Aerodynamic characteristics of low-aspect-ratio prismatic bodies near a screen

1971 ◽  
Vol 3 (2) ◽  
pp. 73-74
Author(s):  
G. E. Khudyakov
Keyword(s):  
Aspect Ratio ◽  
Aerodynamic Characteristics ◽  
Low Aspect Ratio ◽  
Prismatic Bodies

Cross-Wind Influence on Low Aspect Ratio Wings at Low Reynolds Numbers

2013 ◽  
Author(s):  
Amir Karimi Noughabi ◽  
Mehran Tadjfar
Keyword(s):  
Aspect Ratio ◽  
Numerical Study ◽  
Three Dimensional ◽  
Micro Air Vehicles ◽  
Reynolds Numbers ◽  
Aerodynamic Characteristics ◽  
Low Aspect Ratio ◽  
Aspect Ratios ◽  
Lift And Drag ◽  
Lift And Drag Coefficient

The aerodynamics of the low aspect ratio (LAR) wings is of outmost importance in the performance of the fixed-wing micro air vehicles (MAVs). The flow around these wings is widely influenced by three dimensional (3D) phenomena: including wing-tip vortices, formation of laminar bubble, flow separation and reattachment, laminar to turbulent transition or any combination of these phenomena. All the recent studies consider the aerodynamic characteristics of the LAR wings under the effect of the direct wind. Here we focus on the numerical study of the influence of cross-wind on flow over the inverse Zimmerman wings with the aspect ratios (AR) between 1 and 2 at Reynolds numbers between 6×104 and 105. We have considered cross-wind’s angles from 0° to 40° and angle of attack from 0° to 12°. The results show that lift and drag coefficient generally decrease when the angle of the cross-wind is increased.

Thickness Effect on Low-Aspect-Ratio Wing Aerodynamic Characteristics at a Low Reynolds Number

2008 ◽  
Vol 24 (3) ◽  
pp. 223-228 ◽  
Author(s):  
F. B. Hsiao ◽  
C. Y. Lin ◽  
Y. C. Liu ◽  
D. B. Wang ◽  
C. C. Hsu ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Aspect Ratio ◽  
Low Reynolds Number ◽  
Aerodynamic Characteristics ◽  
Thickness Effect ◽  
Tip Vortices ◽  
Low Aspect Ratio ◽  
Aerodynamic Properties ◽  
Low Reynolds ◽  
Wing Tips

AbstractThis paper presents the study of aerodynamic performance about low-aspect-ratio wings at a low Reynolds number in wind tunnel testing. The aerodynamic properties, including lift, total drag, lift-to-drag ratio and induced drag were measured and analyzed for detailed investigations. Two forms of nonlinear equations of lift curves were reported for comparison. The effect of airfoil thickness was found to be significant on aerodynamic characteristics for all wings tested. The lift due to tip vortices was prominent for wings of AR =1.0 and their stall angles were all larger than 20°, which was mainly augmented by tip vortices shed from the wing tips.

Perspective: Unsteady Wing Theory—The Ka´rma´n/Sears Legacy

1993 ◽  
Vol 115 (4) ◽  
pp. 548-560 ◽  
Author(s):  
J. E. McCune ◽  
T. S. Tavares
Keyword(s):  
Aspect Ratio ◽  
Small Amplitude ◽  
Leading Edge ◽  
Aerodynamic Characteristics ◽  
Unsteady Motion ◽  
Low Aspect Ratio ◽  
Key Concepts ◽  
Edge Separation ◽  
Point Of Departure ◽  
Large Amplitude Motion

The aerodynamic analysis of wings and their vortex wakes is discussed from a perspective of its relation to the 1938 work of Ka´rma´n and Sears. The key concepts from this early paper on the analysis of airfoils in small amplitude unsteady motion are reviewed. These concepts are then used as a point of departure for developing techniques for calculating and interpreting the aerodynamic characteristics of both airfoils in large amplitude motion with deforming vortex wakes, and maneuvering low-aspect-ratio wings with leading-edge separation. Calculated examples are presented for this extended set of applications, and are compared to related analyses and experiments.

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