Large Amplitude Pneumatic Oscillator Kim, Byung-hun 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. Sponsorship: Illinois Institute of Technology United States Patent 2009-05-14 2002-05-21 Patent application/pdf islandora:9786 6,390,116 http://hdl.handle.net/10560/2435 en No Copyright - United States http://rightsstatements.org/page/NoC-US/1.0/ Open Access