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Study of Aeroacoustic Phenomenons at ducted Cooling Fans

Lohmann, D. (2000) Study of Aeroacoustic Phenomenons at ducted Cooling Fans. In: Internoise Congress. Internoise Congress, Nizza (fr), 28.-30.08.2000.

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Abstract

Germany's vehicle industry is greatly concerned with advancing their engines to make them environmentally compatible. This often leads to higher temperatures which have to be reduced by improved fans. However, less experience exists for high efficient fans of large diameters and power as used for trucks and busses. Therefore, two ducted full-scale fan models have been investigated to reduce noise and energy losses. Aerodynamic design parameters were planformm blade number, hub to tip ratio and the size of the slit. the experiments were conducted with a sucking wind tunnel and afterwards with the bus. The first model fan was designed such that the temperature is reduced by 3 degree and the noise by 1.3 dB(A) when mounted inside the bus. However, more than 6 dB(A) less noise was obtained with a second model due to an improved airfoil and a special localization inside the duct. The results indicate some important guidelines for the optimization of fans in the future.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2000, monograph_id=IN2000/0175,
Title:Study of Aeroacoustic Phenomenons at ducted Cooling Fans
Authors:
AuthorsInstitution or Email of Authors
Lohmann, D.UNSPECIFIED
Date:2000
Journal or Publication Title:Internoise Congress
Status:Published
Event Title:Internoise Congress, Nizza (fr), 28.-30.08.2000
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):L - Concepts & Integration
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: Claudia Grant
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:12

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