Results 21 to 30 of about 404,526 (210)
Utjecaj radijalnog i aksijalnog razrmaka na emitiranu buku i performance ventilatora
Promet (Zagreb), 2012 Among all auxilimy units of the air cooled diesel engine acooling fan is the noisiest. One of the noise generation mechanismsis the blade interaction with the vortices occurring in theradial and axial clearances of the fan due to the pressure ...
Mirko Čudina
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Acoustics, 2020 A benchmark of Reynolds-Averaged Navier-Stokes (RANS)-informed analytical methods, which are attractive for predicting fan broadband noise, was conducted within the framework of the European project TurboNoiseBB.
Carolin Kissner +11 more
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Fan Noise Reduction: An Overview [PDF]
International Journal of Aeroacoustics, 2001 Fan noise reduction technologies developed as part of the Advanced Subsonic Technology Program are reviewed. Developments in low-noise fan stage design, swept and leaned outlet guide vanes, active noise control, fan wake management, and scarf inlets are discussed.
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Application of Wake Characteristics to Prediction of Broadband Noise of a Multiblade Fan
Journal of Fluid Science and Technology, 2008 In this study, the wake characteristics of an arc blade were measured by the wind tunnel experiment; the characteristics were defined as the width of the wake, diameter of the vortex, ratio of the vortex scale, and the local lift.
Soichi SASAKI, Hidechito HAYASHI
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Optimizing Circular Side-Resonators to Reduce Computer Fan Noise [PDF]
, 2004 One of the main noise sources in computers are the cooling fans. Tonal noise at the rotational frequency of the fan, the blade passing frequency (BPF) and its higher harmonics are important in fan noise. So called 'side-resonators' integrated in the duct
Beltman, Willem M., Nijhof, Marten J.J.
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Aerodynamic noise characteristics of a centrifugal fan in high-altitude environments.
PLoS ONEIn high-altitude areas, the air is thin and the atmospheric pressure is low, which can affect the performance of centrifugal fans and aerodynamic noise.
Xue Liu, Jian Liu
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Impact of the turbulence modeling approach on the accuracy of the fan noise level prediction
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2018 The fan is the dominant source of noise for modern high bypass ratio aircraft engines. The article presents the results of investigating the influence of the approach to modeling the turbulence in modeling fan stage noise generation on the results of ...
K. R. Pyatunin, N. V. Arkharova
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Applied Sciences, 2020 Low-speed axial cooling fans are frequently used to manage engine temperature by ensuring that adequate quantities of air pass through heat exchangers, even at low vehicle speeds or in the idle condition. This study aims to provide a better understanding
Jang-oh Mo, Jae-hyuk Choi
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Noise-Source Identification for Ducted Fan Systems [PDF]
AIAA Journal, 2007 Coherence-based source analysis techniques can be used to identify the contribution of combustion noise in the exhaust of a jet engine and to hence enable the design of noise-reduction devices. However, when the combustion noise propagates in a nonlinear fashion, the identified contribution using ordinary coherence methods will be inaccurate.
BENNETT, GARETH, FITZPATRICK, JOHN AIDAN
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Measurement + Control, 2019 This work presents an experimental study to investigate the influence of step volute tongue on aerodynamic performance and aeroacoustic behavior of a forward-curved fan.
Hui Yang +7 more
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