Experimental noise reduction (aeroacoustical enhancement) of a large diameter axial flow cooling fan through a reduction in blade tip clearance

IF 1.2 4区工程技术 Q3 ACOUSTICS International Journal of Aeroacoustics Pub Date : 2023-06-01 DOI:10.1177/1475472X231183156

Pieter Coenraad Swanepoel, T. Biedermann, S. J. van der Spuy

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引用次数: 1

Abstract

Aerodynamic and aeroacoustic performance experiments were carried out on four- and eight bladed, 1.542 m diameter, axial flow cooling fans, with constant solidity and hub-to-tip ratio. Tests were conducted in an ISO5801, Type A Fan Test facility. The tip gap (TG) was reduced from 4 mm (0.26% fan diameter) to 2 mm (0.13% fan diameter), to 0 mm, for both fan configurations. The noise profile of each fan configuration at the same TG over the whole volumetric flow rate spectrum was compared to each other. The 4 mm (0.26%) TG is used as a baseline to measure the nett increase or decrease in sound levels. Noise emissions decreased as the TG was reduced. It is discovered that the four bladed fan configuration had lower noise emissions than the eight bladed fan configuration at all blade tip clearances at design flow rate. It is concluded that reducing the TG and number of blades, at constant solidity, reduces sound emissions. The 0 mm TG for the four bladed fan produced the greatest reduction in noise emissions. An increase in fan total-to-static performance is observed when reducing the TG for both fan configurations.

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通过减小叶尖间隙对大直径轴流冷却风扇降噪(气动增强)的实验研究

采用四叶和八叶、直径1.542 m的轴流冷却风扇，在定固体度和轴尖比条件下进行了气动和气动声学性能实验。测试在ISO5801 A型风扇测试设施中进行。两种风扇配置的叶尖间隙(TG)都从4mm(0.26%风扇直径)减小到2mm(0.13%风扇直径)，再减小到0 mm。在相同的热重下，在整个体积流量谱上，对每种风扇配置的噪声分布进行了比较。4mm (0.26%) TG被用作测量声级净增加或减少的基线。随着TG的降低，噪声排放也随之降低。研究发现，在设计流量下，在所有叶尖间隙下，四叶风扇结构的噪声排放比八叶风扇结构的噪声排放低。在一定的固体度下，减少热重和叶片数量可以减少声发射。4叶片风扇的0毫米TG产生了最大的噪音排放减少。当降低两种风扇配置的TG时，可以观察到风扇总静态性能的增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Aeroacoustics ACOUSTICS-ENGINEERING, AEROSPACE

CiteScore

2.10

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： International Journal of Aeroacoustics is a peer-reviewed journal publishing developments in all areas of fundamental and applied aeroacoustics. Fundamental topics include advances in understanding aeroacoustics phenomena; applied topics include all aspects of civil and military aircraft, automobile and high speed train aeroacoustics, and the impact of acoustics on structures. As well as original contributions, state of the art reviews and surveys will be published. Subtopics include, among others, jet mixing noise; screech tones; broadband shock associated noise and methods for suppression; the near-ground acoustic environment of Short Take-Off and Vertical Landing (STOVL) aircraft; weapons bay aeroacoustics, cavity acoustics, closed-loop feedback control of aeroacoustic phenomena; computational aeroacoustics including high fidelity numerical simulations, and analytical acoustics.