Method and apparatus for controlled modification of fluid flow

US5040560A · kind A · utility

Inventors

• Ari Glezer · Atlanta, US
• Kris J. Nygaard · Glendale, US
• John Wiltse · Lake Oswego, US

Key dates

• Filing date: Dec 5, 1990
• Grant date: Aug 20, 1991
• Expiry date: Dec 5, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/2213
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

Substantial alteration of the flow conditions in a fluid stream are effected by the application of controlled disturbances to the boundary of or within the stream by one or more piezoelectric actuators. The actuators have resonance frequencies substantially in excess of the unstable frequencies of the stream. The actuators are energized by carrier signals at the resonance frequencies of the actuators, which carrier signals have been modulated at the desired unstable frequency of the stream.