Enhancing Aerodynamic Efficiency of Flat-Plate Wings at Low Reynolds Number with Inverted Dimples
摘要
This study investigates the effectiveness of using inverted dimples as passive sub-boundary-layer vortex generators to enhance aerodynamic performance in low Reynolds number conditions. Inverted dimples were strategically positioned along the span at multiple points on the suction side of a flat plate with an aspect ratio of 2. The primary objective was to initiate early transition to turbulent flow, thereby destabilizing the predominantly laminar flow, which is more prone to separation under these conditions. The dimples, each with a diameter of approximately 1.0 mm and a height of about 0.5 mm, were designed to induce localized turbulence, providing energy to the separated layer and promoting reattachment to the surface. The study demonstrated that the use of inverted dimples effectively triggered the transition from laminar to turbulent flow, reducing flow separation and enhancing aerodynamic efficiency. Flow visualization images confirmed the impact of the dimples, showing smooth laminar flow upstream and turbulent reattachment downstream. These findings indicate that applying inverted dimples on wings, especially in ground effect scenarios, can significantly improve performance by optimizing airflow and reducing drag. This research contributes to the broader understanding of passive flow control techniques and their potential applications in various aerodynamic contexts. By leveraging the principles of fluid dynamics and biomimicry, the use of inverted dimples presents a promising approach to enhancing the efficiency of wings and other aerodynamic surfaces, particularly in low Reynolds number environments where flow separation is a critical issue. Further studies could explore the scalability and applicability of this technique in more complex aerodynamic systems.