化工学报 ›› 2020, Vol. 71 ›› Issue (S1): 57-67.DOI: 10.11949/0438-1157.20191163
收稿日期:
2019-10-10
修回日期:
2019-10-20
出版日期:
2020-04-25
发布日期:
2020-04-25
通讯作者:
张旭
作者简介:
张倩茹(1990—),女,博士研究生,基金资助:
Qianru ZHANG(),Xu ZHANG(),Wei YE,Chengqiang ZHI,Yixiang HUANG,Wenxuan ZHAO,Jun GAO
Received:
2019-10-10
Revised:
2019-10-20
Online:
2020-04-25
Published:
2020-04-25
Contact:
Xu ZHANG
摘要:
在实际的工业场景中,机器设备等障碍物的存在对污染物的扩散及分布有着很重要的影响。考虑了在有障碍物的大空间中,泄漏位置在障碍物两侧的场景。定义了污染源重力作用强度指标、无量纲浓度以及易燃易爆区域占比。用实验验证了计算流体力学(CFD)模型的准确性,进而用CFD计算了不同污染物释放速率时的速度场及浓度场。计算结果表明,随着污染物释放速率的增加,速度场的结构和浓度场的分布形式都发生变化。当无量纲数θinlet超过0.0288时,污染源附近会出现新的涡流,而无量纲浓度分布开始出现垂直分层的趋势。当污染源体积释放速率超过2.66667×10-5 m3/s时易燃易爆区域的大小变得显著,导致潜在的爆炸风险。
中图分类号:
张倩茹, 张旭, 叶蔚, 职承强, 黄奕翔, 赵文萱, 高军. 大空间重气泄漏下速度场、浓度场特性分析[J]. 化工学报, 2020, 71(S1): 57-67.
Qianru ZHANG, Xu ZHANG, Wei YE, Chengqiang ZHI, Yixiang HUANG, Wenxuan ZHAO, Jun GAO. Analysis of velocity and concentration field characteristics of heavy gas leakage in large space[J]. CIESC Journal, 2020, 71(S1): 57-67.
工况名称 | 换气次数/h-1 | 污染源位置/m | 污染源释放强度/ (kg/(m3·s)) |
---|---|---|---|
A1 | 3 | (0,4,0.5) | 1 |
A2 | 3 | (0,4,0.5) | 5 |
A3 | 3 | (0,4,0.5) | 10 |
A4 | 3 | (0,4,0.5) | 20 |
A5 | 3 | (0,4,0.5) | 50 |
B1 | 3 | (0,2,0.5) | 1 |
B2 | 3 | (0,2,0.5) | 5 |
B3 | 3 | (0,2,0.5) | 10 |
B4 | 3 | (0,2,0.5) | 20 |
B5 | 3 | (0,2,0.5) | 50 |
表1 模拟工况
Table 1 Simulation configurations
工况名称 | 换气次数/h-1 | 污染源位置/m | 污染源释放强度/ (kg/(m3·s)) |
---|---|---|---|
A1 | 3 | (0,4,0.5) | 1 |
A2 | 3 | (0,4,0.5) | 5 |
A3 | 3 | (0,4,0.5) | 10 |
A4 | 3 | (0,4,0.5) | 20 |
A5 | 3 | (0,4,0.5) | 50 |
B1 | 3 | (0,2,0.5) | 1 |
B2 | 3 | (0,2,0.5) | 5 |
B3 | 3 | (0,2,0.5) | 10 |
B4 | 3 | (0,2,0.5) | 20 |
B5 | 3 | (0,2,0.5) | 50 |
污染源释放强度/(kg/(m3·s)) | θinlet |
---|---|
1 | 0.0106 |
5 | 0.0181 |
10 | 0.0228 |
20 | 0.0288 |
50 | 0.0390 |
表2 各污染源释放强度对应的θinlet值
Table 2 θinlet values for each contaminant release rate
污染源释放强度/(kg/(m3·s)) | θinlet |
---|---|
1 | 0.0106 |
5 | 0.0181 |
10 | 0.0228 |
20 | 0.0288 |
50 | 0.0390 |
图9 污染源在A(0,4 m,0.5 m)时Z=0.5 m平面的速度云图与流线
Fig.9 Velocity magnitude contours and streamlines on Z=0.5 m plane when contaminant source is at A(0, 4 m, 0.5 m)
图11 污染源在A(0,4 m,0.5 m)时对称平面的速度云图与流线
Fig.11 Velocity magnitude contours and streamlines on symmetry plane when contaminant source is at A(0, 4 m, 0.5 m)
图10 污染源在A(0,4 m,0.5 m)时Z =0.2 m平面的速度云图与流线
Fig.10 Velocity magnitude contours and streamlines on Z=0.2 m plane when contaminant source is at A(0, 4 m, 0.5 m)
图12 污染源在B(0,2 m,0.5 m)时Z =0.5 m平面的速度云图与流线
Fig.12 Velocity magnitude contours and streamlines on Z=0.5 m plane when contaminant source is at B(0, 2 m, 0.5 m)
图13 污染源在B(0,2 m,0.5 m)时Z =0.2 m平面的速度云图与流线
Fig.13 Velocity magnitude contours and streamlines on Z=0.2 m plane when contaminant source is at B(0, 2 m, 0.5 m)
图14 污染源在B(0,2 m,0.5 m)时对称平面的速度云图与流线
Fig.14 Velocity magnitude contours and streamlines on symmetry plane when contaminant source is at B(0, 2 m, 0.5 m)
1 | Goodfellow H D, Tähti E. Industrial Ventilation Design Guidebook[M]. Salt Lake City: Academic Press, 2001. |
2 | Ricciardi L, Prevost C, Bouilloux L, et al. Experimental and numerical study of heavy gas dispersion in a ventilated room[J]. Journal of Hazardous Materials, 2008, 52(2): 493-505. |
3 | Foat T G, Nally J, Parker S T. Investigating a selection of mixing times for transient pollutants in mechanically ventilated, isothermal rooms using automated computational fluid dynamics analysis[J]. Building and Environment, 2017, 118: 313-322. |
4 | Cheng L, Li B Z, Cheng Q X, et al. Investigations of indoor air quality of large department store buildings in China based on field measurements[J]. Building and Environment, 2017, 118: 128-143. |
5 | Rohdin P, Moshfegh B. Numerical predictions of indoor climate in large industrial premises. A comparison between different k-ε models supported by field measurements[J]. Building and Environment, 2007, 42(11): 3872-3882. |
6 | Finlayson E, Gadgil A, Thatcher T, et al. Pollutant dispersion in a large indoor space (Ⅱ): Computational fluid dynamics predictions and comparison with a scale model experiment for isothermal flow[J]. Indoor Air, 2004, 14(4): 272-283. |
