Explortion of the linear disturbance modes in a wall-bounded turbulent shear flow and bridging the gap between their structures and the turbulent statistics

探索壁面湍流剪切流中的线性扰动模式，并弥合其结构与湍流统计之间的差距

• 批准号: 22560161
• 负责人: MATSUBARA Masaharu
• 金额: $ 2.75万
• 依托单位: Shinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560161/
• 关键词: 乱流; 安定性; せん断流

In this study, artificial pulse jet disturbance from to a wall surface is introduced to a flat-plate turbulent boundary layer using a small speaker and development of the disturbancewas investigated using hot wire anemometry. The velocity signals were ensemble-averaged with phase of the initial disturbance. This averaging enables extraction of disturbance components related to the artificial disturbance. The result shows that their disturbance structure does not depend on strength of the initial disturbance and that amplitude of these disturbances are proportional to that of the initial disturbance. This is evidence that there exist linear disturbances in a turbulent boundary layer. This linear disturbance would be greatly utilized in analysis and prediction of turbulence statistics in not only the turbulent jet but also wide-ranging turbulent shear flows.

在这项研究中，人工脉冲射流干扰从一个壁面被引入到平板湍流边界层使用一个小扬声器和扰动的发展进行了研究，使用热线风速仪。速度信号与初始扰动的相位进行整体平均。该平均使得能够提取与人工干扰相关的干扰分量。结果表明，它们的扰动结构不依赖于初始扰动的强度，扰动的幅值与初始扰动的幅值成正比。这是湍流边界层中存在线性扰动的证据。这种线性扰动不仅可用于湍流射流的湍流统计分析和预报，而且可用于大范围湍流剪切流的湍流统计分析和预报。

项目成果

Experimental Study of Linear Disturbance in a Turbulent Boundary Layer

湍流边界层线性扰动的实验研究

• 发表时间: 2012
• 作者: Konosuke Matsumoto;Taiki Mishiba;Yasuyuki Sendai and Masaharu Matsubara
• 通讯作者: Yasuyuki Sendai and Masaharu Matsubara

Influence of tripping on spatiotemporal correlation between velocity and wall pressure in a turbulent boundary layer

湍流边界层中脱扣对速度与壁压时空相关性的影响

• 发表时间: 2012
• 作者: Masaharu Matsubara;Yasuyuki Sendai;Konosuke Matsumoto and Taiki Mishiba
• 通讯作者: Konosuke Matsumoto and Taiki Mishiba

周期パルス加熱式熱線を用いた乱流測境界層計測

使用周期脉冲加热型热丝进行湍流边界层测量

• 发表时间: 2011
• 作者: 三柴大輝;仙台康之;松本幸之輔,松原雅春
• 通讯作者: 松本幸之輔,松原雅春

平板乱流境界層内での線形撹乱の構造について

平板湍流边界层线性扰动的结构

• 发表时间: 2013
• 作者: 松本幸之輔,長崎将成,松原雅春

Linear Disturbance Excited by a Finite Initial Disturbance in a Turbulent Boundary Layer

湍流边界层中有限初始扰动激发的线性扰动

• 发表时间: 2011
• 作者: Kounosuke Matsumoto;YasuyukiSendai;Taiki Mishiba;Masaharu Matsubara
• 通讯作者: Masaharu Matsubara