Vortex-Body Interactions

涡体相互作用

• 批准号: 9422432
• 负责人: Donald Rockwell
• 金额: $ 22.5万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-01 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9422432&HistoricalAwards=false
• 关键词: Vortex; Body; Interactions

ABSTRACT CTS-9422432 ROCKWELL LEHIGH The encounter of vortices with airfoils, blades and cylinders produces transient loading, flow-induced vibration, and noise generation. Basic types of vortices include: trailing (aircraft) vortices; microburst (wind shear) vortices; vortices from turbomachinery, wind turbine and helicopter blades; and vortices from heat exchanger tubes and raisers of ocean structures. The aim of this investigation is to determine the generic features of vortex-body interactions, when there is a defined motion of the body relative to the arrival of the incident vortex. Recently developed techniques of high-image-density particle image velocimetry will provide highly-resolved images of the instantaneous flow structure. These images will be interpreted using theoretical concepts that allow classification of the key physics of the instantaneous flow patterns. In turn, this knowledge of the flow patterns will provide insight into the loading on the body surface, which serves as the source of vibration of the body and noise radiation from it. With this understanding of vortex-body encounters, it should be possible to formulate new types of control techniques or maneuver schedules that alter the physics of the vortex encounter and minimize undesirable loading.

摘要CTS-9422432 ROCKWELL LEHIGH 涡流与翼型、叶片和圆柱体的碰撞产生瞬态载荷、流致振动和噪声。 涡流的基本类型包括：尾流（飞机）涡流;微下击流（风切变）涡流;来自涡轮机、风力涡轮机和直升机叶片的涡流;以及来自热交换器管道和海洋结构物的提升器的涡流。 本研究的目的是确定涡体相互作用的一般特征，当有一个定义的运动的身体相对于入射涡的到来。 最近开发的高图像密度粒子图像测速技术将提供高分辨率的瞬时流动结构的图像。 这些图像将解释使用理论概念，允许分类的关键物理的瞬时流动模式。 反过来，这种流动模式的知识将提供对物体表面载荷的深入了解，而物体表面是物体振动和噪声辐射的来源。有了这种对涡-体相遇的理解，就有可能制定新型的控制技术或机动计划，改变涡-体相遇的物理特性，并使不希望的载荷最小化。