layer. This complex phenomenon can be catastrophic and warrants the need for investigation to gain a full understanding of its dynamics.{A0}{A0}This study was performed in the newly completed UTSA Mach 7 Ludwieg tube wind tunnel facility which can operate at stagnation pressures up to 13.8 MPa and temperatures up to 700 K creating Mach 7.2 flows with Reynold numbers of up to 200 x 106 m-1. The facility boasts a highly optically accessible test section with a 203 mm x 203 mm cross-section with a 152 mm x 152 mm useable core.{A0}{A0}A flat plate with a 33{phono}{mllhring} compression ramp was used to generate the interaction during experimentation. A carbon fiber composite material was employed to create the desired surface roughness condition which juxtaposed the smooth surface baseline condition reflective of the vast majority of the current literature base. Diagnostic techniques applied to study this phenomenon included high-speed schlieren imaging, pressure- and temperature-sensitive paint, acetone molecular tagging velocimetry, and high-speed surface pressure probes.{A0}Results showed the roughness, characterized to be in the hydraulically smooth regime, decreased the interaction size based on a boundary layer normalized length scale, decreased the broadband low-frequency content present, and increased pressures, temperatures, and heat flux transmission to the compression ramp.{A0}{A0}

ISBN: 9798379579661Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Hypersonic

Effects of Surface Roughness on Shock-Wave/Boundary-Layer Interactions at Mach 7.2.
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260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 329 p.
500 $a Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
500 $a Advisor: Combs, Christopher S.
502 $a Thesis (Ph.D.)--The University of Texas at San Antonio, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a This research work studies the effects of surface roughness on shock-wave/boundary-layer interactions (SWBLIs). SWBLI are prevalent in supersonic and hypersonic flows and occur when a shockwave generated from geometrical changes on a high-speed vehicle impinges on the vehicle's boundary layer. This complex phenomenon can be catastrophic and warrants the need for investigation to gain a full understanding of its dynamics.{A0}{A0}This study was performed in the newly completed UTSA Mach 7 Ludwieg tube wind tunnel facility which can operate at stagnation pressures up to 13.8 MPa and temperatures up to 700 K creating Mach 7.2 flows with Reynold numbers of up to 200 x 106 m-1. The facility boasts a highly optically accessible test section with a 203 mm x 203 mm cross-section with a 152 mm x 152 mm useable core.{A0}{A0}A flat plate with a 33{phono}{mllhring} compression ramp was used to generate the interaction during experimentation. A carbon fiber composite material was employed to create the desired surface roughness condition which juxtaposed the smooth surface baseline condition reflective of the vast majority of the current literature base. Diagnostic techniques applied to study this phenomenon included high-speed schlieren imaging, pressure- and temperature-sensitive paint, acetone molecular tagging velocimetry, and high-speed surface pressure probes.{A0}Results showed the roughness, characterized to be in the hydraulically smooth regime, decreased the interaction size based on a boundary layer normalized length scale, decreased the broadband low-frequency content present, and increased pressures, temperatures, and heat flux transmission to the compression ramp.{A0}{A0}
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653 $a Surface roughness
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710 2 $a The University of Texas at San Antonio. $b Mechanical Engineering. $3 2103934
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