振動壁を有する二次元チャンネル内の乱流特性

振动壁二维通道内的湍流特性

• 批准号: 07650187
• 负责人: NAKAMURA Masahide
• 金额: $ 0.32万
• 依托单位: Akita University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650187/
• 关键词: turbuelence; transitional flow; internal flow; pressure distribution; velocity; experimental study; oscillating wall; 二次元流れ; 運動壁; レイノルズ数

The pressure distributions, velocity distributions and turbulence intesities of the flow through a two-dimensional channel with oscillating wall were measured experimentally. In this study, the experiments were performed in vicinity of the transitional flow region. The experimental results are summarized as follows.(1) pressure :a.The steady components of pressure distribution are distorted strongly by the oscillating wall whose frequency lies in vicinity of 30Hz.b.This effect becomes weak with the increase in Reynolds number.(2) velocity and turbulent intensity :a.The oscillation of wall has an effect to flatten the axial component of avedaged velocities and to increase the turbulence intensity.b.The increase in the wall oscillating frequency and the decrease in the Reynolds number strengthen the distortion of power spectrum due to the wall oscillating effect. Moreover, the distortion of power spectrum is clearly noticed in the low frequency region below 400Hz.

实验测量了具有振动壁面的二维通道内的压力分布、速度分布和湍流强度。在这项研究中，实验是在附近的过渡流区。实验结果总结如下。(1)压力：a.频率在30Hz附近的振荡壁对压力分布的定常分量产生强烈的畸变。b.这种影响随雷诺数的增大而减弱。(2)结果表明：（1）壁面振荡使平均速度的轴向分量变平，湍流强度增大，（B）壁面振荡频率的增大和雷诺数的减小使功率谱畸变加剧。在400Hz以下的低频区域，功率谱的畸变明显。