Performance of the bio-inspired leading edge protuberances on a static wing and a pitching wing

• Published in: Journal of hydrodynamics. Series B Vol. 26; no. 6; pp. 912 - 920
• Main Author: 王雅赟 胡文蓉 张仕栋
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.01.2015; Springer Singapore
• Subjects: a pitching wing; a static wing; Computational fluid dynamics; Engineering; Engineering Fluid Dynamics; Fluid flow; Hydrology/Water Resources; Laminar flow; leading edge protuberance; Leading edges; Numerical and Computational Physics; Protuberances; Simulation; Stall; Turbulence; Turbulent flow; Vortices; 前缘涡; 动量交换; 机翼; 水动力性能; 流量控制机制; 涡流发生器; 生物; 静态; turbulent flow; laminar flow; a static wing; leading edge protuberance; a pitching wing
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(14)60100-1

It is shown that the leading edge protuberances on the flippers of a humpback whale can significantly improve the hydrodynamic performance. The present study numerically investigates the flow control mechanisms of the leading edge protuberances on a static wing and a pitching wing. For static wings, the performance in both laminar flow and turbulent flow are studied in the context of the flow control mechanisms. It is shown that the protuberances have slight effects on the performance of static wings in laminar flow. Also, it could be deduced that non-uniform downwash does not delay the stall occurrence in either laminar flow or turbulent flow. In turbulent flow, the leading edge protuberances act in a manner similar to vortex generators, enhancing the momentum exchange within the boundary layer. Streamwise vortices do contribute to the delay of the stall occurrence. The normal vorticity component also plays an important role in delaying the stall occurrence. However, for the pitching wing, the effect of leading edge protuberances is negligible in turbulent flow. Detailed analysis of the flow field indicates that for the wing with the leading edge protuberances, the leading edge vortices become more complex, while the thrust jet and the vortices in the wake are not changed significantly by the leading edge protuberances.