Title page for ETD etd-10222004-132351


Type of Document Master's Thesis
Author Rullan, Jose M
URN etd-10222004-132351
Title Flow Control Over a Circular Arc Airfoil by Periodic Blowing
Degree Master of Science
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Telionis, Demetri P. Committee Chair
Ragab, Saad A. Committee Member
Vlachos, Pavlos P. Committee Member
Keywords
  • vortex formation
  • jet pulsation
  • separated flow
  • flow control
  • Sharp edge airfoil
Date of Defense 2004-05-11
Availability unrestricted
Abstract
The flow over sharp-edged wings is almost always separated. The control of separated flows is possible and benefits can be achieved but only in a time average sense. A new design of an actuator was designed and tested which can achieve a wide range velocity of without frequency dependence, is free of oscillating components as well as free of secondary frequencies and therefore can be scaled up easily, unlike a traditional synthetic jet. The actuator can achieve a considerable amount of jet vectoring, thus aligning the disturbance with the leading edge shear layer.

Results indicate that unsteady mini-jet actuation is an effective actuation device capable of increasing the lift in the stall region of the airfoil. Moreover, pressure measurements showed that two parameters could be altered to maximize the lift. The momentum coefficient needed a minimum value to exert influence and the actuating frequency need not be at exact the natural shedding frequency to improve the lift and can be operated at harmonics of the natural shedding frequency and obtain improvements.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  2500s25z.avi 13.44 Mb 01:02:12 00:31:59 00:27:59 00:13:59 00:01:11
  2511s25z.avi 17.04 Mb 01:18:54 00:40:34 00:35:30 00:17:45 00:01:30
  thesis_Jose_Rullan.pdf 9.08 Mb 00:42:03 00:21:37 00:18:55 00:09:27 00:00:48

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.