Results 261 to 270 of about 34,518 (312)

Sources of Noise in Axial Flow Fans

The Journal of the Acoustical Society of America, 1971
Experiments and theory relating to fan noise sources are reviewed with emphasis on axial flow machines. At supersonic rotor speeds, the steady shock pattern attached to a rotor is an efficient radiator of sound. In most practical cases of subsonic rotor operation, however, direct radiation from the rotor-locked pressure field is negligible compared ...
B. D. Mugridge, C. L. Morfey
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Axial flow fan

The Journal of the Acoustical Society of America, 2010
An axial flow fan of high efficiency and low noise level is provided. The fan includes a motor, an impeller having a plurality of blades around a hub fitted to the motor, and a fan casing having an air inlet on one side and an air outlet on the other, wherein a radial position with a maximum setting angle in a blade section, and a radial position with ...
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Noise and Efficiency of Axial-Flow Fans

SAE Technical Paper Series, 1970
<div class="htmlview paragraph">A test apparatus was constructed and instrumented for testing tractor engine cooling fans in an environment simulating actual operating conditions. Tests were conducted to investigate the influence of the blade pitch angle, blade camber and fan rotational speed on the air delivery performance, the input power ...
J. W. Hummel, J. A. Weber
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Reynolds Number Scaling of Axial Flow Fans [PDF]

, 2022
There exists uncertainty about the accuracy with which the fan scaling laws can predict the performance characteristics of a full scale prototype fan from model testing. This uncertainty stems from the large difference in the value for Reynolds number that typically exists between the prototype and model fan.
Steenkamp, Gerhardus Marthinus, Meyer, Chris, Spuy, Johan van der   +2 more
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Reversing of Axial Flow Fans for Ventilation

Volume 4: Cycle Innovations; Fans and Blowers; Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Oil and Gas Applications, 2011
Changing the flow direction in fans is frequently required in emergency situations in traffic tunnels, chemical plants and mines ventilation. Reverse flow in axial flow fan is often achieved using two methods: a) Changing direction of fan rotation and turning the stator vanes (Method I).
Vaclav Cyrus, Jiri Pelnar, Jan Cyrus
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The Design and Performance of an Axial-Flow Fan

Journal of Fluids Engineering, 1934
Abstract This paper deals with the design and performance of an axial-flow fan for comparatively high pressures. The design is based largely on extensive investigations of the air flow through a fan of well-known design which yielded certain constants.
Lionel S. Marks, John R. Weske
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Visualisation of rotating stall in an axial flow fan

Experimental Thermal and Fluid Science, 2014
Abstract Visualisation of a flow field was performed within the rotor blade passage of an axial flow fan operating under rotating stall conditions. A PIV system was used to capture the velocity field at an 80% span of the rotor blade. PIV triggering was synchronized with the observed blades’ passing, and over 1000 PIV images were obtained. These were
Matej Fike, Gorazd Bombek, Matjaž Hriberšek, Aleš Hribernik   +3 more
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Noise generation in axial flow fans

Journal of Sound and Vibration, 1966
Abstract An empirical equation for fan noise is presented. The equation predicts, with fair accuracy, the noise of several fan configurations tested, yielding noise spectra over the frequency range 40 to 10,000 Hz at various fan speeds and over the measurable range of fan performance characteristics.
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Flutter of a Fan Blade in Supersonic Axial Flow

Journal of Turbomachinery, 1989
An application of a simple aeroelastic model to an advanced supersonic axial flow fan is presented. Lane’s cascade theory is used to determine the unsteady aerodynamic loads. Parametric studies are performed to determine the effects of mode coupling, Mach number, damping, pitching axis location, solidity, stagger angle, and mistuning.
R. E. Kielb, J. K. Ramsey
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An investigation of axial flow fan noise

Journal of Sound and Vibration, 1966
Abstract Measurements of noise from fans designed for military vehicle cooling installations have been made. Two fan rotors in particular have been run under varied test conditions. The main parameters investigated were tip speed, tip clearance, back pressure, blade stagger angle, the presence of inlet and outlet struts, and number of blades.
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