On the noise reduction mechanisms of porous aerofoil leading edges

On the noise reduction mechanisms of porous aerofoil leading edges
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多孔翼型前缘降噪机理研究

DOI:
10.1016/j.jsv.2020.115574
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发表时间:
2020
影响因子:
4.7
通讯作者:
Chaitanya P
Chaitanya P
中科院分区:
工程技术2区
文献类型:
--
作者:
Chaitanya P

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本文主要是通过引入翼型孔隙度来降低湍流-翼型干扰噪声的实验研究。在本文中,我们研究了三种情况应用于平板:(A)当平板是完全多孔的时,(B)当平板从前缘开始部分多孔时,以及(C)当孔隙率在前缘下游引入时。本文表明,当与无量纲频率fL/U作图时,降噪谱崩塌,其中fL/U是孔道长度,U是流速。在部分多孔翼型上进行的窄带测量表明,其降噪谱具有许多窄峰的特征。本文提出了解释这一行为的两种主要机制。根据在相对较小攻角的真实翼型上测量的降噪效果,验证了降噪机制的有效性。本文的主要发现之一是,仅使用翼型前缘下游的单排孔,就可以获得显著的降噪水平。这种下游孔隙率的使用被特别证明能够在不增加高频辐射噪声的情况下提供低频噪声降低。
This paper is predominantly an experimental study into the reduction of turbulence - aerofoil interaction noise by the introduction of aerofoil porosity. In this paper we study three scenarios applied to flat plates: (a) when the flat plate is fully porous, (b) when the flat plate is partially porous from the leading edge and (c) when porosity is introduced downstream of the leading edge. This paper shows that the noise reduction spectra collapse when plotted against non-dimensional frequencyfl/U, wherelis the length of porous section andUis the flow velocity. Narrow band measurements on a partially porous aerofoil have shown that its noise reduction spectra is characterised by a number of narrow peaks. This paper proposes two main mechanisms for explaining this behaviour. The noise reduction mechanisms are validated against noise reductions measured on a realistic aerofoil at relatively low angles of attack. One of the key findings of this paper is that, by using only a single row of holes downstream of the aerofoil leading edge one can obtain significant levels of noise reduction. This use of downstream porosity is specifically shown to be capable of providing low-frequency noise reductions without increasing the radiated noise at higher frequencies.
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