Low-Speed Fan Noise Attenuation from a Foam-Metal Liner

被引：51

作者：

Sutliff, Daniel L. ^{[1
]}

Jones, Michael G. ^{[2
]}

机构：

[1] NASA, John H Glenn Res Ctr Lewis Field, Acoust Branch, Cleveland, OH 44135 USA

[2] NASA, Langley Res Ctr Res, Res & Technol Directorate, Struct Acoust Branch, Hampton, VA 23681 USA

来源：

JOURNAL OF AIRCRAFT | 2009年 / 46卷 / 04期

关键词：

ACOUSTIC PROPERTIES;

D O I：

10.2514/1.41369

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

A foam-metal liner for attenuation of fan noise was developed for and tested on a low-speed fan. This type of liner represents a significant advance over traditional liners, due to the possibility of placement in close proximity to the rotor. An advantage of placing treatment in this region is that the acoustic near field is modified, thereby inhibiting the noise-generation mechanism. This can result in higher attenuation levels than could be achieved by liners located in the nacelle inlet. In addition, foam-metal liners could potentially replace the fan rub strip and containment components, ultimately reducing engine components and thus weight, which can result in a systematic increase in noise reduction and engine performance. Foam-metal liners have the potential to reduce fan noise by 4 dB based on this study.

引用

页码：1381 / 1394

页数：14