creator Kim, Byung-hun creator Williams, David R. A system for producing variable amplitude pneumatic pulses, such as may be used to prevent flow separation on airfoil and diffuser surfaces to control stalling, utilizes a source of pressurized air which is regulated and fed to parallel outlet lines. Each outlet line has a control valve therein attached to a controller for activation of the valves. The first parallel line leads to an actuator which supplies the pulsed air to a desired surface. The second parallel line leads to the atmosphere. By cycling the valves at about ninety degrees out of phase, pneumatic pulses of large amplitude are obtained with a simple device capable of being transported on the aircraft. Submitted by Aric Ahrens (ahrens@iit.edu) on 2012-01-12T19:04:36Z No. of bitstreams: 1 6390116.pdf: 60670 bytes, checksum: bb08b46080887794e15c20a90507864e (MD5) Made available in DSpace on 2012-01-12T19:04:36Z (GMT). No. of bitstreams: 1 6390116.pdf: 60670 bytes, checksum: bb08b46080887794e15c20a90507864e (MD5) Previous issue date: 2002-05-21 Illinois Institute of Technology 2009-05-14 2002-05-21 6,390,116 http://hdl.handle.net/10560/2435 en United States Patent Patent reformatted digital application/pdf No Copyright - United States http://rightsstatements.org/page/NoC-US/1.0/ Open Access