2104 形状記憶合金を用いたボルテックスジェネレータの飛行中の空気力による変形可能性について(S06-1 形状記憶合金の特性と応用技術(1),S06 形状記憶合金の特性と応用技術)

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  • 2104 Deformability of Vortex Generator Made of Shape Memory Alloy due to Aerodynamic Force during Flight

説明

Vortex Generators (VGs) on airplane wings are devices designed to prevent or delay flow separation by generating vortexes and mixing a flow. Some of them are necessary only in take-off and landing because a flow on a wing surface separates. However, this type of VGs has an adverse effect in steady cruise conditions because they generate drag. Therefore, a new VG concept has been proposed, where the VGs autonomously transform their position between an upright vortex-generating position in take-off and landing and a flat drag-reducing position in steady cruise conditions by using shape memory alloy (SMA) and approximately 70℃ difference in ambient temperature between the ground and the cruise altitude. In this paper, an aerodynamic force applied to the SVG during a flight is calculated by a commercial CFD program and deformability of the SVG due to the aerodynamic force is investigated. The SVG composed of two-way SMA can transform between the two positions. While, for the SVG composed of one-way SMA, the aerodynamic force is too weak to lie down, but it can move to the drag reducing position, not flat, by reducing the stiffness of the SVG.

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