Turbulence and Vortex Interactions with Shock Waves

湍流和涡旋与冲击波的相互作用

• 批准号: 9104767
• 负责人: Yiannis Andreopoulos
• 金额: --
• 依托单位: CUNY City College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-08-01 至 1995-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9104767&HistoricalAwards=false
• 关键词: Turbulence; Vortex; Interactions; Shock; Waves

This research project is designed to investigate experimentally the interaction of a shock wave first with homogeneous/isotropic flow and second with a longitudinal or traverse vortex in the so called vorticity mode. Specifically, the research will focus on the phenomenon of turbulence and vorticity amplification across an unsteady shock propagating inside the flow and the distortion/deformation of the shock by turbulence or vortex. A shock wave which is formed inside a shock tube, passes through a grid and the induced flow behind the shock has the features of a compressible flow with free stream turbulence. The decaying turbulence is subjected to interaction with the reflected shock and travelling in the opposite direction. In the vortex/shock wave interaction, the induced flow over a transverse circular cylinder or a small delta wing at incident will generate the required vortices with transverse or longitudinal vorticity respectively. Preliminary results indicate that turbulence amplification is not the same for all investigated turbulence intensities and length scales during interactions with the shock waves of the same strength. The proposed program with its unique characteristics will provide the opportunity to a number of minority students in Mechanical Engineering to participate in an advanced research project aimed at a better understanding of compressible turbulence. Minority students will be exposed to the-state-of-the-art in experimental and computational techniques and, therefore, will be encouraged to enter research careers.

本研究项目旨在调查 在实验上，冲击波首先与 均匀/各向同性流和第二个纵向或 在所谓的涡度模式中穿过涡。 具体而言，研究将集中在以下现象： 非定常湍流和涡量放大 激波在流内传播， 湍流或涡流引起的激波扭曲/变形。 在激波管内形成的激波， 激波后的诱导流具有 可压缩自由流的特性 急流. 衰减的湍流受到 与反射的冲击波相互作用， 反方向。 在涡流/激波相互作用中， 本文研究了横向圆柱或圆柱上的诱导流， 小三角翼在事件将产生所需的 横向涡或纵向涡 分别 初步结果显示， 放大是不一样的所有调查 相互作用期间的湍流强度和长度尺度 同样强度的冲击波 拟议 该计划以其独特的特点将提供 为少数民族学生提供机械方面的机会 工程师参与一个高级研究项目 旨在更好地理解可压缩湍流。 少数民族学生将接触到最先进的， 实验和计算技术，因此， 将被鼓励从事研究工作。