Jet Noise and Wing Installation Effects of Circular, Beveled and Rectangular Nozzles

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2024-02-26 DOI:10.1007/s10494-024-00533-7

Julien Christophe, Julien de Decker, Christophe Schram

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Abstract

With the growth of modern turbofan engines, their integration under the wing becomes challenging and induces aerodynamic and acoustic interactions between the jet exhaust and the airframe. Jet noise reduction techniques have been widely studied over the past decades but their efficiency has still to be demonstrated once installed. The present lab-scale jet experiments at Mach 0.6 compare the noise radiated by beveled and rectangular installed nozzles to circular ones on a quarter-sphere radiation map using a microphone antenna. For all radiation angles, modified nozzles show an amplitude decrease of the jet-plate interaction tones of the noise spectra attributed to a strong coupling between the jet shear layers and the sound scattering at the plate trailing edge. Beveled nozzles achieve a noise reduction for all radiation angles with a maximum decrease up to 2 dB at receiver locations perpendicular to the plate. While rectangular nozzles show a similar behavior, a sound increase is observed for listeners parallel to the plate when the height-to-width ratio is small.

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圆形、斜面和矩形喷嘴的喷气噪声和机翼安装效果

随着现代涡扇发动机的发展，将其集成到机翼下变得具有挑战性，并导致喷气机排气和机身之间的空气动力和声学相互作用。在过去的几十年中，喷气机降噪技术得到了广泛的研究，但其效率仍有待安装后的验证。本实验室规模的 0.6 马赫喷气实验使用传声器天线在四分之一球辐射图上比较了斜面喷嘴和矩形喷嘴与圆形喷嘴辐射的噪声。在所有辐射角度下，改进型喷嘴的噪声频谱中喷流-板相互作用音的振幅都有所下降，这归因于喷流剪切层与板后缘声散射之间的强耦合。斜面喷嘴在所有辐射角度下都能降低噪声，在垂直于板的接收器位置，最大降幅可达 2 分贝。虽然矩形喷嘴也有类似的表现，但当高宽比较小时，平行于板的听者会观察到声音增大。

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

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.