Implicit LES Simulations of a Low Reynolds Number Flexible Membrane Wing Airfoil

2009 ◽  
Author(s):  
Raymond Gordnier ◽  
Peter Attar
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Flexible Membrane ◽  
Membrane Wing ◽  
Low Reynolds ◽  
Wing Airfoil

Aerodynamic Control of Micro Air Vehicle Wings Using Electroactive Membranes

2011 ◽  
Author(s):  
Michael R. Hays ◽  
Jeffrey Morton ◽  
William S. Oates ◽  
Benjamin T. Dickinson
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Membrane Surface ◽  
Three Dimensional ◽  
Visual Image ◽  
Image Correlation ◽  
Structural Shape ◽  
Electrostatic Fields ◽  
Membrane Wing ◽  
Low Reynolds

Electrically controlled adaptive materials are ideal candidates for developing high agility micro-air-vehicles (MAV) due to their intrinsic multi-functionality. The dielectric elastomer VHB 4910 is one such material, where deformation occurs with an applied electric field. Here, we study the aerostructural response and control authority of a VHB 4910 membrane wing. An experimental membrane-wing platform was constructed by stretching VHB 4910 over a rigid elliptical wing-frame. The low Reynolds number (chord Reynolds number < 106) aerodynamics of the elliptical wing were characterized with different electrostatic fields applied. We observe an overall increase in lift with maximum gains of 20% at 4.5 kV, and demonstrate the ability to delay stall. Aerodynamic effects are investigated with membrane displacement and strain data obtained through visual image correlation (VIC). The VIC data is compared to a finite deforming finite element shell model to help understand structural shape changes under electrostatic fields and low Reynolds number aerodynamic flows. The model is formulated to directly input three dimensional membrane displacements to quantify aerodynamic loads on the electroactive membrane surface.

Membrane Wing-Based Micro Air Vehicles

2005 ◽  
Vol 58 (4) ◽  
pp. 283-301 ◽  
Author(s):  
Wei Shyy ◽  
Peter Ifju ◽  
Dragos Viieru
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Optimization Technique ◽  
Micro Air Vehicles ◽  
Flight Speed ◽  
Tip Vortex ◽  
Flexible Wing ◽  
Membrane Wing ◽  
Low Reynolds ◽  
Air Vehicles

Micro air vehicles (MAVs) with a wingspan of 15cm or shorter, and flight speed around 10m∕s have attracted substantial interest in recent years. There are several prominent features of MAV flight: (i) low Reynolds number (104-105), resulting in degraded aerodynamic performance, (ii) small physical dimensions, resulting in certain favorable scaling characteristics including structural strength, reduced stall speed, and impact tolerance, and (iii) low flight speed, resulting in order one effect of the flight environment and intrinsically unsteady flight characteristics. Flexible wings utilizing membrane materials are employed by natural flyers such as bats and insects. Compared to a rigid wing, a membrane wing can better adapt to the stall and has the potential for morphing to achieve enhanced agility and storage consideration. We will discuss the aerodynamics of both rigid and membrane wings under the MAV flight condition. To understand membrane wing performance, the fluid and structure interaction is of critical importance. Flow structures associated with the low Reynolds number and low aspect ratio wing, such as pressure distribution, separation bubble, and tip vortex, as well as structural dynamics in response to the surrounding flow field are discussed. Based on the computational capabilities for treating moving boundary problems, an automated wing shape optimization technique is also developed. Salient features of the flexible-wing-based MAV, including the vehicle concept, flexible wing design, novel fabrication methods, aerodynamic assessment, and flight data analysis are highlighted.

Experimental Investigation on Blunt-Edged UTM Delta Wing VFE-2 Configurations at Low Reynolds Number

2018 ◽  
Vol 12 (3) ◽  
pp. 255
Author(s):  
Muhammad Zal Aminullah Daman Huri ◽  
Shabudin Bin Mat ◽  
Mazuriah Said ◽  
Shuhaimi Mansor ◽  
Md. Nizam Dahalan ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Reynolds Number ◽  
Delta Wing ◽  
Low Reynolds Number ◽  
Low Reynolds

HEAT TRANSFER OF IMPINGING JET AT LOW REYNOLDS NUMBER

2018 ◽  
Author(s):  
Vadim V. Lemanov ◽  
Viktor I. Terekhov ◽  
Vladimir V. Terekhov
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Low Reynolds Number ◽  
Impinging Jet ◽  
Low Reynolds
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