Response of Turbulent Boundary Layer to Sound Waves Propagating in Main Flow.

湍流边界层对主流中传播的声波的响应。

• 批准号: 62550122
• 负责人: KAWAHASHI Masaaki
• 金额: $ 0.96万
• 依托单位: Saitama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550122/
• 关键词: Acoustic streaming; Secondary flow; Thermoacoustic streaming; Standing wave; Boundary layer; Vortex-tube; Swirling flow; 旋回波; 音響平均流; 定在波

The subject of this research is on the acoustic streaming generated in a boundary layer adjacent to a solid wall resulting when a acoustic wave propagates in a main flow along the wall. For the first approach, the streaming by an acoustic standing wave in a duct with and without mean flow is confirmed by visualizations by means of laser-beam-sweep method and measurements of oscillatory flow velocity by hot wire anemometry. And then, the thermoacoustic streaming effect in Hartmann-Sprenger tube generated by finite amplitude wave motions and the streaming by strong whistling generated in Ranque-Hilsch tubes are discussed. The results obtained by this investigation are as follows; 1. Visualized patterns of the streaming by the standing waves in a rectangular duct are different from the results obtained by two-dimensional analysis under Lord Rayliegh. 2. The thermoacoustic effects in Hartmann-Sprenger tubes are presented by wall temperature distributions corresponding to oscillation modes. 3. It was theoretically predicted that the acoustic streaming resulting from strong whistling generated in swirling flow in Ranque-Hilsch tubes changes tangential velocity destributions, resulting in total temperarure separation in radial direction.

本文研究的是声波在主流中沿着壁面传播时，在壁面边界层中产生的声流。对于第一种方法，通过激光束扫描方法和热线风速仪测量振荡流速的可视化，确认了在管道中有和没有平均流的声驻波流。在此基础上，讨论了Hartmann-Sprenger管中有限幅波动引起的热声流动效应和Ranque-Hilsch管中强哨声引起的热声流动。本研究取得的结果如下：1.矩形管道中驻波流动的可视化模式与瑞利勋爵二维分析得到的结果不同。2.哈特曼-斯普伦格管中的热声效应由对应于振荡模式的壁温分布来表示。3.从理论上预测了朗凯-希尔施管中旋流产生的强烈哨声所产生的声流改变了切向速度分布，导致径向总温分离。

项目成果

川橋正昭: 日本機械学会論文集.

川桥正明：日本机械工程师学会会议录。

川崎正昭: 日本機械学会論文集.

川崎正明：日本机械工程师学会会议录。