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Modeling the unsteady forces on a fi...

Capone, Dean Edward.

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Modeling the unsteady forces on a finite-length circular cylinder in cross-flow.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Modeling the unsteady forces on a finite-length circular cylinder in cross-flow./
作者:	Capone, Dean Edward.
面頁冊數:	217 p.
附註:	Adviser: Gerald C. Lauchle.
Contained By:	Dissertation Abstracts International60-07B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9937933
ISBN:	0599392290

Modeling the unsteady forces on a finite-length circular cylinder in cross-flow.
Capone, Dean Edward.

Modeling the unsteady forces on a finite-length circular cylinder in cross-flow. - 217 p.

Adviser: Gerald C. Lauchle.

Thesis (Ph.D.)--The Pennsylvania State University, 1999.

Semi-empirical models, for unsteady lift, drag, and axial forces, are developed to predict the spectral features of the unsteady forces on a finite-length, right circular cylinder in cross-flow. In general, the models consist of two parts; the spatial variation of rms wall pressure on the cylinder, and correlation the lengths, or areas, which describe the spatial extent of the correlation of the unsteady pressures. Experiments were conducted in a low noise wind tunnel to measure the statistics of the unsteady wall pressures on a model cylinder. The results from the measurements are incorporated into the theoretical models, and predictions are made for the spectral characteristics of the theoretical lift, drag, and axial forces.

ISBN: 0599392290Subjects--Topical Terms:

783786
Engineering, Mechanical.

Modeling the unsteady forces on a finite-length circular cylinder in cross-flow.
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035 $a (UnM)AAI9937933
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100 1 $a Capone, Dean Edward. $3 1250232
245 1 0 $a Modeling the unsteady forces on a finite-length circular cylinder in cross-flow.
300 $a 217 p.
500 $a Adviser: Gerald C. Lauchle.
500 $a Source: Dissertation Abstracts International, Volume: 60-07, Section: B, page: 3323.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 1999.
520 $a Semi-empirical models, for unsteady lift, drag, and axial forces, are developed to predict the spectral features of the unsteady forces on a finite-length, right circular cylinder in cross-flow. In general, the models consist of two parts; the spatial variation of rms wall pressure on the cylinder, and correlation the lengths, or areas, which describe the spatial extent of the correlation of the unsteady pressures. Experiments were conducted in a low noise wind tunnel to measure the statistics of the unsteady wall pressures on a model cylinder. The results from the measurements are incorporated into the theoretical models, and predictions are made for the spectral characteristics of the theoretical lift, drag, and axial forces.
520 $a The rms wall pressures on the cylindrical surface are found to have the largest amplitude near the endcap and in the rearward portion of the cylinder. The high levels in these locations are attributed to the separated flow region over the endcap. The circumferential and axial lengthscales decrease exponentially with Strouhal number. Both lengthscales exhibit maxima near the Strouhal shedding frequency of St = 0.21.
520 $a The rms wall pressures on the endcap are the highest at radial positions of 90 and 120° from the forward stagnation point. The wall pressure power spectra measured on the endcap are found to exhibit a significantly different spectral character than those measured on the cylindrical surface of the body. The energy in the endcap wall pressure power spectra is distributed much more uniformly over Strouhal number. The respective lengthscales measured on the endcap decay more slowly than those on the cylindrical surface. This is due to a greater abundance of low frequency, large scale, motions in the endcap flow field.
520 $a The unsteady lift and drag predictions using the models developed in this work agree well with previously measured unsteady force data measured on gradient hyrdophones exposed to flow. The unsteady lift is found to be greater than the unsteady drag by 1–4 dB. Below St = 0.8 the unsteady lift and drag are found to be the dominant force on the cylinder, while above St = 0.8 the unsteady axial force dominate.
590 $a School code: 0176.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Acoustics. $3 1019086
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690 $a 0986
710 2 0 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 60-07B.
790 $a 0176
790 1 0 $a Lauchle, Gerald C., $e advisor
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9937933