Results 241 to 250 of about 50,603 (296)
Some of the next articles are maybe not open access.
Numerical calculation of centrifugal fan noise
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2006A numerical study on the aerodynamic noise generation of an industrial centrifugal fan with forward swept blades is carried out. Three-dimensional numerical simulations of the complete unsteady flowfield in the whole impeller — volute configuration are performed to obtain the aerodynamic sound sources.
Q Liu, D Qi, Y Mao
openaire +3 more sources
The Journal of the Acoustical Society of America, 1990
A fan is disclosed that contains cut-outs that reduce the noise levels. The fan is used to cool circuit boards.
openaire +1 more source
A fan is disclosed that contains cut-outs that reduce the noise levels. The fan is used to cool circuit boards.
openaire +1 more source
The Journal of the Acoustical Society of America, 1955
Extensions of earlier studies [J. Acoust. Soc. Am. 26, No. 2(1953)] on ventilation system noise are reported. It is shown here that in properly engineered ventilation systems the over-all sound power level in decibels re 1013a watt is related to the horsepower rating of the fan motor by the formula: PWL = 100+10 1og10hp.
Leo L. Beranek +2 more
openaire +1 more source
Extensions of earlier studies [J. Acoust. Soc. Am. 26, No. 2(1953)] on ventilation system noise are reported. It is shown here that in properly engineered ventilation systems the over-all sound power level in decibels re 1013a watt is related to the horsepower rating of the fan motor by the formula: PWL = 100+10 1og10hp.
Leo L. Beranek +2 more
openaire +1 more source
Acoustic optimization for centrifugal fans
Noise Control Engineering Journal, 2012The aim of this study is to perform a multi-objective optimization in order to reduce the noise level of a centrifugal fan in early design stages. The main goal is to minimize the flow-induced noise while providing the required pressure rise at the operating flow rate. The design procedure begins with a baseline fan.
Esra Sorguven, Yilmaz Dogan
openaire +1 more source
The Journal of the Acoustical Society of America, 1956
Early studies [J. Acoust. Soc. Am. 25, 313 (1953); J. Acoust. Soc. Am. 25, 322 (1953)] related noise output to fan horsepower and indicated the usefulness of this relation in predicting noise in ventilating systems. More comprehensive measurements yielded a simpler, more accurate equation relating noise and rated horsepower for large centrifugal fans ...
openaire +1 more source
Early studies [J. Acoust. Soc. Am. 25, 313 (1953); J. Acoust. Soc. Am. 25, 322 (1953)] related noise output to fan horsepower and indicated the usefulness of this relation in predicting noise in ventilating systems. More comprehensive measurements yielded a simpler, more accurate equation relating noise and rated horsepower for large centrifugal fans ...
openaire +1 more source
Unstable Flow in Centrifugal Fans
Journal of Fluids Engineering, 1996Rotating stall and the inlet vortex in centrifugal fans with inlet vane control has been studied. The advances in stall research in aero-engine compressors are discussed. The present study shows that stall in centrifugal fans can be quite different from that in axial compressors, in that stall can occur in a progressive and intermittent fashion.
P. Chen +3 more
openaire +1 more source
Stresses in Centrifugal Fan Impellers
Proceedings of the Institution of Mechanical Engineers, 1973The conventional, theoretical method for estimating impeller stresses combined with large factors of safety is unsatisfactory for the design of the high-pressure fans being demanded today. For economic design, a more precise knowledge of the stresses involved in high-speed impellers is essential and this has been made possible by the considerable ...
openaire +1 more source
Blade for centrifugal flow fan
The Journal of the Acoustical Society of America, 1993A blade (14) for a centrifugal flow fan (11) having forward curved blades. The blade has a boundary layer trip (21) on its pressure surface (14). The trip promotes the transition of the boundary layer from laminar to turbulent flow and enables the layer to remain attached to the pressure surface for a greater distance.
openaire +1 more source
Unsteady Flow in Multistage Centrifugal Fans
Volume 2, Parts A and B, 2004In order to improve the design of the multistage centrifugal fans, theoretical and experimental works were carried out in the optimization field of the unsteady 3D flows. Particular attention is given to the flows located at the rotor-stator interface. This zone is the seat of strong interactions between the moving part and the fixed part.
Sofiane Khelladi +3 more
openaire +1 more source
Frequency analysis of centrifugal fan impellers
Journal of Sound and Vibration, 1987The geometric periodicity is utilized to determine the natural frequencies of centrifugal fan impellers. Triangular plate elements having six degrees of freedom are used [1,2] to model the impellers. Potter's scheme of solving tridiagonal block matrices is extended to the present analysis.
P. Balasubramanian, V. Ramamurti
openaire +1 more source