Rotary kinetic fluid motors or pumps – With separating means or guard for solid matter in working...
Reexamination Certificate
2005-03-15
2005-03-15
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
With separating means or guard for solid matter in working...
C415S191000, C415S208200, C415S914000, C416S24700A
Reexamination Certificate
active
06866474
ABSTRACT:
Acoustic vibrations generated by von Karman vortex streets are reduced by shaping members interposed in moving air flowstreams, such as fan guards and grilles used in forced flow air conditioning systems, to have either a cylindrical cross section or a non-cylindrical cross-section with non-linear or interrupted leading or trailing edges presented to the air flowstream. Relatively flat rectangular cross-section members with interrupted or non-linear leading or trailing edges formed by somewhat sawtooth or sinusoidal wave forms or connected to spaced apart support members, or cylindrical members formed in the shape of a sawtooth or sinusoidal wave form, or presented with spaced apart rings or grooves interrupting the cylindrical cross-section of the member are typical configurations which exhibit reduced or substantially eliminated acoustic vibrations caused by von Karman vortex shedding.
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Owen, J. C., Bearman, P. W., Passive Control of VIV With Drag Reduction, Journal of Fluids and Structures (2002) pp. 597-605; vol. 15, Department of Aeronautics, Imperial College of Science, Technology and Medicine, London SW7, 2BY, U.K.
Gardere Wynne & Sewell LLP
Kershteyn Igor
Lennox Industries Inc.
Look Edward K.
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