US-Federal Republic of Germany Cooperative Research: Advanced Experimental Techniques and Turbulence Models for Turbulent Separated Flows

该奖项支持弗吉尼亚理工学院和州立大学（VPI）的Roger L. Simpson教授及其研究小组的其他人与德意志联邦共和国埃尔兰根大学流体力学小组的Franz Durst教授及其其他人在工程研究方面的合作。他们合作的目标是交流湍流分离流的先进实验技术，并根据他们集体积累的数据开发改进的分离流湍流模型。这两个小组在分离流的湍流结构和分离流的实验技术方面都处于领先地位。他们的经验和独特的设施是互补的。VPI主要研究非定常流场和三维外分离流场，并迅速发展了扫描激光风速测量和灵敏压力脉动测量技术。Erlangen小组专注于内部分离流动，如管道和其他流动通道，并且是开发先进激光风速测量技术的领导者。埃尔兰根的微型ldv设计和开发将允许VPI团队在动态风洞模型中构建和安装单元。VPI压力波动技术将应用于埃尔兰根的内部分离流动。分离流被公认为是飞机和海上交通工具、喷气发动机、导管流系统和其他实用设备性能的限制因素。在激光测风技术发展之前，人们对分离流的性质几乎没有基本的了解。在过去的15年中，VPI和Erlangen小组对湍流分离流动的基本理解做出了许多重大贡献。在拟议的支助下，这些小组将继续研究更复杂的分离问题。

This award supports Professor Roger L. Simpson and others in his research group at Virginia Polytechnic Institute and State University (VPI) for collaboration in engineering research with Professor Franz Durst and others of the Fluid Mechanics Group at the University of Erlangen, Federal REpublic of Germany. The objectives of their collaboration are to exchange advanced experimental techniques for turbulent separated flows and to develop improved turbulence models for separated flows based on their collective accumulation of data. Both groups are leaders in research on the turbulent structure of separated flows and in aspects of experimental techniques for separated flow. Their experience and unique facilities are complementary. VPI concentrates on unsteady and three-dimensional external separated flows and has developed rapidly scanning laser anemometry and sensitive pressure fluctuation measuring techniques. The Erlangen group concentrates on internal separated flows, such as in ducts and other flow passages, and is a leader in developing advanced laser anemometry techniques. The micro-LDV designs and developments in Erlangen will allow the VPI group to build and mount units in dynamic wind tunnel models. VPI pressure fluctuation techniques will be applied to internal separated flows in Erlangen. Separated flow is well recognized as the limiting factor to the performance of aircraft and sea vehicles, jet engines, ducted flow systems, and other practical devices. Until the development of laser anemometry, little basic understanding of the nature of separated flow was possible. In the last fifteen years, the VPI and Erlangen groups have made a number of significant contributions to the basic understanding of turbulent separated flow. Work on more complicated separation problems will be continued by these groups under the proposed support.