Results 51 to 60 of about 34,876 (162)

Computational investigation of aerodynamic and acoustic characteristics of an ultrahigh-bypass ratio counter-rotating fan

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2018
A computational investigation of aerodynamic characteristics of a model ultrahigh-bypass ratio counter-rotating fan (m=20) developed at CIAM within the framework of the European Project COBRA (Innovative Counter Rotating Fan System for High Bypass Ratio ...
Ya. M. Druzhinin, V. I. Mileshin, A. A. Rossikhin   +2 more
doaj   +1 more source

Numerical and Experimental Investigations of the Sound Generation and Possible Optimization Techniques of Wires for Fan Guard Grilles

International Journal of Turbomachinery, Propulsion and Power
For modern axial fans optimized for low self-noise, additional noise emission from guard grilles mounted downstream of the fan can become one of the dominant sources of sound.
Sandra Hub, Frieder Lörcher
doaj   +1 more source

Noise Source of a Multiblade Fan.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, 1991
A search was attempted for the noise source of a multiblade fan by measuring the acoustic intensity using a sound transmittable scroll, and by investigating the state of flow in detail by measuring three-dimensional flow and turbulence at the outlet of an impeller with the aid of a small-sized hot wire probe.
openaire   +2 more sources

Efficiency of tandem UAV propulsion fans with toroidal-helical connected blade tips

Авіаційно-космічна техніка та технологія
Unmanned Aerial Vehicles (UAVs) are increasingly in demand for both civilian and military missions. This has become especially evident during combat operations against the Russian Federation’s occupying forces, where battlefield advantages have been ...
Mykola Kulyk, Fedir Kirchu, Larysa Volianska, Ivan Babichev   +3 more
doaj   +1 more source

Calculation of Total Tone-to-Noise Ratio and Total Prominence Ratio for Small Fan Noise and Determination of Subjective Annoyance Thresholds

International Journal of Turbomachinery, Propulsion and Power
Fan noise from small cooling fans often contains multiple coexisting tonal components whose combined perceptual impact cannot be fully represented by conventional single-tone metrics.
Takefumi Nakano, Gaku Minorikawa
doaj   +1 more source

Low Noise Optimization of Automotive Air Conditioning Based on Response Surface Methodology

Archives of Acoustics
Air conditioning is an important contributor to in-vehicle noise. In order to achieve low noise optimization, investigations were performed in a typical air conditioning unit. Computational Fluid Dynamics and Computational Aeroacoustics were combined to
Cheng Qian, Daqian Wang, Hao Wang, Fushen Tang, Min Lin, Jinjin Xu   +5 more
doaj   +1 more source

Experimental and Numerical Investigation of a 60cm Diameter Bladeless Fan

Journal of Applied Fluid Mechanics, 2016
Bladeless fan is a novel type of fan with an unusual geometry and unique characteristics. This type of fan has been recently developed for domestic applications in sizes typically up to 30cm diameter.
mohammad jafari, Hossein Afshin, Bijan Farhanieh, Hamidreza bozorgasareh   +3 more
doaj  

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Aerospace
In this paper, a numerical investigation is performed to study the broadband noise of a fan stage with wavy trailing-edge blades. A study of the wavelength and ratio of amplitude to wavelength (H/L) is conducted to better understand the noise reduction ...
Ruibiao Gao, Weijie Chen, Hang Tong, Jianxin Lian, Weiyang Qiao   +4 more
doaj   +1 more source

Fan Noise

Acta Acustica united with Acustica, 2019
openaire   +1 more source

Effects of Fan Noise on Growth Performance, Blood Parameters, Feeding Behavior, and Slaughter Performance of Geese Aged 21-70 Days. [PDF]

Animals (Basel)
Xie Q, Huang X, Liu Z, Chen Y, He Y, Chang X, Cheng Q, Gao G, Luo Y, Wang H, Wang Q, Xue J, Wang C.   +12 more
europepmc   +1 more source