报告人：Guang Hong （Associate Professor，Program Head of the Mechanical & Mechatronic Engineering Program at the University of Technology, Sydney (UTS)）

时间：2008年7月1日（周一）下午16：00

地点：流体力学楼学术报告厅（C12-619）

主办单位：国际合作交流处、科协、航空宇航学院

报告人简介：

Guang Hong received her Undergraduate and Master of Engineering degrees from the Huazhong University of Science and Technology (HUST) in Wuhan, China, and her PhD from the Cambridge University, U.K. All her degrees were in Diesel engine area. She started her research on boundary layer transition in 1990 and has developed great interest in synthetic jet actuators since 1997. She is currently an Associate Professor and Program Head of the Mechanical & Mechatronic Engineering Program at the University of Technology, Sydney (UTS). Her recent research has focused on developing synthetic jet actuators for active flow control and emission reduction of internal combustion engines. Guang is member of Society of Automotive Engineers (U.S. based), member of American Society of Mechanical Engineers, and Fellow of Society of Automotive Engineers Australasia.

报告内容简介：

A synthetic jet, originated from the idea of acoustic streaming [Ming et al 1991], has been known as a zero-net-mass but non-zero momentum fluid flux generated by a device such as a piezo-oscillator. Synthetic jet actuator (SJA) has emerged as a versatile actuator with potential applications ranging from separation and turbulence control to thrust vectoring, and augmentation of heat transfer and mixing. A unique feature of synthetic jets is that they are formed entirely from the working fluid of baseline flow without requirement of additional mass supply.

To develop an effective and efficient synthetic jet actuator, issues such as compactness, weight and power density need to be addressed. To address these issues requires understanding of the physics in the synthetic jet’s actuating process. This understanding will also be needed for developing the control strategies. One way to do this is to use the instability of the baseline flow to enhance the actuation which is decided by the controller [Seifert 2002, Hong 2006]. In the case of controlling laminar separation using SJAs, the actuation is to use the synthetic jet to trigger the flow instability. The triggered instability may be originally weak but can be enhanced by the instability of the baseline flow, until it becomes substantially strong and effective to meet the control purpose. This talk aims to disseminate the above idea.

    The research work on SJA at UTS has focused on developing a micro SJA for boundary layer separation control by understanding the fluid mechanics associated with the above idea. Both experimental and numerical methods have been applied and will be reported in the seminar.