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Active Control of Flow Separation and Vortex-induced Vibration

来源:研究生院  编辑:张铎     日期:2019/3/19 10:11:27   点击数:1598  

时间:2019-03-22 10:00

地点:九里校区行政楼240会议室

报告人:唐辉 副教授

 

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讲座时间:2019年3月22日(周五),上午10:00-11:30

讲座地点:九里校区行政楼240会议室

讲座题目:Active Control of Flow Separation and Vortex-induced Vibration

主 讲 人:唐辉  副教授  香港理工大学机械工程系

个人概况:

唐辉博士在香港理工大学机械工程系任副教授、航空航天工程与民航研究会主任、流固耦合研究中心副主任。他本科和硕士毕业于清华大学工程力学系,博士毕业于英国曼彻斯特大学航空工程。在加入香港理工大学之前,唐博士曾先后于美国密歇根大学船舶与海洋工程系和新加坡南洋理工大学宇航与机械工程学院从事博士后和教职工作。他的研究领域包括空气/水动力学、主动流动控制、流固耦合和传热传质,目前已经发表了九十余篇期刊/会议文章。唐博士曾参与了多个相关国际学术会议的组织和评选工作,目前他是香港力学协会实行委员会成员。

讲座内容:

In this talk, the use of active control for flow separation delay and vortex-induced vibration (VIV) suppression will be introduced. Here the term "active control" means that the control is realized by injecting a small amount of energy into the existing flow system. Compared to its counterpart, i.e., passive control, active control is adaptive and on-demand, and hence has a much wider operating range. Two types of active flow control methods are presented: one is synthetic jet (SJ) and the other is windward-suction-leeward-blowing (WSLB). Both methods are capable of injecting non-zero momentum into ambient flows with zero net mass flux. Three case studies will be introduced: First, an SJ array is implemented on a low-speed wing to control flow separation so as to improve the wing's aerodynamic performance; Second, a pair of SJ actuators is applied on a circular cylinder to suppress the lift oscillation and hence the one-dimensional VIV; Third, the emerging WSLB concept is adopted to suppress the two-dimensional VIV of a circular cylinder, with the implementation of both open-loop and closed-loop control schemes. In addition, some underlying physics associated with SJ-related flow phenomena will be revealed through various experiments and simulations.


主办:研究生院

承办:力学与工程学院

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