Wake Measurements on Blended Wing Body with Gurney Flaps in Low Speed Flows

Low speed longitudinal aerodynamics of a blended wing-body re-entry vehicle

Aerospace Science and Technology ◽

10.1016/j.ast.2020.106303 ◽

2020 ◽

Vol 107 ◽

pp. 106303

Author(s):

Antonio Viviani ◽

Andrea Aprovitola ◽

Luigi Iuspa ◽

Giuseppe Pezzella

Keyword(s):

Low Speed ◽

Blended Wing Body

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Overview of Low-speed Aerodynamic Tests on a 5.75% Scale Blended-Wing-Body Twin Jet Configuration (Invited)

54th AIAA Aerospace Sciences Meeting ◽

10.2514/6.2016-0009 ◽

2016 ◽

Cited By ~ 5

Author(s):

Dan D. Vicroy ◽

Eric D. Dickey ◽

Norman Princen ◽

Michael Beyar

Keyword(s):

Low Speed ◽

Blended Wing Body

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Effect of Gurney Flaps on an Elliptical Airfoil

Journal of Fluids Engineering ◽

10.1115/1.4037037 ◽

2017 ◽

Vol 139 (10) ◽

Cited By ~ 1

Author(s):

Lance W. Traub

Keyword(s):

Reynolds Number ◽

Wind Tunnel ◽

Separated Flow ◽

Pitching Moment ◽

Airfoil Surface ◽

Low Speed ◽

Gurney Flaps ◽

Lift Curve ◽

The Impact ◽

Low Speed Wind Tunnel

A low-speed wind tunnel investigation is presented characterizing the impact of Gurney flaps on an elliptical airfoil. The chordwise attachment location and height of the flaps were varied, as was the Reynolds number. The results showed strong nonlinearities in the lift curve which were present for all tested geometries. Flap effectiveness was seen to diminish as the flap was moved closer to the trailing edge stemming from flap submersion in separated flow. For the tested cases, the measured lift coefficients showed a weak Re dependency. The upper airfoil surface was shown to carry approximately 80% of the total lift load. The top surface caused a pitching moment reversal associated with nonlinearity in the lift curve.

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The Effect of Canard on Aerodynamics of Blended Wing Body

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.110-116.4156 ◽

2011 ◽

Vol 110-116 ◽

pp. 4156-4160 ◽

Cited By ~ 2

Author(s):

M. Ali Zurriati ◽

Kuntjoro Wahyu ◽

Wirachman Wisnoe ◽

E.M Nasir Rizal

Keyword(s):

Wind Tunnel ◽

Deflection Angle ◽

Wind Tunnel Testing ◽

Scaled Model ◽

Low Speed ◽

Surface Deflection ◽

Blended Wing Body ◽

Drag Ratio ◽

Low Speed Wind Tunnel ◽

Lift To Drag Ratio

This paper describes the wind tunnel testing of a Blended Wing Body (BWB) with rectangular canards and twisted wing (Baseline II E2 configuration) developed in Universiti Teknologi MARA (UiTM). The experiment work was carried out in UiTM low speed wind tunnel using 1:6 scaled model of BWB at Mach 0.1. The testing is conducted for canard’s deflection angle between 0° to +20. The results show by adding the canard surface to the BWB’s body, at 12 degree and higher angles of attack,α there will be a slight increment in lift. Maximum lift-to-drag ratio decreases with increasing canard surface deflection. Also, by adding the canard surface, the value of moment at zero lift,CM,0 is increased.

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Blended-Wing-Body Low-Speed Flight Dynamics: Summary of Ground Tests and Sample Results (Invited)

47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition ◽

10.2514/6.2009-933 ◽

2009 ◽

Cited By ~ 20

Author(s):

Dan Vicroy

Keyword(s):

Flight Dynamics ◽

Low Speed ◽

Blended Wing Body

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New ultrastructural findings about Borrelia burgdorferi by cryofixation, negative staining, thin sectioning and scanning techniques

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100160467 ◽

1990 ◽

Vol 48 (3) ◽

pp. 582-583

Author(s):

S. F. Hayes ◽

M. D. Corwin ◽

T. G. Schwan ◽

D. W. Dorward ◽

W. Burgdorfer

Keyword(s):

Lyme Disease ◽

Borrelia Burgdorferi ◽

Structural Characterization ◽

Negative Staining ◽

Low Speed ◽

Thin Sectioning ◽

Ultrastructural Findings

Characterization of Borrelia burgdorferi strains by means of negative staining EM has become an integral part of many studies related to the biology of the Lyme disease organism. However, relying solely upon negative staining to compare new isolates with prototype B31 or other borreliae is often unsatisfactory. To obtain more satisfactory results, we have relied upon a correlative approach encompassing a variety EM techniques, i.e., scanning for topographical features and cryotomy, negative staining and thin sectioning to provide a more complete structural characterization of B. burgdorferi.For characterization, isolates of B. burgdorferi were cultured in BSK II media from which they were removed by low speed centrifugation. The sedimented borrelia were carefully resuspended in stabilizing buffer so as to preserve their features for scanning and negative staining. Alternatively, others were prepared for conventional thin sectioning and for cryotomy using modified procedures. For thin sectioning, the fixative described by Ito, et al.

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