Aerodynamics of Low Reynolds Number Flyers by Wei Shyy, Yongsheng Lian, Jian Tang, Dragos Viieru, Hao Liu

By Wei Shyy, Yongsheng Lian, Jian Tang, Dragos Viieru, Hao Liu

Low Reynolds quantity aerodynamics is critical to a few usual and man-made flyers. Birds, bats, and bugs were of curiosity to biologists for years, and lively research within the aerospace engineering neighborhood, influenced through curiosity in micro air automobiles (MAVs), has been expanding swiftly. the first concentration of this ebook is the aerodynamics linked to fastened and flapping wings. The booklet examine either organic flyers and MAVs, together with a precis of the scaling laws-which relate the aerodynamics and flight features to a flyer's sizing at the foundation of easy geometric and dynamics analyses, structural flexibility, laminar-turbulent transition, airfoil shapes, and unsteady flapping wing aerodynamics. The interaction among flapping kinematics and key dimensionless parameters resembling the Reynolds quantity, Strouhal quantity, and decreased frequency is highlighted. some of the unsteady raise enhancement mechanisms also are addressed, together with modern vortex, speedy pitch-up and rotational stream, wake seize, and clap-and-fling.

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At a lower Reynolds number, Re = 4 × 104 , a long bubble after bursting is observed, causing significant impact on the velocity distribution. Finally, at Re = 2 × 104 , a complete separation with no reattachment is noticed. Here ue is the velocity at the boundary-layer edge parallel to the airfoil surface, and U0 is the free-stream velocity. The results are based on computations made with XFOIL (Drela, 1989). layer. At this Reynolds number, the separated flow no longer reattaches to the airfoil surface.

The pressure “plateau” is a typical feature of the laminar part of the separated flow. The dynamics of a LSB depends on the value of the Reynolds number, the pressure distribution, the geometry, the surface roughness, and the free-stream turbulence. 3. (a) Schematic flow structures illustrating the laminar–turbulent transition (Roberts, 1980) (copyright by AIAA). (b) Pressure distribution over an SD7003 airfoil, as predicted by XFOIL (Drela, 1989). reattachment point, is approximately 5 × 104 .

For example, the small fruit fly Drosophila melanogaster can be compared to the Boeing 747, which weighs about 500 billion times more. By using scaling analysis, one can predict how a parameter such as wingspan varies with another parameter such as the body mass for natural flyers in general or specific animal groups. As an illustration, consider the balance between lift and weight during steadystate flight, L = W = 1/2␳U 2 SCL. 3) From Eq. 3) it is possible to get an understanding of how wing area, airspeed, density, and wing loading are connected.

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