Results 81 to 90 of about 404,526 (210)

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

A compact inflow control device for simulating flight fan noise [PDF]

Inflow control device (ICD's) of various shapes and sizes have been used to simulate inflight fan tone noise during ground static tests. A small, simple inexpensive ICD design was optimized from previous design and fabrication techniques.
Heidelberg, L. J., Homyak, L., Mcardle, J. G.   +2 more
core   +1 more source

Electronics Cooling Fan Noise Prediction [PDF]

, 2006
Using the finite volume CFD software FLUENT, one fan was studied at a given flow rate (1.5m3/min) for three different operational rotating speeds : 2,000, 2,350 and 2,700 rpm. The turbulent air flow analysis predicts the acoustic behavior of the fan. The
Dozolme, A., Marchal, T., Metwally, H.
core   +1 more source

Evaluating the Aerodynamic Impact of Circumferentially Grooved Fan Casing Treatments with Integrated Acoustic Liners on a Turbofan Rotor [PDF]

NASA is investigating the potential of integrating acoustic liners into fan cases to reduce fan noise, while maintaining the fan's aerodynamic performance.
Bozak, Richard F., Podboy, Gary G.
core   +1 more source

Analysis of aerodynamic and aeroacoustic performances of axial flow fans with variable winglet curvature in chordwise direction

Results in Engineering
This study introduces a novel concept for axial-flow fans with winglets featuring gradually decreasing curvature along the chordwise direction. The objective is to mitigate the formation of leakage vortices in the gap flow region between the fan blade ...
Seo-Yoon Ryu, Cheolung Cheong, Jong Wook Kim, Byung Il Park   +3 more
doaj   +1 more source

Variation of fan tone steadiness for several inflow conditions [PDF]

An amplitude probability density function analysis technique for quantifying the degree of fan noise tone steadiness has been applied to data from a fan tested under a variety of inflow conditions.
Balombin, J. R.
core   +1 more source

Development of low-noise and large-air flow rate bionic serrated blades for multi-blade centrifugal fans in heat pump dryers

Case Studies in Thermal Engineering
A heat pump dryer usually adopts a centrifugal fan with multi-blades for generating large flow rate of air, but faces the problem of high aerodynamic noise. The application of bionic serrated blades instead of straight-edged blades in fans is a promising
Wenyi Zhou, Feilong Zhan, Ziteng Yan, Guoliang Ding, Dexi Deng, Cong Li, Jin Xiong, Zhanbo Yang   +7 more
doaj   +1 more source

Acoustic and aerodynamic performance of a 1.83-meter (6-ft) diameter 1.25-pressure-ratio fan (QF-8) [PDF]

A 1.25-pressure-ratio 1.83-meter (6-ft) tip diameter experimental fan stage with characteristics suitable for engine application on STOL aircraft was tested for acoustic and aerodynamic performance.
Lucas, J. G., Woodward, R. P.
core   +1 more source

Acoustic performance of two 1.83-meter-diameter fans designed for a wind-tunnel drive system [PDF]

A parametric study was made of the noise generated by two 1.83-m (6-ft) diameter fans operating up to a maximum pressure ratio of 1.03. One fan had 15 rotor blades, 23 stator blades, and a maximum rotational speed of 1200 rpm.
Page, V. R., Soderman, P. R.
core   +1 more source