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 necessary to a few ordinary and man-made flyers. Birds, bats, and bugs were of curiosity to biologists for years, and energetic learn within the aerospace engineering group, influenced by way of curiosity in micro air cars (MAVs), has been expanding speedily. the first concentration of this publication is the aerodynamics linked to fastened and flapping wings. The e-book ponder 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 straightforward 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 reminiscent of the Reynolds quantity, Strouhal quantity, and diminished frequency is highlighted. some of the unsteady elevate enhancement mechanisms also are addressed, together with modern vortex, speedy pitch-up and rotational flow, wake seize, and clap-and-fling.

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However, such a picture is imprecise and needs to be examined carefully on a case by case basis. Flying animals use different mechanisms for various missions such as take-off, landing, or gliding. Even for forward flight, they change their wing and body movements while flying through a range of speeds. Tobalske and Dial (1996) analyzed videotapes of black-billed magpies (Pica pica) flying at speeds of 4–14 m/s and pigeons (Columbia livia) flying at 6–20 m/s in a wind tunnel. Pigeons have higher wing loading and higher aspect ratio wings compared with magpies.

The two drag components acting on a wing in steady flight are the induced drag (Dind ), which is the drag that is due to lift, and the profile drag (Dpro ), which is the drag associated with form and friction drag on the wing. The drag on a finite wing (Dw ) is the sum of these two components: Dw = Dind + Dpro . 26) The parasite drag (Dpar ), which is defined as the drag on the body and only on the body, also contributes to the total drag on the bird. This drag component is due to the form and friction drag of the “nonlifting” body (it is true that, if the body is tilted at an angle to the free stream, it will contribute to lift, but this contribution is very small and is neglected).

4 Concluding Remarks In this chapter, we have offered an overview of the various low Reynolds number flyers, highlighting flight characteristics and scaling laws related to wingspan, wing area, wing loading, and vehicle size and weight. The scaling laws indicate that, as a flyer’s size reduces, it has to flap faster to stay in air, experiences lower wing loading, is capable of cruising slower, has a lower stall speed, and consequently can survive much better in a crash landing. 19. Pectoralis power as a function of flight velocity.

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