Feedback control of boundary layer bypass transition: experimental and numerical progress
2009 (English)In: 47th AIAA Aerospace Sciences Meeting, Orlando, FL, American Institute of Aeronautics and Astronautics , 2009Conference paper (Refereed)
Experimental and numerical work at the Linné FLOW Centre on active control of transition induced by free-stream turbulence is reviewed and two extensions to previous work are reported. Previously, an experimental setup with upstream sensors and downstream actuators has been built. It has been demonstrated that an
ad-hoc control algorithm is able to give a considerable attenuation of the disturbance amplitude downstream of the ac- tuators. Furthermore, large-eddy simulations (LES) of optimal feedback control have been performed for a similar flow configuration and disturbance attenuation as well as transition delay have been obtained. Two extensions are made. First, an effort is made to match the disturbance behavior in the experimental flow case and in the LES. Control is applied in simulations of the matched system aiming at approaching the type of actuation used in the experiments (localized suction). The control law is still computed as optimal feedback of the linear system. As the actuation ability approaches the experiments (where much simpler controllers were used), so does the control effect. Second, system identification (SI) is applied to the experimental data and a more efficient controller is designed. It is made plausible that controllers designed by SI can give considerable improvements in the disturbance attenuation. Implications for future work in the area of active control are discussed.
Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics , 2009.
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-10647ScopusID: 2-s2.0-78549262075OAI: oai:DiVA.org:kth-10647DiVA: diva2:222639
47th AIAA Aerospace Sciences Meeting Including The New Horizons Forum and Aerospace Exposition, 5 - 8 January 2009, Orlando, Florida
QC 201010202009-06-092009-06-092010-10-20Bibliographically approved