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

职业生涯：仿生有限翼展机翼动态失速流场的实验研究

• 批准号: 0845882
• 负责人: Douglas Bohl
• 金额: $ 40万
• 依托单位: Clarkson University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2016-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0845882&HistoricalAwards=false
• 关键词: CAREER; Experimental; Investigation; Flow; Fields

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.

0845882波尔翼型是许多重要技术的核心部件，包括风力涡轮机、透平机械和飞机，而更好地了解翼型上的流动对于它们的持续发展至关重要。当翼型处于足够大的攻角时，表面上的流动可能会分离，导致升力损失或失速。失速通常不利于性能。历史上，对翼型动力学的研究主要集中在固定攻角的翼型上。这种观点不足以描述运动中的翼型的物理特性，那里的发展升力和失速角相当大。在这种情况下，升力的损失可能是突然的，导致空气动力和载荷特性的快速变化。这种现象称为动态失速(DS)。这项实验研究将开发一种受生物启发的策略来控制或延迟DS，并量化有限展弦比翼型前缘附近临界区的速度场和涡量场。动态失速在风力发电和高性能飞机的开发这两项变革性技术的发展中起着关键作用。人们普遍预计，联合打击战斗机将是为美国国防部开发的最后一款载人战斗机。移除飞行员可以通过增加在以动态失速为中心的极端机动过程中所经历的许用力来增加性能潜力。动态失速还会导致风力涡轮机叶片上的高非定常载荷，如果加以控制，可以提高其性能和耐用性。缺乏有限跨距机翼的试验数据阻碍了预测模型和代表的发展。该协会的教育目标包括为大学和高中课程开发新课程。研究生将通过担任本科生的导师来获得经验，本科生将通过专注的研究来增强他们的教育经验。学生将使用克拉克森大学的流水线项目，如美国国家科学基金会赞助的S-STEM项目，从代表不足的群体中招生。将开发一门以生物流体力学为基础的高级问题本科生课程，以PI的研究为案例，阐述生物仿生学的概念。将与当地一所高中开展类似的合作努力。一旦编写完成，这些材料将通过克拉克森大学教育伙伴关系办公室分发给其他领域的教师。