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Large scale homogeneous turbulence a...

Larssen, Jon Vegard.

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Large scale homogeneous turbulence and interactions with a flat-plate cascade.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Large scale homogeneous turbulence and interactions with a flat-plate cascade./
Author:	Larssen, Jon Vegard.
Description:	227 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1008.
Contained By:	Dissertation Abstracts International66-02B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3164119
ISBN:	0496983857

Large scale homogeneous turbulence and interactions with a flat-plate cascade.
Larssen, Jon Vegard.

Large scale homogeneous turbulence and interactions with a flat-plate cascade. - 227 p.

Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1008.

Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2005.

The turbulent flow through a marine propulsor was experimentally modeled using a large cascade configuration with six 33 cm chord flat plates spanning the entire height of the test section in the Virginia Tech Stability Wind Tunnel. Three-component hot-wire velocity measurements were obtained ahead, throughout and behind both an unstaggered and a 35° staggered cascade configuration with blade spacing and onset turbulence integral scales on the order of the chord. This provided a much needed data-set of much larger Taylor Reynolds number than previous related studies and allowed a thorough investigation of the blade-blocking effects of the cascade on the incident turbulent field.

ISBN: 0496983857Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Large scale homogeneous turbulence and interactions with a flat-plate cascade.
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035 $a AAI3164119
040 $a UnM $c UnM
100 1 $a Larssen, Jon Vegard. $3 1937783
245 1 0 $a Large scale homogeneous turbulence and interactions with a flat-plate cascade.
300 $a 227 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1008.
500 $a Chair: William J. Devenport.
502 $a Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2005.
520 $a The turbulent flow through a marine propulsor was experimentally modeled using a large cascade configuration with six 33 cm chord flat plates spanning the entire height of the test section in the Virginia Tech Stability Wind Tunnel. Three-component hot-wire velocity measurements were obtained ahead, throughout and behind both an unstaggered and a 35° staggered cascade configuration with blade spacing and onset turbulence integral scales on the order of the chord. This provided a much needed data-set of much larger Taylor Reynolds number than previous related studies and allowed a thorough investigation of the blade-blocking effects of the cascade on the incident turbulent field.
520 $a In order to generate the large scale turbulence needed for this study, a mechanically rotating "active" grid design was adopted and placed in the contraction of the wind tunnel at a streamwise location sufficient to cancel out the relatively large inherent low frequency anisotropy associated with this type of grid. The resulting turbulent flow is one of the largest Reynolds number (Relambda ≈ 1000) homogeneous near-isotropic turbulent flows ever created in a wind tunnel, and provided the opportunity to investigate Reynolds number effects on turbulence parameters, especially relating to inertial range dynamics. Key findings include (1) that the extent of local isotropy is solely determined by the turbulence generator and the size of the wind-tunnel that houses it; and (2) that the turbulence generator operating conditions affect the shape of the equilibrium range at fixed Taylor Reynolds number. The latter finding suggests that grid turbulence is not necessarily self-similar at a given Reynolds number independent of how it was generated.
520 $a The experimental blade-blocking data was compared to linear cascade theory and showed good qualitative agreement, especially for wavenumbers above the region of influence of the wind tunnel and turbulence generator effects. As predicted, the turbulence is permanently modified by the presence of the cascade after which it remains invariant for a significant downstream distance outside the thin viscous regions. The obtained results support the claim that Rapid Distortion Theory (RDT) is capable of providing reasonable estimates of the flow behind the cascade even though the experimental conditions lie far outside the predicted region of validity.
590 $a School code: 0247.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Marine and Ocean. $3 1019064
690 $a 0538
690 $a 0547
710 2 0 $a Virginia Polytechnic Institute and State University. $3 1017496
773 0 $t Dissertation Abstracts International $g 66-02B.
790 1 0 $a Devenport, William J., $e advisor
790 $a 0247
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3164119