摘要
采用大涡模拟(LES)结合Ffowcs Williams-Hawkings(FW-H)方程研究了波浪前缘对后掠叶片前缘宽频噪声的降噪效果。通过放置于叶片上游的圆柱产生各向异性的湍流,湍流与后掠叶片相互干涉产生宽频噪声。气流流速设置为40m/s,基于叶片弦长和基于圆柱直径的雷诺数约为400000和26000。在该研究中,研究对象为直前缘后掠叶片和波浪前缘后掠叶片。结果表明:当来流为各向异性的湍流时,波浪前缘可以降低叶片干涉噪声,并且在各个远场方位角下均能降低噪声总声压级而不改变其指向性,添加波浪前缘叶片降噪量约为2.3~3.4 dB。通过分析计算流场发现,波浪前缘可以改变后掠叶片前缘周围气流的流动方式,降低叶片前缘周围的压力脉动和叶片的不稳定载荷。
A hybrid LES/FW-H simulation is performed to investigate the leading-edge broadband noise reduction of a sweep blade with Wavy Leading Edge(WLE)configuration.The noise radiation from the sweep blade leading-edge is generated by the interaction of the blade and incoming anisotropic turbulence(Blade-Turbulence Interaction noise,BTI noise)which is produced by a rod whose wake impinges onto the downstream blade.The incoming flow velocity is 40 m/s and the corresponding blade chord based and rod diameter based Reynolds number is about 400,000 and 26,000 respectively.A Straight leading Edge(SLE)blade and a WLE blade are simulated in the study.Results show that the WLE can substantially reduce BTI noise when the incoming turbulence is anisotropic,and it can mitigate noise radiation at all the azimuthal angles without significantly changing the noise directivity.The OASPL of the BTI noise reduction associated with the WLE is approximately 2.43.4 dB.It is found that WLE can significantly change the flow pattern around the leading edge of swept blade.The present results show that the pressure fluctuation around the blade leading edge and the unsteady load on the swept blade were significantly reduced with the using of WLE configuration.
作者
卯鲁秦
郭鑫
黎霖
乔渭阳
仝帆
MAO Lu-Qin;GUO Xin;LI Lin;QIAO Wei-Yang;TONG Fan(School of Power and Energy,Northwestern Polytechnical University,XVan 710129,China;China Aerodynamics Research and Development Center,Mianyang 621000,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2021年第8期1979-1988,共10页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51936010,No.51776174)
国家科技重大专项资助项目(No.2017-Ⅱ-0008-0022)。
关键词
仿生学
宽频噪声
大涡模拟
波浪前缘
后掠叶片
bionics
broadband noise
large eddy simulation
wavy leading edge
sweep blade
