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Basic research of the generation mechanism of aerodynamic noise-Development to complex flow fields and control of the noise-

气动噪声产生机理的基础研究-复杂流场的开发与噪声控制-

基本信息

批准号：
16360085
负责人：
INOUE Osamu
金额：
$ 9.22万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360085/
关键词：
Aerodynamic noise Aeolian tones Cavity noise Jet noise

项目摘要

In this project, the generation and propagation mechanisms of aerodynamic noises generated in complex flow fields have were investigated. Inoue and Hatakeyama developed a highly-accurate finite difference numerical scheme (8-th order accurate in space and 4-th order in time) to solve the unsteady compressible Navier-Stokes equations. They applied the scheme to noise problems generated by multiple bodies placed in a uniform flow and found that flow and sound fields vary drastically depending on the spacing between the bodies. For the case of two bodies placed in tandem in a uniform flow, they found that the amplitude of sound waves is greatly suppressed (up to 1/50 of the single body case) or enhanced (up to ten times as large as the single body case), depending on the spacing of the bodies. For the case of two bodies in a side-by-side arrangement, they found that 6 different patterns of flow and sound fields appear depending on the spacing of the bodies. In both cases of tandem and side-by-side arrangement, bifurcation phenomenon was observed depending on initial conditions. These results strongly suggest a possibility of noise control. For the case of three bodies in a side-by-side arrangement, a beat of sound was observed. Fukunishi found experimentally that cavity noise can be suppressed significantly by placing a control panel in the cavity and suggested the possibility of turbulence control by this method. Nakamura investigated numerically supersonic jet noise problems and clarified the generation and propagation mechanisms in some detail. Ishii developed a highly-accurate new computer code and applied it to cavity noise problems. He clarified the importance of the span-length on the generation of the cavity noise.

本课题研究了复杂流场中气动噪声的产生和传播机理。Inoue和Hatakeyama发展了一种高精度的有限差分数值格式（空间上的8阶精度和时间上的4阶精度）来求解非定常可压缩Navier-Stokes方程。他们将该方案应用于由放置在均匀流中的多个物体产生的噪声问题，并发现流场和声场根据物体之间的间距而发生剧烈变化。对于在均匀流中串联放置的两个物体的情况，他们发现声波的振幅被极大地抑制（高达单体情况的1/50）或增强（高达单体情况的十倍），这取决于物体的间距。对于并排布置的两个物体的情况，他们发现根据物体的间距，会出现6种不同的流场和声场模式。在两种情况下的串联和并排的安排，分叉现象观察取决于初始条件。这些结果有力地表明了噪声控制的可能性。对于三个物体并排排列的情况，观察到声音的节拍。西先生通过实验发现，在空腔中放置控制面板可以显著抑制空腔噪声，并提出了通过这种方法控制湍流的可能性。中村用数值方法研究了超音速喷流噪声问题，并详细阐明了其产生和传播机理。石井开发了一种高精度的新计算机代码，并将其应用于空腔噪声问题。他阐明了跨距长度对空腔噪声产生的重要性。

项目成果

期刊论文数量（51）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Accurate Numerical Simulation of Three-dimensional Lid-driven Cavity Flows with Different Span Lengths

不同跨长三维盖驱动空腔流动的精确数值模拟

DOI：
发表时间：
2005
期刊：
Vortex Dominated Flow(eds. D.Blackmore, E.Krause, C.Tung)(World Scientific Publishing Co.)
影响因子：
0
作者：
K.Ishii;K.Matsuoka;S.Yamamoto;K.Hattori;O.Inoue;O.Inoue;O.Inoue;福西祐;Katsuya Ishii
通讯作者：
Katsuya Ishii

Sound Emission from the Helical Mode of Supersonic Jet.

超音速喷气机螺旋模式的声发射。