U.S-Korea Cooperative Science: Cooperation on Design of Quiet Supersonic Ludwieg Tube with Boundary Layer Removal

9816258hornung该奖项提供资金，允许加州理工学院（Caltech）研究生航空实验室的Hans G. Hornung博士与浦项理工大学（POSTECH）机械工程系的Chung-Hwan Chun博士进行为期36个月的合作研究，设计一种具有边界层去除的安静超音速路德维格管。在实验室中，路德维格管原理被认为是产生低自由流噪声的超音速流动的主要候选之一。这对于研究超声速区层流向湍流过渡的重要问题是必要的。为了达到这种高流动质量，必须采取特殊措施防止供给管内的边界层进入加速喷嘴。最近在浦项工业大学进行的实验指出了如何最好地做到这一点。一旦投入使用，这两个机构的设施将用于教授实验课程和研究生研究。共同的利益和正在进行的项目，设计和建造安静的超音速路德维格管在加州理工学院和浦项工科大学，以及加州理工学院和浦项工科大学的合作者的互补能力和专业知识导致了这个项目的发展。两所院校都有各自的设施建设支持。该奖项将支持PI和一名研究生前往韩国，以便从信息交流中受益，特别是在设计中使用浦项工大和加州理工学院现有和新工作的结果。该项目与美韩合作科学项目的目标相关，该项目旨在通过科学信息、思想、技能和技术的交流以及在互利问题上的合作，提高美韩科学家和工程师之间的合作水平。韩国的参与得到了韩国科学与工程基金会（KOSEF）的支持

9816258HornungThis award provides funds to permit Dr. Hans G. Hornung, Graduate Aeronautical Laboratories, California Institute of Technology (Caltech), to pursue with Dr. Chung-Hwan Chun, Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), for 36 months, a program of cooperative research on the design of a quiet supersonic Ludwieg tube with boundary layer removal. The Ludwieg tube principle is recognized as one of the prime candidates for producing supersonic flow with low free-stream noise in the laboratory. This is necessary for the study of the important problem of transition from laminar to turbulent flow in the supersonic regime. In order to achieve this high flow quality, special measures have to be taken to prevent the boundary layer in the supply tube from entering the accelerating nozzle. Experiments performed recently at POSTECH have pointed the way to how this can best be done. Once operational, facilities at both institutions will be used in teaching laboratory courses and for graduate student research.Joint interests and ongoing projects to design and construct quiet supersonic Ludwieg tubes at Caltech and at POSTECH, and the complementary competence and expertise of the Caltech and POSTECH collaborators have led to the development of this project. Both institutions have separate support for the construction of their respective facilities. This award will support travel of the PI and a graduate student to Korea in order to benefit from the exchange of information, in particular for using results from existing and new work done at POSTECH and Caltech in the designs. This project is relevant to the objectives of the U.S.-Korea Cooperative Science Program which seeks to increase the level of cooperation between U.S. and Korean scientists and engineers through the exchange of scientific information, ideas, skills, and techniques and through collaboration on problems of mutual benefit. Korean participation is supported by the Korea Science and Engineering Foundation (KOSEF).***