CAREER: Morphing Surfaces for Flow Control

职业：用于流量控制的变形表面

• 批准号: 0747672
• 负责人: Beverley McKeon
• 金额: $ 40万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-03-15 至 2013-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0747672&HistoricalAwards=false
• 关键词: CAREER; Morphing; Surfaces; Flow; Control

CBET-0747672McKeonThis integrated research and education study investigates the physics associated with the interaction of boundary layer flows with morphing surfaces (defined here as thin skins capable of generating small, distributed or discrete, morphological or geometrical perturbations to the wall boundary condition). Fundamental questions to be addressed include how well can the characteristics of a boundary layer be manipulated via a morphing surface, what additional fundamental understanding of fluid physics can be gained from this new means of activation and how should graduate students best be prepared for this interdisciplinary research? An interdisciplinary approach will focus on: identification of the flow physics in new regimes that can now be interrogated using active materials; in situ characterization of the interaction between boundary layer flows and morphing surfaces; and investigation of open-loop actuation using surface morphing as a precursor to closed-loop control. Arrays of individually-addressable micro- or nano- actuators will be replaced with a coherent surface, or "skin" capable of either morphological changes or small adaptation of local geometry. Activation of properly designed morphing surfaces represents minimal control effort, with the potential for relatively simpler models relating the input to resultant structural changes in the flow. This research will expand our understanding of flow physics in receptive flows into a parameter range not previously accessible, or perhaps imaginable, before the advent of some newer materials. Classical hypotheses can then be revisited for canonical flows after the introduction of time-dependent wall motion and providing potential means for actuation for future closed-loop control work. Experiments on morphing surfaces also promise further insight into fundamental questions concerning a statically rough wall, mixing and vorticity flux in boundary layers. Broader impacts address environmental concerns and expanded air vehicle performance using active control or optimization of vehicular boundary layers via artificial manipulation of the boundary layer structure. This research will show how this could be achieved without large weight or structural penalties, and ultimately leading to a design feature for new vehicles. Collaborations with the active materials industry and a leading controls researcher seek to unite multiple fields to address this highly interdisciplinary topic. The educational goal is to develop a synergistic training scheme in flow control, suitable for addressing the research described here and educating graduate researchers to inhabit the middle ground between traditional disciplines associated with flow control, including fluid mechanics, control, dynamics and solid mechanics. This will culminate with a graduate level course designed to unify experimental, computational and modeling approaches to tackle advanced flow control problems. Outreach will target general public interest in fluid dynamics, with emphasis on girls of high school age and a continuing commitment to undergraduate research participation.

CBET-0747672 McKeon该综合研究和教育研究调查与边界层流与变形表面（此处定义为能够对壁边界条件产生小的，分布式或离散的，形态或几何扰动的薄蒙皮）相互作用相关的物理学。要解决的基本问题包括如何以及可以通过变形表面操纵边界层的特性，什么额外的流体物理学的基本理解可以从这种新的激活手段，以及研究生应该如何最好地准备这个跨学科的研究？一个跨学科的方法将集中在：识别的流动物理学在新的制度，现在可以询问使用活性材料;在原位表征边界层流和变形表面之间的相互作用;和调查开环驱动使用表面变形作为前体的闭环控制。可单独寻址的微致动器或纳米致动器的阵列将被替换为能够进行形态变化或局部几何形状的小调整的连贯表面或“皮肤”。激活适当设计的变形表面表示最小的控制工作，与相对简单的模型的潜力，相关的输入，从而产生的结构变化的流动。这项研究将扩大我们的理解，在接受流到一个参数范围内以前无法访问，或者可能是想象的，在一些新的材料出现之前，流物理学。经典的假设，然后可以被重新访问的规范流后，引入随时间变化的壁面运动，并提供潜在的手段，为未来的闭环控制工作的驱动。变形表面上的实验也承诺进一步深入了解有关静态粗糙壁，混合和涡通量边界层的基本问题。更广泛的影响，解决环境问题和扩大航空器的性能，使用主动控制或优化车辆边界层通过人工操纵边界层结构。这项研究将展示如何在没有大的重量或结构损失的情况下实现这一目标，并最终为新车带来设计特色。与活性材料行业和领先的控制研究人员的合作旨在联合多个领域来解决这个高度跨学科的主题。教育的目标是开发一个协同培训计划在流量控制，适合解决这里描述的研究和教育研究生居住与流量控制，包括流体力学，控制，动力学和固体力学传统学科之间的中间地带。这将最终与研究生水平的课程，旨在统一实验，计算和建模方法，以解决先进的流量控制问题。外联活动将针对公众对流体动力学的兴趣，重点是高中年龄的女孩，并继续致力于本科生的研究参与。