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

本研究的主题是声波在沿固体壁面的主流中传播时，在与固体壁面相邻的边界层中产生的声波流动。对于第一种方法，声学驻波在有平均流和无平均流的管道中的流动通过激光扫描法的可视化和热线风速仪的振荡流速度测量来证实。然后讨论了有限振幅波动在Hartmann-Sprenger管中产生的热声流动效应和Ranque-Hilsch管中强哨声产生的流动效应。研究结果如下：1.矩形管道中驻波流动的可视化图样与Rayliegh勋爵二维分析的结果不同。2.哈特曼-斯普林格管内的热声效应由振荡模式对应的壁面温度分布表示。3.从理论上预测了在Ranque-Hilsch管内旋流产生的强哨鸣声引起的声流改变了切向速度分布，导致径向总温度分离。

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.