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Analytic description of the noise radiation from single- and contra-rotating propellers [PDF]

Brouwer, H.H.
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ESICM LIVES 2024. Barcelona, Spain. 5–9 October 2024. [PDF]

Intensive Care Med Exp
europepmc   +1 more source

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Multi-disciplinary optimization of a contra-rotating fan

International Journal of Aeroacoustics, 2018
This paper presents the shape optimization of the blades of a contra-rotating fan according to aerodynamic, structural and aeroacoustic criteria. The prediction of wake-interaction and trailing-edge noise emission is integrated into the optimization process by means of RANS-based hybrid methods.
Gabriele Grasso, Stéphane Moreau, Julien Christophe, Christophe Schram   +3 more
openaire   +3 more sources

Unsteady flow condition of contra-rotating small-sized axial fan

Journal of Thermal Science, 2011
Small-sized axial fans are used as air cooler for electric equipments. But there is a strong demand for higher power of fans according to the increase of quantity of heat from electric devices. Therefore, higher rotational speed design is conducted, although, it causes the deterioration of efficiency and the increase of noise.
T. Shigemitsu, J. Fukutomi, Y. Okabe, K. Iuchi, H. Shimizu   +4 more
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Performance and internal flow of sirocco fan using contra-rotating rotors

Journal of Thermal Science, 2008
A sirocco fan using contra-rotating rotors in which an inner rotor is settled inside the sirocco fan rotor and each rotor rotates in an opposite direction was proposed for the purpose of getting the higher pressure and making the structure of a sirocco fan more compact. If the high discharge pressure is obtained with the adoption of the contra-rotating
J. Fukutomi, T. Shigemitsu, T. Yasunobu
openaire   +3 more sources