Potential Flow The University of Arizona（亚利桑那大学的潜在的流）.docVIP

Potential Flow 2-Dimensional Vortex Panel Model: Applications to Wingmills by John Moores A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF BACHELLOR OF APPLIED SCIENCE DIVISION OF ENGINEERING SCIENCE FACULTY OF APPLIED SCIENCE AND ENGINEERING UNIVERSITY OF TORONTO Supervisor J. D. DeLaurier April 2003 Acknowledgements The author would like to acknowledge the aid offered by the staff of the Subsonic Flight (Windtunnel) Lab at the University of Toronto Institute for Aerospace Studies 2002-2003 and by Dr. James D. DeLaurier in the production of this thesis. Of particular note is Patrick Zdunich on whose Master’s thesis much of this work is based. I remain indebted to him for the suggestions he provided to me at times of impasse. As well, the author would like to acknowledge the financial support of the Natural Sciences and Engineering Research Council in the production of this thesis. But most of all, I owe a debt of gratitude Michelle Parsons for proofreading this manuscript and for taking some of the experimental data during times when I was incapacitated with work, and without whose help, support, and extra computer this thesis would not have been possible. Abstract Using a 2-dimensional time-marching vortex panel method developed based on the approach by Zdunich and DeLaurier, applications to wingmills (oscillating airfoil power generators) are examined. In particular, the method of Zdunich is extended to airfoils of finite thickness. Furthermore, it is determined that the attached flow portion of the model while not useful for predicting the air wingmill of McKinney and DeLaurier, may have applications in other media or at smaller pitching amplitudes for which flow separation and airfoil stall are not at issue. As such, a theoretical basis for the extension of the model to account for variable camber in order to maximize the energy extraction at lower pitching amplitudes and frequencies is determined. TABLE OF CONTENTS Notation……