Vortex-Body Interactions

CTS-9422432 Rockwell LeHigh涡流与翼型、叶片和圆柱体相遇时会产生瞬时载荷、流致振动和噪声。基本类型的涡旋包括：(飞机)尾涡；微爆发(风切变)涡；来自涡轮机械、风力涡轮机和直升机叶片的涡流；以及来自热交换器管和海洋结构物提升器的涡流。这项研究的目的是确定涡旋-物体相互作用的一般特征，当存在相对于入射涡旋到达的明确运动时。最近发展起来的高图像密度粒子图像测速技术将提供瞬时流动结构的高分辨率图像。这些图像将使用理论概念进行解释，这些概念允许对瞬时流动模式的关键物理进行分类。反过来，这种对流型的了解将提供对物体表面载荷的洞察，作为物体振动和噪声辐射的来源。有了对涡体相遇的了解，就有可能制定出新类型的控制技术或机动时间表，改变涡体相遇的物理特性，并将不必要的载荷降至最低。

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.