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An investigation into the mechanisms...

Kehs, Joshua Paul.

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An investigation into the mechanisms of drag reduction of a boat tailed base cavity on a blunt based body.

Record Type:	Electronic resources : Monograph/item
Title/Author:	An investigation into the mechanisms of drag reduction of a boat tailed base cavity on a blunt based body./
Author:	Kehs, Joshua Paul.
Description:	179 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
Contained By:	Dissertation Abstracts International75-05B(E).
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3610278
ISBN:	9781303699641

An investigation into the mechanisms of drag reduction of a boat tailed base cavity on a blunt based body.
Kehs, Joshua Paul.

An investigation into the mechanisms of drag reduction of a boat tailed base cavity on a blunt based body. - 179 p.

Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.

Thesis (Ph.D.)--Clarkson University, 2014.

It is well documented in the literature that boat-tailed base cavities reduce the drag on blunt based bodies. The majority of the previous work has been focused on the final result, namely reporting the resulting drag reduction or base pressure increase without examining the methods in which such a device changes the fluid flow to enact such end results. The current work investigates the underlying physical means in which these devices change the flow around the body so as to reduce the overall drag.

ISBN: 9781303699641Subjects--Topical Terms:

1018395
Engineering, Aerospace.

An investigation into the mechanisms of drag reduction of a boat tailed base cavity on a blunt based body.
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020 $a 9781303699641
035 $a (MiAaPQ)AAI3610278
035 $a AAI3610278
040 $a MiAaPQ $c MiAaPQ
100 1 $a Kehs, Joshua Paul. $3 3169105
245 1 3 $a An investigation into the mechanisms of drag reduction of a boat tailed base cavity on a blunt based body.
300 $a 179 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
500 $a Adviser: Kenneth Visser.
502 $a Thesis (Ph.D.)--Clarkson University, 2014.
520 $a It is well documented in the literature that boat-tailed base cavities reduce the drag on blunt based bodies. The majority of the previous work has been focused on the final result, namely reporting the resulting drag reduction or base pressure increase without examining the methods in which such a device changes the fluid flow to enact such end results. The current work investigates the underlying physical means in which these devices change the flow around the body so as to reduce the overall drag.
520 $a A canonical model with square cross section was developed for the purpose of studying the flow field around a blunt based body. The boat-tailed base cavity tested consisted of 4 panels of length equal to half the width of the body extending from the edges of the base at an angle towards the models center axis of 12°. Drag and surface pressure measurements were made at Reynolds numbers based on width from 2.3x105 to 3.6x10 5 in the Clarkson University high-speed wind tunnel over a range of pitch and yaw angles. Cross-stream hotwire wake surveys were used to identify wake width and turbulence intensities aft of the body at Reynolds numbers of 2.3x105 to 3.0x105. Particle Image Velocimetry (PIV) was used to quantify the flow field in the wake of the body, including the mean flow, vorticity, and turbulence measurements.
520 $a The results indicated that the boat-tailed aft cavity decreases the drag significantly due to increased pressure on the base. Hotwire measurements indicated a reduction in wake width as well as a reduction in turbulence in the wake. PIV measurements indicated a significant reduction in wake turbulence and revealed that there exists a co-flowing stream that exits the cavity parallel to the free stream, reducing the shear in the flow at the flow separation point. The reduction in shear at the separation point indicated the method by which the turbulence was reduced. The reduction in turbulence combined with the reduction in wake size provided the mechanism of drag reduction by limiting the rate of entrainment of fluid in the recirculating wake to the free stream and by limiting the area over which this entrainment occurs.
590 $a School code: 0049.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Automotive. $3 1018477
690 $a 0538
690 $a 0548
690 $a 0540
710 2 $a Clarkson University. $b Mechanical Engineering. $3 2093980
773 0 $t Dissertation Abstracts International $g 75-05B(E).
790 $a 0049
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3610278