An Experimental Investigation of Wall Pressure Fluctuations Beneath Non-equilibrium Turbulent Flows PDF Download
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Author: Theodore M. Farabee
Publisher:
ISBN:
Category :
Languages : en
Pages : 456
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Book Description
Author: Theodore M. Farabee
Publisher:
ISBN:
Category :
Languages : en
Pages : 456
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Book Description
Author: Mark E. Kammeyer
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 314
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Book Description
Author: Paul Zoccola (Jr., J.)
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 200
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Book Description
Author: Mark E. Kammeyer
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 0
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Book Description
Author: Michael C. Goody
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: John S. Serafini
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 88
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Book Description
This experimental study was carried out at a free-stream Mach number of 0.6 and a Reynolds number per foot of 3.45 x 106. The magnitudes of the wall-pressure fluctuations agree with the Lilley-Hodgson theoretical results. Space-time correlations of the wall-pressure fluctuations generally agree with Willmarth's results for longitudinal separation distances. The convection velocity of the fluctuations is found to increase with increasing separation distances, and its significance is explained. Measurements with the longitudinal component of the velocity fluctuations indicate that the contributions to the wall-pressure fluctuations are from two regions, an inner region near the wall and an outer region linked with the intermittency.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 456
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: William W. Willmarth
Publisher:
ISBN:
Category :
Languages : en
Pages : 23
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Book Description
The structure of the fluctuating flow field in a turbulent boundary layer has been investigated with the aid of extremely small hot wire probes. Two investigations were conducted. In one investigations of a small X array hot-wire probe, with dimensions (length and spacing) of the order of 2.5 viscous lengths (100 Microns) was constructed and used to measure the small scale structure of the velocity fluctuations and the Reynolds stress near the wall. It was found that very small, intense contributions to the Reynolds stress occur with a scale of the order of the viscous length. In the other investigation a pair of single hot-wires which were of a length of the order of one half the viscous length (50 Microns) were used to demonstrate the existence of shear layers near the wall with an intensity comparable to the mean shear stress at the wall. One primary results is when large scale turbulence is present in the flow upstream of the cylinder, large amplitude, low frequency circumferentially averaged pressure fluctuations are caused by pressure fluctuations in the free stream turbulence and by the aerodynamic interaction of cylinder with the free stream turbulence. A three-sensor hot-wire probe was used to measure the three components of the velocity fluctuations in the free stream at a point 3.5 diameters from the axis of the cylinder. When the free stream turbulence level was low, the instantaneous average of the pressure fluctuations around the circumference could be estimated from the free stream velocity fluctuations near the measuring point on the cylinder.
Author: Aziz Mourad Mohsen
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 122
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Book Description
Author: T. J. Mueller
Publisher: Springer Science & Business Media
ISBN: 9783540417576
Category : Science
Languages : en
Pages : 344
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Book Description
The book describes recent developments in aeroacoustic measurements in wind tunnels and the interpretation of the resulting data. The reader will find the latest measurement techniques described along with examples of the results.
