"Ladder" structure in tonal noise generated by laminar flow around an airfoil

被引：42

作者：

Chong, Tze Pei ^{[1
]}

Joseph, Phillip ^{[2
]}

机构：

[1] Brunel Univ, Sch Engn & Design, Uxbridge UB8 3PH, Middx, England

[2] Univ Southampton, Inst Sound & Vibrat Res, Southampton SO17 1BJ, Hants, England

来源：

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2012年 / 131卷 / 06期

关键词：

AEROFOIL; TONES;

D O I：

10.1121/1.4710952

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The presence of a "ladder" structure in the airfoil tonal noise was discovered in the 1970s, but its mechanism hitherto remains a subject of continual investigation in the research community. Based on the measured noise results and some numerical analysis presented in this letter, the variations of four types of airfoil tonal noise frequencies with the flow velocity were analyzed individually. The ladder structure is proposed to be caused by the acoustic/hydrodynamic frequency lag between the scattering of the boundary layer instability noise and the discrete noise produced by an aeroacoustic feedback loop. (C) 2012 Acoustical Society of America

引用

页码：EL461 / EL467

页数：7

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