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Experimental study of growth rate en...

Shau, Yiowha Richard.

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Experimental study of growth rate enhancement and structure of compressible turbulent free shear layers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Experimental study of growth rate enhancement and structure of compressible turbulent free shear layers./
作者:	Shau, Yiowha Richard.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1990,
面頁冊數:	307 p.
附註:	Source: Dissertations Abstracts International, Volume: 52-12, Section: B.
Contained By:	Dissertations Abstracts International52-12B.
標題:	Aerospace materials. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9105659

Experimental study of growth rate enhancement and structure of compressible turbulent free shear layers.
Shau, Yiowha Richard.

Experimental study of growth rate enhancement and structure of compressible turbulent free shear layers. - Ann Arbor : ProQuest Dissertations & Theses, 1990 - 307 p.

Source: Dissertations Abstracts International, Volume: 52-12, Section: B.

Thesis (Ph.D.)--The University of Texas at Austin, 1990.

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

An experimental investigation has been made in a Mach 5 blowdown tunnel of the effects of initial conditions on the growth rate of a high Reynolds number, compressible, turbulent shear layer which is bounded by Mach 5 and Mach 3 air streams. Mean pitot pressure profiles were used to determine the growth rate of the shear layers. Also, experiments have been conducted to determine if two-point fluctuating pitot pressure measurements can be used to detect and quantify the large-scale structure in the supersonic shear layer. Further, the effects of the initial conditions on the dynamics of the large-scale structures were investigated. (1) Two-dimensional or three-dimensional shocks incident on the shear layer have relatively little effect on the shear layer evolution. (2) The changes in the initial conditions caused by either planar shock waves or "corrugated" shock impingement on the turbulent boundary layer result in a large local increase in growth rate immediately downstream of the shear layer origin. (3) Although the RMS of the pitot pressure fluctuations measured in the outgoing boundary layer for the shock-disturbed cases is about twice the value for the undisturbed case, at 25$\\delta\\sb{\\rm o}$ downstream of the origin the difference has vanished. It is possible that the more energetic structures causing the higher RMS in the case of shock wave-boundary layer interaction are partially responsible for the large growth rate enhancement near the shear layer origin. (4) There is evidence from the two-point correlations of fluctuating pitot pressures and from the VITA analysis that large-scale structures exist and they span the width of the shear layer. (5) Power spectra in both undisturbed and disturbed cases are broadband. In neither undisturbed or disturbed cases can a single Strouhal number be defined which characterizes the preferred frequency of the large-scale structures. It is probable that the measurements have been made in the transition region, in which a highly organized structure is only beginning to evolve. (Abstract shortened with permission of author.).Subjects--Topical Terms:

3433227
Aerospace materials.

Experimental study of growth rate enhancement and structure of compressible turbulent free shear layers.
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100 1 $a Shau, Yiowha Richard. $3 3434416
245 1 0 $a Experimental study of growth rate enhancement and structure of compressible turbulent free shear layers.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1990
300 $a 307 p.
500 $a Source: Dissertations Abstracts International, Volume: 52-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Dolling, David S.
502 $a Thesis (Ph.D.)--The University of Texas at Austin, 1990.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a An experimental investigation has been made in a Mach 5 blowdown tunnel of the effects of initial conditions on the growth rate of a high Reynolds number, compressible, turbulent shear layer which is bounded by Mach 5 and Mach 3 air streams. Mean pitot pressure profiles were used to determine the growth rate of the shear layers. Also, experiments have been conducted to determine if two-point fluctuating pitot pressure measurements can be used to detect and quantify the large-scale structure in the supersonic shear layer. Further, the effects of the initial conditions on the dynamics of the large-scale structures were investigated. (1) Two-dimensional or three-dimensional shocks incident on the shear layer have relatively little effect on the shear layer evolution. (2) The changes in the initial conditions caused by either planar shock waves or "corrugated" shock impingement on the turbulent boundary layer result in a large local increase in growth rate immediately downstream of the shear layer origin. (3) Although the RMS of the pitot pressure fluctuations measured in the outgoing boundary layer for the shock-disturbed cases is about twice the value for the undisturbed case, at 25$\\delta\\sb{\\rm o}$ downstream of the origin the difference has vanished. It is possible that the more energetic structures causing the higher RMS in the case of shock wave-boundary layer interaction are partially responsible for the large growth rate enhancement near the shear layer origin. (4) There is evidence from the two-point correlations of fluctuating pitot pressures and from the VITA analysis that large-scale structures exist and they span the width of the shear layer. (5) Power spectra in both undisturbed and disturbed cases are broadband. In neither undisturbed or disturbed cases can a single Strouhal number be defined which characterizes the preferred frequency of the large-scale structures. It is probable that the measurements have been made in the transition region, in which a highly organized structure is only beginning to evolve. (Abstract shortened with permission of author.).
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9105659