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research-article

Aeroacoustic Analysis of Low-Speed Axial Fans with Different Rotational Speeds in the Design Point

[+] Author and Article Information
Patrick Buchwald

Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgart, Stuttgart, Germany
buchwald@itsm.uni-stuttgart.de

Damian M. Vogt

Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgart, Stuttgart, Germany
damian.vogt@itsm.uni-stuttgart.de

Julien Grilliat

ebm-papst St. Georgen GmbH & Co. KG, St. Georgen, Germany
julien.grilliat@de.ebmpapst.com

Wolfgang Laufer

ebm-papst St. Georgen GmbH & Co. KG, St. Georgen, Germany
wolfgang.laufer@de.ebmpapst.com

Michael B. Schmitz

ebm-papst St. Georgen GmbH & Co. KG, St. Georgen, Germany
michael.b.schmitz@siemens.com

Andreas Lucius

ebm-papst Mulfingen GmbH & Co. KG, Mulfingen, Germany
andreas.lucius@de.ebmpapst.com

Marc Schneider

ebm-papst Mulfingen GmbH & Co. KG, Mulfingen, Germany; Siemens Switzerland Ltd
marc.schneider@de.ebmpapst.com

1Corresponding author.

ASME doi:10.1115/1.4038122 History: Received July 03, 2017; Revised August 08, 2017

Abstract

One of the main design decisions in the development of low-speed axial fans is the right choice of the blade loading versus rotational speed, since a target pressure rise could either be achieved with a slow spinning fan and high blade loading or a fast spinning fan with less flow turning in the blade passages. Both the blade loading and the fan speed have an influence on the fan performance and the fan acoustics and there is a need to find the optimum choice in order to maximize efficiency while minimizing noise emissions. The present paper addresses this problem by investigating five different fans with the same pressure rise but different rotational speeds in the design point. In the first part of the numerical study, the fan design is described and steady-state Reynolds-averaged Navier-Stokes (RANS) simulations are conducted in order to identify the performance of the fans in the design point and in off-design conditions. The investigations show the existence of an optimum in rotational speed regarding fan efficiency and identify a flow separation on the hub causing a deflection of the outflow in radial direction as the main loss source for slow spinning fans with high blade loadings. Subsequently, Large Eddy Simulations (LES) along with the acoustic analogy of Ffowcs Williams and Hawkings (FW-H) are performed in the design point to identify the main noise sources and to determine the far-field acoustics.

Copyright (c) 2017 by ASME
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