Abstract
ABSTRACTThe main objective of this paper is an experimental and numerical study of airflow on a propulsive wing also called ventilated wing or FANWING, which is a drone operating at low speed. To optimize the aerodynamic shape of the Fanwing, two different configurations of NACA4415 rectangular wing profile were realized. The first one is a wing where the Cross-Flow Fan is fitted directly to the leading edge with a classic niche. For the second one, we truncated the extension of the niche to create a profile without nose. Two flow velocities with constant fan rotation were used and observed in the range of −16° < α < +30°. A lift coefficient generated by the profiles increases and the drag coefficient decreases, while the distribution of the pressure coefficient on the upper surface increases abruptly because of the flow recirculation. The experiment was performed in a subsonic wind tunnel TE44 and numerical simulations in software Fluent 6.3.2.6. Both approaches are in good agreement. The visualization showed that the recirculation phenomenon occurs right after the discharge of the cross-flow fan. It reveals that the jet coming out of the fan causes a strong wake behind the profile and suppresses the boundary layer separation.
Highlights
The physical study of the flow around the profiles is of great interest in understanding its behavior in order to predict the phenomenon of dynamic stall and stability
The CFD results predict that the lift coefficient (Figure 15) increases with the angle of attack up to α = 16°, the lift falls without stalling
Aeronautics has been using cross-flow fans as propulsion equipment for some years. Even if they develop with difficulty, their potential has enabled the Fanwing their implementation
Summary
The physical study of the flow around the profiles is of great interest in understanding its behavior in order to predict the phenomenon of dynamic stall and stability. These flows are complex and irregular generating swirling flows that can be detrimental in internal flows causing vibrations and system damage. The rotational flows are always captivating whether they are from a convective flow, generating a hurricane or formed by using a turbomachine or a rotor One of these devices is the crossflow fan, where the air is sucked by the cross-flow fan and stirred with the blades.
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