LES-RANS of installed ultra-high bypass-ratio coaxial jet aeroacoustics with a finite span wing-flap geometry and flight stream-part 1: Round nozzle
LES-RANS of installed ultra-high bypass-ratio coaxial jet aeroacoustics with a finite span wing-flap geometry and flight stream-part 1: Round nozzle
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具有有限跨度襟翼几何形状和飞行流的已安装超高涵道比同轴喷气气动声学的 LES-RANS - 第 1 部分：圆形喷嘴
DOI：
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
P. Tucker
中科院分区：
文献类型：
--
作者：
J. Tyacke;Zhong;P. Tucker
©2017，美国航空航天研究所，AIAA。版权所有。航空发动机产生的射流噪声是发动机设计中的一个重要问题。大涡模拟（LES）和混合LES- reynolds -平均Navier-Stokes （LES- rans）提供了一种方法来增加对所产生噪声的影响的理解。与孤立射流噪声相比，安装射流噪声建模受到的关注较少，但在设计中却变得越来越重要。本文利用LES-RANS，研究了一种超高涵道比为15的同轴喷管，该喷管具有和不具有翼襟翼几何形状。涵道比使喷管变得非常接近翼瓣几何形状，从而产生强大的安装效果。两个不同的皮瓣偏转8度和14度对比与孤立的圆形喷嘴。应用了一个飞行流，并提出了一种安装射流的FWH表面布置方法。由于襟翼后缘的存在产生了强偶极子源，安装的壳体在中低频产生了更多的方向性噪声。二阶时空相关性揭示了流的长度和时间尺度。四阶空时相关性表明，随着襟翼角的增大，主要噪声源分量的大小增大，这可能导致声学模型的改进。
© 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. The jet noise produced by aeroengines is a critical topic in engine design. Large-Eddy Simulation (LES) and hybrid LES-Reynolds-Averaged Navier-Stokes (LES-RANS), provides a method to increase understanding of influences on the noise produced. Installed jet noise modelling has received less attention than isolated jet noise yet is becoming more important for design. Here, using LES-RANS, a coaxial nozzle with an ultra-high bypass-ratio of 15 is studied with and without a wing-flap geometry. The bypass ratio leads the nozzle to become extremely close to the wing-flap geometry introducing strong installation effects. Two different flap deflections of 8 and 14 degrees are contrasted with an isolated round nozzle. A flight stream is applied and an FWH surface placement procedure for installed jets is proposed. The installed cases generate more directional noise at mid-low frequencies as the presence of the flap trailing edge produces a strong dipole source. Second order space-time correlations reveal length and time scales in the flow. Fourth order space-time correlations indicate increasing magnitudes of the dominant noise source components with in increasing flap angle and may lead to improved acoustics models.
V 形喷嘴和圆形喷嘴的声源和远场噪声
影响因子：
2.5
作者：
Depuru Mohan N
通讯作者：
Depuru Mohan N