@article {Bianchi:2012:0736-2501:519,
title = "Installed acoustic performance of cooling axial fans fitted with end-plates",
journal = "Noise Control Engineering Journal",
parent_itemid = "infobike://ince/ncej",
publishercode ="ince",
year = "2012",
volume = "60",
number = "5",
publication date ="2012-01-10T00:00:00",
pages = "519-527",
itemtype = "ARTICLE",
issn = "0736-2501",
url = "https://ince.publisher.ingentaconnect.com/content/ince/ncej/2012/00000060/00000005/art00003",
doi = "doi:10.3397/1.3701029",
keyword = "11/4/1, 51/6",
author = "Bianchi, Stefano and Corsini, Alexxandro and Sheard, Anthony G.",
abstract = "In this study, the airborne noise generated by an axial fan installed in a draft-cooled unit is studied. The fan is tested without, and with three different blade-tip end-plates. The standard end-plate geometric has a constant thickness (TF) while the others two end-plates (TFvte and
TFmvb) are designed to deliber\textlnotately control the swirl level of the blade tip leakage vortex. Results have proven that these end-plates reduce the tip-leakage flow and vortex formation, which in turn has a favourable impact on the axial fan noise signature in standardised airways. This
study uses both free-field standardised airways, and to reproduce installation effects an induced draft configuration over a set of tube banks to distort the axial fan inflow. The paper discusses far-field noise measurements in terms of spectral analysis and directivity for the different end-plate
configurations. Although installation effects alter the noise signature of the tested rotors, the TFmvb end-plate design outperforms the other rotors, as a conse\textlnotquence of the high control of the tip flow, resulting also in lower harmonic tones.",
}