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首页> 美国政府科技报告 >Video Images of Smoke Dispersion in the Near Wake of a Model Building. Part 1. Temporal and Spatial Scales of Vortex Shedding
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Video Images of Smoke Dispersion in the Near Wake of a Model Building. Part 1. Temporal and Spatial Scales of Vortex Shedding

机译：模型建筑近尾迹烟雾弥散的视频图像。第1部分：涡旋脱落的时空尺度

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In a wind-tunnel study, recorded video images of smoke dispersion in the wake of a rectangular-shaped building were analyzed. A continuous source of smoke was emitted at floor level, midway along the leeward side of the building. Smoke was observed to build up within a region adjacent to the building. Then the smoke was periodically swept away by vortices shed from the leeward building sides and roof. The applicability of analyzing time series of smoke scattered light for selected quantized video picture elements was favorably demonstrated. Temporal and spatial scales of vortex-shedding of smoke puffs near the center of the wake were quantified through the calculation of spectral densities and autocorrelations. The dominant frequencies (cycles/second) near the center of the wake flow were found to be 0.1-0.3 times the ratio of the velocity to the building height. Estimated integral length scales near the center of the wake flow were found to be 1-2 times the building height.

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