Results 131 to 140 of about 522 (180)
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Numerical Prediction of Tonal Noise in Centrifugal Blowers
Volume 1: Aircraft Engine; Fans and Blowers; Marine, 2018Centrifugal blowers are widely used in automotive, heating, ventilating, air-conditioning and other industrial purposes. In fact, they allow high-pressure increase to a moderately high mass flow rate, despite the reduced overall dimensions of the system.
Cravero C., Marsano D.
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Prediction and reduction of centrifugal blower noises
The Journal of the Acoustical Society of America, 1998This paper presents the results of an investigation of centrifugal blower noises. Experiments on three different types of blowers were conducted to determine the major noise generation mechanisms. The information thus gained has led to an innovative noise reduction method utilizing a stationary, noncontacting transition mesh. Experiments showed that an
Christopher L. Banks, Sean F. Wu
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The use of resonators to silence centrifugal blowers
Journal of Sound and Vibration, 1982Abstract The casing of a 235 mm diameter, commercially produced, centrifugal blower was modified by replacing the cut-off of the scroll with a quarter-wavelength resonator. The mouth of the resonator was formed from a perforated plate which had the same curvature as the original cut-off section.
G.H. Koopmann, W. Neise
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Velocity Measurements Downstream of the Impellers in a Multistage Centrifugal Blower
Journal of Turbomachinery, 1994The paper presents the results of an experimental investigation on a four-stage centrifugal blower, having the aim of obtaining an accurate description of the flow field behind the impellers in several operative conditions and for different geometric configurations.
ARNULFI, Gianmario +2 more
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Failure Analysis of a Large Centrifugal Blower
2019Abstract A fracture mechanics based failure analysis and life prediction of a large centrifugal fan made from low-carbon, medium-strength steel was undertaken following shortcomings in attempts to explain its fatigue life from start stop cycles alone.
R.B. Tait, G.G. Garrett, D.P. Spencer
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The Journal of the Acoustical Society of America, 1996
The present invention provides a centrifugal blower wherein the noise at the cutoff has been substantially reduced by providing a vortex in the air flow near the cutoff to redirect the air flow. A fin projects downwardly into the space created by the exhaust outlet to redirect the air flow away from the cutoff and create a vortex to quiet the air flow.
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The present invention provides a centrifugal blower wherein the noise at the cutoff has been substantially reduced by providing a vortex in the air flow near the cutoff to redirect the air flow. A fin projects downwardly into the space created by the exhaust outlet to redirect the air flow away from the cutoff and create a vortex to quiet the air flow.
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Small Two-Stage Centrifugal Blowers
Fluids Engineering, 2005We surveyed small two-stage centrifugal blowers, specifically their static parts and silencers. One of their features was a simple diffuser without a division plate between two centrifugal impellers instead of the normal return channel. Variety chord return vanes that gradually shorten along airflow passes are efficient for our characteristic diffuser ...
Shigehisa Funabashi +5 more
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Design, Development and Analysis of Centrifugal Blower
Journal of The Institution of Engineers (India): Series C, 2017Centrifugal blowers are widely used turbomachines equipment in all kinds of modern and domestic life. Manufacturing of blowers seldom follow an optimum design solution for individual blower. Although centrifugal blowers are developed as highly efficient machines, design is still based on various empirical and semi empirical rules proposed by fan ...
Beena Devendra Baloni +2 more
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Method of sound attenuation in centrifugal blowers
The Journal of the Acoustical Society of America, 2003A centrifugal blower housing that includes sound attenuating features to decrease the noise generated by the pressure fluctuations due to blade pass. The blower housing includes at least one sound attenuating cavity positioned along the exhaust section integrally formed as part of the blower housing. The sound cavity creates a sound dampening zone near
Leslie A. Lyons, David A. Fisher
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Dissimilarity Laws in Centrifugal Pumps and Blowers
Journal of Engineering for Power, 1961Two kinds of dissimilarities are discussed: (a) Planned dissimilarities between the different hydraulic types as expressed by the performance specific speed; (b) deviation from geometrical similarity which is “forced” to accommodate some special condition at the same performance specific speed.
A. J. Stepanoff, H. A. Stahl
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