US-Japan Joint Seminar: Abnormal Flow Phenomena in Turbomachines-From Avoidance to Suppression and Control

该奖项支持美国科学家和工程师参加将于1998年10月26日至29日在日本大阪举行的“叶轮机中的异常流动现象——从避免到抑制和控制”美日研讨会。联合组织者是约翰霍普金斯大学的约瑟夫卡茨教授和日本大阪大学的Oshinobu Tsujimoto教授。研讨会将集中讨论潜在的流动机制，现有的检测、计算和测量方法，以及现有的和将来可能的有效对策。为了满足更高的性能要求和更广泛的应用，涡轮机器正在越来越苛刻的条件下使用。在这种条件下，会出现旋转空化、旋转失速、喘振、大量流动分离等各种“异常”流动现象。除了对性能产生不利影响并导致振动和噪音增加外，这些异常现象可以并且确实经常导致组件和系统故障。因此，除了满足传统的设计目标，如提高性能和效率外，了解导致这些异常现象的潜在机制并制定有效的应对措施变得越来越重要。参与者将清楚地识别主导流现象，并建议避免、抑制和控制的策略。美国研究人员在理论、计算和实验研究工具方面经验丰富，而日本研究人员在流动的基础和实践方面具有专业知识。研讨会汇集了来自学术界、工业界和政府的研究人员。此外，还将包括博士后研究人员。与该领域的日本专家交流想法和数据将使美国参与者能够推进自己的工作，并将为未来的合作项目奠定基础。＊＊＊

9726626 Katz This award supports the participation of American scientists and engineers in a U.S.-Japan seminar on Abnormal Flow Phenomena in Turbomachines -- From Avoidance to Suppression and Control, to be held in Osaka, Japan from October 26-29, l998. The co-organizers are Professors Joseph Katz of Johns Hopkins University and Oshinobu Tsujimoto of Osaka University in Japan. The seminar will focus on the underlying flow mechanisms, available means to detect, compute and measure them, as well as existing and potential future effective countermeasures for them. Turbomachines are being used in increasingly more severe and demanding conditions in order to meet higher performance requirements and a wider range of applications. Under such conditions, various kinds of "abnormal" flow phenomena, such as rotating cavitation, rotating stall, surge, and massive flow separation occur. Besides having adverse effects on the performance and causing increased levels of vibrations and noise, these abnormal phenomena can and do regularly lead to component and system failures. Thus, in addition to meeting conventional design targets, such as improvements in the performance and efficiency, it is becoming increasingly important to understand the underlying mechanisms causing these abnormal phenomena and develop effective counter-measures against them. The participants will develop clear identification of the dominating flow phenomena and recommended strategies for avoidance, suppression and control. The U.S. researchers are experienced in theoretical, computational and experimental research tools while the Japanese have expertise in the fundamental and practical aspects of flows. The seminar brings together researchers from academia, industry and government. In addition, postdoctoral researchers will be included. The exchange of ideas and data with Japanese experts in this field will enable U.S. participants to advance their own work, and will set the stage for fu ture collaborative projects. ***