INVESTIGATION OF ATMOSPHERIC DISPERSION IN INTERNAL BOUNDARY LAYER

研究了内边界层大气扩散过程.二维和三维紊流风洞的发展。(1)在实验室建立了二维和三维湍流风洞。他们有很多粉丝。二维风洞有11个风扇垂直排列，三维风洞有6个风扇，二维风洞有6个风扇水平排列，所以它有66个风扇作为总数。这些风扇由计算机独立控制。在流道内设置振荡空气流，增加了垂直和水平方向的紊流。在风洞实验中，获得了平均风速、湍流强度、湍流尺度、功率谱等湍流参数的廓线，制作得令人满意。这些实验的结果在第14届风力工程研讨会上发表。(2)自然风具有非常复杂的湍流特性，在风洞中对这些特性进行了模拟。2.利用风洞研究了内边界层大气扩散过程。(1)利用可视化技术对海岸附近的流场进行了观测。(2)在三维风洞中建立了海岸区模型，利用热线风速仪测量了内边界层的流态。(3)将上述测量结果与本课题组开发的喷烟模型进行了比较，取得了满意的一致性。

Atmospheric dispersion process in the internal boundary layr was investigated.1. Development of 2-and 3-dimensional turbulent wind tunnels.(1) Two-and three-dimensional turbulent wind tunnels were built in our laboratory. These have multiple-fans. Two-dimensional wind tunnel has 11 fans arranged vertically, and 3-dimensional one has 6 raws of 2-dimensional one horizontally, so that it has 66 fans as the total. These fans are controlled by computers independently. To add the vertical and horizontal turbulence in the flow, oscilating airfiols are set in the flow channels. In the experiments of these tunnels, the profiles of many turbulent parameters, such as mean wind speeds, turbulence intensities, turbulence scales, power spectra, etc., were produced satisfactorily. The results of these experiments were presented at the 14th wind engineering symposium.(2) Natural wind has very complicated characteristics of turbulence, and these are simulated in the wind tunnels satisfactorily.2.The atmospheric dispersion process in the internal boundary layr was examined by using the wind tunnels.(1) The flow around the shore area was observed by the visualization technique.(2) Flow pattern was measured by the hot-wire anemometers in the internal boundary layr which was produced on the shore area model set in the 3-dimensional wind tunnel.(3) Above measurement results were compared with the puff-fumigation model which had been developed by our group, and a satisfactory agreement was obtained.