Results 261 to 270 of about 93,869 (311)

Stress analysis of axial flow cooling fans

The Journal of Strain Analysis for Engineering Design, 1982
Tests on automobile radiator cooling fans of three types of construction pressed out from sheets are reported. The blades of the fans are treated as twisted (from tip to root) cantilever beams (fixed at root) for the purpose of analysis. The effects of centrifugal force, driving torque, and the axial thrust over the blade due to air flow are taken ...
V Ramamurti, T Shanmugavel
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Designing Axial Flow Fan for Flow and Noise

SAE Technical Paper Series, 1999
<div class="htmlview paragraph">A comprehensive finite element methodology is developed to predict the compressible flow performance of a non-symmetric 7-blade axial flow fan, and to quantify the source strength and sound pressure levels at any location in the system.
Subrata Roy, Phillip Cho, Fred Périé
openaire   +1 more source

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
openaire   +1 more source

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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Active control of axial-flow fan noise

The Journal of the Acoustical Society of America, 1995
An investigation was conducted using active noise control to reduce noise from small axial-flow fan units commonly found in computers and printers. The fan unit itself was used as the cancellation source in the active noise control scheme, achieved by axially modulating the unit with a shaker.
Gerald C. Lauchle, John R. MacGillivray, David C. Swanson   +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
openaire   +1 more source

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
openaire   +1 more source

Prediction of Axial Flow Fan Noise Spectrum

Noise Control and Acoustics: Volume 1 — Active Noise and Vibration Control; Complexity in Acoustics; Noise Sources in Internal Combustion Engines; Vehicle Flow/Structure Noises; Aeroacoustic Sound Propagation in Ducts and Jets; Turbomachinery Noise; BS/MS Student Paper Competition, 1996
Abstract This paper presents a semi-empirical formula for predicting the noise spectra of axial flow fans in a free field. The basic assumption made in deriving this formula is that sound radiation from an axial flow fan in a free field is primarily due to the fluctuating pressure exerted on the fan blade surface.
Shigong Su, Sean F. Wu, Hemant Shah
openaire   +1 more source

Exit Flow Field and Performance of Axial Flow Fans

Journal of Fluids Engineering, 2005
Flow fields near the exit and the global performance parameters of the various types of axial flow fans are studied with Particle Image Velocimetry and a standard AMCA 210 flow bench. The fans used in this study included the shrouded, shroudless, and winglet-blade types. The velocity vectors, streamlines, vorticity contours, velocity distributions, and
S. C. Yen, Frank K. T. Lin
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Characteristics of Axial Flow Fan with Diagonal Flow Hub

SAE Technical Paper Series, 1990
<div class="htmlview paragraph">For the combination of radiator and fan working under high flow resistance of radiator system, “the Axial Flow Fan with Diagonal Flow Hub” has been developed.</div> <div class="htmlview paragraph">A study of the useful ranges of the cone angle of diagonal hub and depth of fan, two dimensionless shape ...
Tadashi Mizuno, Koichiro Kikuchi
openaire   +1 more source