Guest Speaker: Prof. WEN Xin
School of Mechanical Engineering
Shanghai Jiao Tong University
Prof. WEN serves as professor in Shanghai Jiao Tong University, China. He obtained his bachelor and master degrees from Huazhong University of Science and Technology, then obtained PhD degree from Nanyang Technological University in Singapore in 2015. His main research fields include flow control technology and experimental measurement methods. He is particularly interested in developing aerodynamic control techniques, like fluidic thrust vector and circulation control, based on sweeping jet and synthetic jet actuators. In addition, he developed data driven methods to fuse multiple datasets from different measurement sources to facilitate the experimental study. He published more than 60 international papers, including Journal of Fluid Mechanics, Experiments in Fluids, Physics of Fluids, AIAA Journal. He is a PI for more than 10 national research projects including the National Natural Science Foundation of China, the Equipment Development Department of the National Military Commission, the Science and Technology Commission of the National Military Commission, and the Aviation/Aerospace Power Fund of China. euter, and most major newspapers in Japan, including Yomiuri-Shimbun, Asashi-Shimbun, Nihon Keizai Shimbun, Nikkan etc.
Abstract
Sweeping jet actuator is a promising active flow control technology, because it can produce high-frequency excitation without using any mechanical moving parts. However, there are still challenging problems in applications. The sweeping jet actuator has complicated internal geometry, which can cause light shadow in the particle image velocimetry (PIV) measurement. Also, the frequency of the sweeping jet can be up to several kHz, which is difficult for the optical measurement to obtain high temporal resolution. In this regard, we proposed data fusion method to reconstruct the missing data in PIV measurement. In addition, we developed a method to capture the high-temporal pressure field of the sweeping jet by fusing the pressure sensitive paint (PSP) and high-frequency pressure tapes based on compressed sensing. Based on the data-driven measurement methods, the working principles of the sweeping jets are examined in details. Then, several new designs of sweeping jet actuators are proposed to increase the sweeping frequency and control the sweeping angle, which cannot be achieved by the existing design. Several new applications of the sweeping jets are proposed and successfully demonstrated in the circulation-control wings and Ma 0.7 thrust vector control. Last, to realize an effective feedback control loop, data-driven methods are proposed for sensing and predicting the aerodynamic parameters based on only scattering sensors.
