PatentDOI
Quiet fan with non-radial elements
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TLDR
In this article, a series of rotating vanes, stationary vanes or supporting structure of streamline struts is oriented in circumferentially leaning relation to another series of blades in the machine to effect a reduction in noise.Abstract:
In an air blower or axial compressor, such as employed in airplane power plants, ventilating systems, etc, a series of rotating vanes, stationary vanes, or supporting structure of streamline struts is oriented in circumferentially leaning relation to another series of blades in the machine so as to effect a reduction in noiseread more
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Rotatable turbine frame
John J. Green Valley Country Club Apts. Ciokajlo,Ambrose Andreas Hauser,Samuel Henry Davison +2 more
TL;DR: A rotatable turbine frame (48,50) includes annular outer and inner bands (48b,50b) having a plurality of circumferentially spaced apart struts (48a,50a) extending therebetween as discussed by the authors.
PatentDOI
Low noise fan assembly
TL;DR: In this article, the number of vanes is selected for a predetermined number of blades for obtaining substantially equal values of a cut-off ratio for at least two blade passing frequency harmonics for reducing spinning mode noise from the duct.
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Fan guard structure for additional supercharging function
TL;DR: In this article, a fan guard is used to supercharge a fan in addition to supporting a rotor device, and the fan guard interacts with an airflow generated by the revolution of the rotor blades to super charge the fan.
Patent
Curved blade turbomachinery noise reduction
Stephen B. Kazin,Ram Kumar Matta +1 more
TL;DR: In this article, a turbomachinery stage comprising two axially spaced blade rows, one of which is rotatable, is considered, where the blades of the upstream row are contoured to present a leaned wake to the downstream row.
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Axial-flow fan
TL;DR: In this paper, an axial flow fan characterized by fan blades provided at the upper stream of actuator blades is shown to be inclined at a certain angle in the peripheral direction to a plane including the shaft axis.
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Guiding vane for fans or the like
TL;DR: In this paper, the design of the guiding vanes utilized in devices of this type, which may comprise one or more pressure stages, has been discussed, with the main object being to provide the vanes such that more silent operation is obtained.