Wind tunnel study on the line source dispersion over two fences with different distances

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 105 === This study employed the wind tunnel to investigate the flow and dispersion characteristics of line source discharging into two fences with different distances.Results are summarized as follows: (1) The neutral atmospheric turbulent boundary layer flow was si...

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Bibliographic Details
Main Authors: Wu, Hsu-Chiang, 吳旭強
Other Authors: Shiau, Bao-Shi
Format: Others
Language:zh-TW
Published: 2017
Online Access:http://ndltd.ncl.edu.tw/handle/46743m
Description
Summary:碩士 === 國立臺灣海洋大學 === 河海工程學系 === 105 === This study employed the wind tunnel to investigate the flow and dispersion characteristics of line source discharging into two fences with different distances.Results are summarized as follows: (1) The neutral atmospheric turbulent boundary layer flow was simulated as the approaching flow which had the power-law mean velocity profile with exponent n=0.27. The simulated turbulence intensity close to the ground is about 0.2~0.24. The simulation results are found in agreement with the results proposed by Counihan(1975). (2) When the distances between two fences becomes narrower.The gas is easier to accumulate in the street canyon. (3) If the front of the wall beomes higher,the gas go around the wall .The maximum concentration occurs where the location is raised.