International Research Fellow Awards Program: An Experimental Study of the Stability and Wake Dynamics of a Reentry Capsule at Low Speed

国际研究员奖励计划：低速再入舱稳定性和尾流动力学的实验研究

• 批准号: 9600318
• 负责人: Frank Wang
• 金额: $ 3.54万
• 依托单位: Fellowships
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9600318&HistoricalAwards=false
• 关键词: International; Research; Fellow; Awards; Program

9600318 Wang The International Research Fellow Awards Program enables U.S. scientists and engineers to conduct three to twenty- four months of research abroad. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions abroad. This award will support a twelve-month postdoctoral research visit which will support Dr. Frank Y. Wang to work with Professor Jean-Marc Charbonnier at the von Karman Institute for Fluid Dynamics in Belgium. This project involves investigating experimentally the dynamic stability characteristics of a reentry capsule and their relation to the downstream wake flow at low speed. Dr. Wang and Professor Charbonnier will measure aerodynamic coefficients of a capsule-like body, mean and turbulent quantities of the boundary layer and the downstream wake flows, and do flow visualization. An existing support system specifically designed for the investigation of the stability of capsule-like bodies will be used for both mounting the model and measuring its global aerodynamic coefficients. Shadowgraph/Schlieren visualization will be utilized as an initial step to globally characterize the wake flow. The flow diagnostic effort will then concentrate on the use of particle image velocimetry (PIV) to map out the boundary layer and wake characteristics. In addition, a parallel investigation of the flow fields using conventional miniature five-hole probes will be carried out to address the applicability of the PIV technique in this type of problems. The measurement of aerodynamic coefficients is crucial in providing the necessary information to ensure the safe return of astronauts. The detailed documentation of the boundary layer and wake flow fields will broaden the existing database for transonic blunt bodies, aiding the development and validation of computational models, as well as offering an unprecedented opportunity to examine the dynamic interaction between the flow over the capsule and its downstream wake. ***

9600318国际研究员奖计划使美国科学家和工程师能够在国外进行三到二十四个月的研究。该计划的奖项为联合研究提供了机会，以及在国外使用独特或补充设施，专业知识和实验条件。 该奖项将支持十二个月的博士后研究访问，该访问将支持弗兰克·Y. Wang博士与比利时冯·卡尔曼流体动力学研究所的让·马克·夏伯尼教授合作。 该项目涉及在实验上研究重新进入胶囊的动态稳定性特性及其与低速下游尾流的关系。 Wang博士和Charbonnier教授将测量胶囊样体的空气动力系数，边界层和下游尾流的平均值和湍流数量，并进行流动可视化。 专门针对研究类似胶囊的稳定性的现有支持系统将用于安装模型和测量其全球空气动力系数。 Shadowgraph/Schlieren可视化将被用作全球表征唤醒流的第一步。 然后，流程诊断工作将集中于使用粒子图像速度法（PIV）来绘制边界层和唤醒特征。 此外，将对使用常规微型五孔探针对流场进行平行研究，以解决PIV技术在此类问题中的适用性。 空气动力系数的测量对于提供必要的信息以确保宇航员的安全返回至关重要。 边界层和尾流场的详细文档将扩大跨性别钝体的现有数据库，有助于计算模型的开发和验证，并提供前所未有的机会，以检查胶囊上流及其下游唤醒之间的动态交互。 ***