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We have been requiring more precise knowledge about the aerodynamic characteristics of airfoils especially in a low-Reynolds-number range less than 106, because of the recent miniaturisation of robots... such as unmanned aerial vehicles known as UAVs or micro air vehicles known as MAVs, in addition to the importance of insect/bird flight dynamics, small-scale machines like micro fluid machineries and micro combustion engines and so on.In the present studys we investigate the relationship between various aerodynamic characteristics and attack angle α for FP (a flat plate), NACA0015 and iNACA0015 (the NACA0015 placed back to front) by numerical analysis and water-tank experiment at Re= 1.0×10^2-8.0×10^2. Then, we reveal the effects ofαupon various aerodynamic characteristics such as the lift coefficient C_L,drag coefficient C_D and the lift-to-drag ratio CL/CD. In order to discuss the revealed α effects, we further visualise the flow around the airfoils using the Q value, helicity and streamlines at α= 0 –24 deg., together with PIV analysis based on water-tank experiment. Such results suggest that FP is similar not with NACA0015 but with iNACA0015 from an aerodynamic point of view.続きを見る
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