WIND TUNNEL MEASUREMENTS OF THE DISPERSION OF TWO IDENTICAL SIDE-BY-SIDE DENSE GAS PLUMES IN THE TURBULENT BOUNDARY LAYER

左右相鄰兩重質氣體羽昇流在紊流邊界層內擴散之風洞量測

10.6652/JoCICHE.201912_31(8).0003

蕭葆羲(Bao-Shi Shiau)；郭品秀(Pin-Hsiu Kuo)；林立(Li Lin)

dense gas plume ； densimetric Froude number ； dispersion length scale ； turbulent boundary layer flow ； two sources in side-by-side ； 重質氣體 ； 密度福祿數 ； 擴散尺度 ； 紊流邊界層流 ； 左右相鄰兩排放源

中國土木水利工程學刊

31卷8期（2019 / 12 / 01）

703 - 709

英文

Industry activities such as steel production or fossil power station have generated a huge amount of CO_2 dense gas. The CO_2 dense gas had been captured and transported through pipeline to store in tanks. Accidents of continuous release of dense gas form the pipeline or storage tank will make a harmful and strong impact on the atmospheric environment. The dispersion of such hazardous gas constitutes a severe human health threat for inhabitants adjacent to the industries and storage areas. In the present study, wind tunnel experiments were performed to determine the dispersion characteristics of CO_2 dense gas continuously spilling from two identical sources with side-by-side in a turbulent boundary layer. Effects of different gaps between two sources and various source discharge strengths on the heavy gas plumes dispersion were conducted in the experiments. Experimental results reveal that two dense plumes do not merge at the near field as the gap of two sources is greater than 30 times of discharged source diameter for the cases of different discharging strength with the densimetric Froude number 20, 22, and 26. The maximum value of vertical concentration profile at each of the downstream station increases with increasing the densimetric Froude number of discharge. The dispersion length scale of merged dense plume increases along with the downstream distance.

本文使用風洞實驗量測研究左右相鄰兩重質氣體羽昇流在紊流邊界層內擴散特性。重質氣體採用二氧化碳，實驗量測探討分析相鄰兩排放源之間距以及排放源密度福祿數對於重質氣體羽昇流濃度擴散特性。實驗結果顯示當兩排放源之間距超過30倍排放源口徑時，兩重質氣體羽昇流在近域處不會交會混合。若排放源密度福祿數增加時，沿排放源下游各垂直剖面之最大濃度值隨之增加。交會混合羽昇流之擴散尺度係沿排放源下游距離而增大。

1. Britter, R. E.(1989).Atmospheric dispersion of dense gases.Annual Review of Fluid Mechanics,21,317-344.
2. Cermak, J.E.(Ed.)(1995).Wind Climate in Cities.
3. Counihan, J.(1975).Adiabatic atmospheric boundary layers: A review and analysis of the data from the period 1880-1972.Atmospheric Environment,9,871-905.
4. Donat, J.,Schatzmann, M.(1999).Wind tunnel experiments of single-phase heavy gas jets released under various angles into turbulent cross flows.Journal of Wind Engineering and Industrial Aerodynamics,83,361-370.
5. Herzog, N.,Egbers, C.(2013).Atmospheric dispersion of CO2 released from pipeline leakage.Energy Procedia,40,232-239.
6. Mernoney, R. N.(2012).CFD modelling of dense gas cloud dispersion over irregular terrain.Journal of Wind Engineering and Industrial Aerodynamics,104-106,500-508.
7. Meroney, R. N.(1982).Wind-tunnel experiments on dense gas dispersion.Journal of Hazardous Materials,6,85-106.
8. Mokhtarzadeh-Dehghan, M. R.,Akcayoglu, A.,Robins, A. G.(2012).Numerical study and comparison with experiment of dispersion of a heavier-than-air gas in a simulated neutral atmospheric boundary layer.Journal of Wind Engineering and Industrial Aerodynamics,110,10-24.
9. Nielsen, M.,Ott, S.,Jorgensen, H. E.,Bengtsson, R.,Nyren, K.,Winter, S.,Ride, D.,Jones, C.(1997).Field experiments with dispersion of pressure liquefied ammonia.Journal of Hazardous Materials,56,59-105.
10. Pham, L. H. H. P.,Rusli, R.(2016).A review of experimental and modelling methods for accidental release behavior of high-pressurized CO2 pipelines at atmospheric environment.Process Safety and Environmental Protection,104,48-84.
11. Robins, A.,Castro, I.,Hayden, P.,Steggel, N.,Contini, D.,Heist, D.(2001).A wind tunnel study of dense gas dispersion in a neutral boundary layer over a rough surface.Atmospheric Environment,35,2243-2252.
12. Schatzmann, M.(1993).Experiments with heavy gas jets in laminar and turbulent cross-flows.Atmospheric Environment,27A,1105-1116.
13. Shiau, B. S.,Hu, R. S.(2015).Dispersion of heavy gas plume interacting with upwind slope topography in the atmospheric turbulent boundary layer.The 3rd Asia Symposium on Engineering and Information,Chengdu, China:
14. Tauseef, S. M.,Rashtchian, D.,Abbasi, S. A.(2011).CFD-based simulation of dense gas dispersion in presence of obstacles.Journal of Loss Prevention in the Process Industries,24,371-376.
15. Zhu, G.,Arya, S. P.,Snyder, W. H.(1998).An experimental study of the flow structure within a dense gas plume.Journal of Hazardous Materials,62,161-186.