Measurement on the Flow and Dispersion of Two Identical Sources in Side-by-Side Discharging over Aligned Array Configuration of Cube in a Turbulent Boundary Layer

左右兩相鄰排放源排放於規則方塊排列之延散量測研究

蕭葆羲(Bao-Shi Shiau) ； 曾彥士(Yen-Shih Tseng)

《海洋工程學刊》 16卷2期 (2016/06) Pp. 55-65

https://doi.org/10.6266/JCOE.2016.1602.01

摘要

This study employed the environmental wind tunnel to investigate the flow and dispersion characteristics of two identical sources in side-by-side discharging over arrays of cube with sparse and dense density. Two identical sources in side-by-side were set apart with different gaps. Mean velocity profiles and turbulence intensity profiles of canopy flows above the array of cube are measured, and it is presented to show the variations for arrays of cube with sparse and dense densities. The measured vertical dispersion parameter is shown to increase with further downstream from the sources. When the deployment of arrays of cube in the downstream of sources changed from sparse density to dense density, the vertical dispersion parameter is found to be larger. After two plumes merged together, averaged height of merged plume increases along with the downstream distance of sources. Analysis of measured concentration profiles reveals that averaged height of the merged plume becomes higher when deployment of arrays of cube downstream of the sources varies from sparse density to dense density.

關鍵字

dispersion ； turbulent boundary layer ； aligned array of cube ； canopy flow ； two sources in side-byside

並列摘要

本文應用風洞模擬都市型中性大氣邊界層流，量測分析探討在左右相鄰兩排放源排放於下游規則方塊排列之擴散特性。實驗之濃度擴散特性結果，其與高斯擴散理論公式比較，二者吻合。當兩排放源形成之雙羽昇流延著下游距離逐漸混合為一，此羽昇流平均高度將隨下游距離之增加而變高。又規則方塊排列之密度變大時，羽昇流之平均高度也隨之增高。

並列關鍵字

延散 ； 紊流邊界層 ； 規則方塊排列 ； 頂蓬流 ； 左右相鄰兩排放源