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 Bohl 翼型件是许多重要技术的核心部件，包括风力涡轮机、涡轮机械和飞机，更好地了解翼型件的流动对于其持续发展至关重要。当机翼处于足够高的迎角时，表面上的气流可能会分离，导致升力损失或失速。失速通常会损害性能。从历史上看，翼型动力学的研究主要集中在固定迎角的翼型上。这种观点不足以描述运动中机翼的物理特性，其中产生的升力和失速角相当高。在这些条件下，升力损失可能会突然导致空气动力学和负载特性的快速变化。这种现象称为动态失速（DS）。这项实验研究将开发一种仿生策略来控制或延迟 DS 并量化有限展弦比翼型翼型前缘附近关键区域的速度和涡度场。动态失速在两项转型技术的发展中发挥着关键作用：风力发电和高性能飞机的开发。人们普遍预计，联合攻击战斗机将是为美国国防部开发的最后一款有人驾驶战斗机。取消飞行员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允许力来增加性能潜力。动态失速还会导致风力涡轮机叶片产生高不稳定负载，如果控制住该负载，可以提高其性能和耐用性。有限翼展机翼接受 DS 的实验数据的缺乏阻碍了预测模型和表示的发展。 PI 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，本科生将通过重点研究来增强他们的教育经验。学生将主要从使用克拉克森大学管道项目（例如 NSF 赞助的 S-STEM 项目）的弱势群体中招募。将开发一门基于问题的高级生物流体力学本科课程，以 PI 的研究作为案例，讨论仿生学的概念。我们将与当地一所高中开展类似的合作工作。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。