权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Fundamental Study on Interaction between Vortex Ring / Vortex Pair and a Solid Surface

涡环/涡对与固体表面相互作用的基础研究

基本信息

批准号：
08650199
负责人：
YAMADA Hideo
金额：
$ 0.96万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

This report is mainly an experimental one about a vortex ring and a vortex pair. According to the vortex theorem a vortex must be closed by itself or must touch a boundary. A vortex ring has the former configuration, while a vortex pair, produced experimentally in a laboratory, the letter one. A vortex ring and a vortex pair thus can be called elementary in this sense. Though thses vortices are elementary, they often play a crucial role in various flow fields. A vortex ring has characteristics such as stretching, twisting, vorticity concentration, diffusion, wavy distortion of a core, and entrainment of the ambient fluid. A turbulent flow genarally contains such phenomena with some complexity. Thus, the study of a vortex ring or a vortex pair is not only interesting in itself but important in the basic study of a turbulent flow.Recently, the mutual interaction between a vortex and a solid wall has drawn attention as an important research subject in vortex dynamics. The significance of the present study lies in its basic and important findings about the flow field of the vortex interaction mentioned above. In this study we have chosen two kinds of solid surface a flat wall and a thin circular cylinder. The former is the fundamental when considering the interaction with a solid body ; the latter is not only fundamental but important from the viewpoint of engineering application. In this report the smoke visualization method is extensively applied in measuring flow fields. The results have been reported in Nagare, in a paper presented at the 7th Asian Congress of Fluid Mechanics, and in a partial contribution to a doctoral thesis by Naitoh, a coinvestigator in this research program.

这篇报告主要是关于涡环和涡旋对的实验报告。根据涡旋定理，涡旋必须自行闭合或必须接触边界。涡环具有前一种配置，而涡旋对是在实验室中通过实验产生的，即字母一。因此，在这个意义上，涡环和涡对可以被称为基本的。尽管这些涡流是基本的，但它们通常在各种流场中发挥着至关重要的作用。涡环具有诸如拉伸、扭曲、涡量集中、扩散、核心的波状畸变以及环境流体的夹带等特性。湍流通常包含这种具有一定复杂性的现象。因此，涡环或涡对的研究不仅本身很有趣，而且对于湍流的基础研究也很重要。近年来，涡与固体壁之间的相互作用作为涡动力学中的一个重要研究课题引起了人们的关注。本研究的意义在于对上述涡相互作用流场的基本而重要的发现。在这项研究中，我们选择了两种固体表面：平壁和薄圆柱体。前者是考虑与固体相互作用时的基础；后者不仅是基础性的，而且从工程应用的角度来看也很重要。在本报告中，烟雾可视化方法广泛应用于流场测量。该研究结果已在《Nagare》第七届亚洲流体力学大会上发表的一篇论文中进行了报道，同时该研究项目的共同研究员 Naitoh 也对博士论文做出了部分贡献。