CAREER: An Experimental Investigation of the Flow Fields over Bio-Inspired and Finite Span Wings Undergoing Dynamic Stall

翼型是许多重要技术的核心组成部分，包括风力涡轮机、涡轮机械和飞机，更好地了解气流对翼型的持续发展至关重要。当一个翼型被放置在一个足够高的迎角，流动的表面可以分离造成损失的升力或失速。失速通常对性能有害。历史上，翼型动力学的研究集中在机翼放置在固定的迎角。这种观点是不够的，以描述在运动中的翼型的物理，其中发展的升力和失速角相当高。在这些条件下，升力的损失可能是突然的，导致气动和负载特性的快速变化。这种现象被称为动态失速（DS）。本实验研究将开发一种仿生策略来控制或延迟DS，并量化有限展弦比翼型前缘附近临界区域的速度和涡量场。动态失速在风力发电和高性能飞机这两项变革性技术的发展中起着关键作用。人们普遍预计，联合攻击战斗机将是美国国防部开发的最后一款有人驾驶战斗机。在极端机动中，动态失速是关键，移除飞行员增加了允许的力，从而提高了性能潜力。动态失速还会导致风力涡轮机叶片上的高非定常负荷，如果控制好，可以提高它们的性能和耐用性。由于缺乏有限跨机翼的实验数据，阻碍了预测模型的发展，并对其进行了研究。PI的教育目标包括开发大学和高中课程的新课程。研究生将通过担任本科生的导师获得经验，本科生将通过重点研究提高他们的教育经验。学生将通过克拉克森大学的管道项目（如NSF赞助的S-STEM项目）从代表性不足的群体中招募。以PI的研究为例，开发生物流体力学的高级问题为基础的本科课程，解决仿生学的概念。将与当地一所高中进行类似的合作。一旦开发完成，这些材料将通过克拉克森大学教育合作办公室分发给其他地区的教师。

0845882 Bohl Airfoils are central components of many important technologies, including wind turbines, turbomachinery and aircraft, and better understanding of flows over airfoils is critical to their continued development. When an airfoil is placed at a sufficiently high angle of attack, the flow over the surface can separate causing loss of lift or stall. Stall is usually detrimental to performance. Historically, the study of airfoil dynamics has centered on airfoils placed at fixed angles of attack. This view is insufficient to describe the physics of airfoils in motion, where the developed lift and the stall angle are considerably higher. Under these conditions the loss of lift can be abrupt causing rapid changes in the aerodynamic and loading characteristics. This phenomenon is known as dynamic stall (DS). This experimental study will develop a bio-inspired strategy to control or delay DS and quantify the velocity and vorticity fields in the critical region near the airfoil leading edge for finite aspect ratio airfoils.Dynamic stall plays a key role in the development of two transformational technologies: wind power generation and the development of high-performance aircraft. It is widely anticipated that the Joint Strike Fighter will be the last manned fighter developed for the US Department of Defense. Removing the pilot increases the performance potential by increasing the allowable forces experienced during extreme maneuvers for which dynamic stall is central. Dynamic stall also results in high unsteady loads on wind turbine blades which, if controlled, can increase their performance and durability. The lack of experimental data for finite span wings undergoing DS hinders the development of predictive models and represents. The PI's educational objectives include the development of new curricula for college and high school courses. Graduate students will gain experience by acting as mentors to the undergraduates who will enhance their educational experience through focused research. Students will be recruited from primarily under-represented groups using Clarkson University's pipeline programs such as the NSF sponsored S-STEM program. A senior-level problem-based undergraduate course in bio-fluid mechanics will be developed addressing the concept of biomimicry using the PI's research as a case example. A similar collaborative effort will be undertaken with a local high school. Once developed, these materials will be disseminated to other area teachers through the Clarkson University Office of Educational Partnerships.