Abstract
An Acoustic Camera was applied to examine modifications of fan blade designs regarding their noise emissions. A so-called rotational beamforming algorithm allows for the detection of sound sources on the rotating blades by using a virtual rotation of the microphones. Depending upon the frequency different sources could be localized. Both the leading and the trailing edge were modified. This paper shows the performed modifications and tests with the Acoustic Camera. It also presents first results and gives an outlook on future work.
Highlights
Axial blowing fans are commonly known in many fields of applications
A so-called rotational beamforming algorithm allows for the detection of sound sources on the rotating blades by using a virtual rotation of the microphones
This paper shows the performed modifications and tests with the Acoustic Camera
Summary
Swirls occur at the trailing edge of the blades due to the working principle. These swirls are unwanted in most cases and may have unfavourable influence on subsequent devices, e.g. higher pressure drop or lower heat transfer coefficient. Beside the high power density and the high efficiency it should be noted that these fans are known for problematic noise behaviour. This is induced by the interaction of both wheels with different directions of rotation. Different sources could be localised [1] Both the leading and the trailing edge were modified. It presents first results and gives an outlook on future work and usage
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