7 | Tominaga Y, Stathopoulos T. CFD simulations of near-field pollutant dispersion with different plume buoyancies[J]. Building and Environment, 2018, 131: 128-139. |
8 | Tominaga Y, Akabayashi S I, Kitahara T, et al. Air flow around isolated gable-roof buildings with different roof pitches: wind tunnel experiments and CFD simulations[J]. Building and Environment, 2015, 84: 204-213. |
9 | Yin S, Li Y G, Fan Y F, et al. Unsteady large-scale flow patterns and dynamic vortex movement in near-field triple buoyant plumes[J]. Building and Environment, 2018, 142: 288-300. |
10 | Bert B. LES over RANS in building simulation for outdoor and indoor applications: a foregone conclusion?[J]. Building Simulation, 2018, 11: 821-870. |
11 | Khan J A, Feigley C E, Lee E, et al. Effects of inlet and exhaust locations and emitted gas density on indoor air contaminant concentrations[J]. Building and Environment, 2006, 41(7): 851-863. |
12 | Blackmore D R, Herman M N, Woodward J L. Heavy gas dispersion models[J]. Journal of Hazardous Materials, 1982, 6(1/2): 107-128. |
13 | Britter R E, Mcquaid J. Workbook on the dispersion of dense gases[J]. Health & Safety Executive, 1988, 17: 129-134. |
14 | Britter R E. The ground level extent of a negatively buoyant flume in the turbulent boundary layer[J]. Atmospheric Environment, 1980, 14(7): 779-785. |
15 | Britter R E, Hanna S R. Flow and dispersion in urban areas[J]. Annual Review of Fluid Mechanics, 2003, 35(1): 469-496. |
16 | Yaglou C, Witheridge W. Ventilation requirement (Ⅱ)[J]. ASHRAE Trans., 1937, 42: 423-436. |
17 | Sandberg M. What is ventilation efficiency?[J]. Building and Environment, 1981, 16(2): 123-135. |
18 | Sandberg M, Sjöberg M. The use of moments for assessing air quality in ventilated rooms[J]. Building and Environment, 1983, 18(4): 181-197. |
19 | Etheridge D W, Sandberg M. Building Ventilation: Theory and Measurement[M]. Chichester: John Wiley & Sons, 1996. |
20 | Murakami S. Diffusion characteristics of airborne particles with gravitational setting in an convection-dominant indoor flow field[J]. ASHRAE Transactions, 1992, 98(1): 82-97. |
21 | Kato S. New ventilation efficiency scales based on spatial distribution of contaminant concentration aided by numerical simulation[J]. ASHRAE Transactions, 1988, 94(2): 309-330. |
22 | Kato S. New scales for evaluating ventilation efficiency as affected by supply and exhaust opening based on spatial distribution of contaminant[C]//Proceeding of International Symposium on Room Air Convection and Ventilation Effectiveness. 1992. |
23 | Kato S, Murakami S, Kondo Y. Numerical simulation of two-dimensional room airflow with and without buoyancy by means of ASM[J]. Transactions-American Society of Heating Refrigerating and Air Conditioning Engineers, 1994, 100: 238. |
24 | Li X, Zhao B. Accessibility: a new concept to evaluate ventilation performance in a finite period of time[J]. Indoor and Built Environment, 2004, 13(4): 287-293. |
25 | Li X, Chen J. Evolution of contaminant distribution at steady airflow field with an arbitrary initial condition in ventilated space[J]. Atmospheric Environment, 2008, 42(28): 6775-6784. |
26 | Yang J, Li X, Zhao B. Prediction of transient contaminant dispersion and ventilation performance using the concept of accessibility[J]. Energy and Buildings, 2004, 36(3): 293-299. |
27 | Ma X, Shao X, Li X, et al. An analytical expression for transient distribution of passive contaminant under steady flow field[J]. Building and Environment, 2012, 52: 98-106. |
28 | Nielsen P V, Allard F, Awbi H B, et al. Computational Fluid Dynamics in Ventilation Design REHVA Guidebook No. 10[M]. Abingdon: Taylor & Francis, 2007. |
29 | Versteeg H K, Malalasekera W. An Introduction to Computational Fluid Dynamics: the Finite Volume Method[M]. New York: Pearson Education, 2007. |
30 | Britter R E. Atmospheric dispersion of dense gases[J]. Annual Review of Fluid Mechanics, 1989, 21(1): 317-344. |
31 | Britter R E. A review of some mixing experiments relevant to dense gas dispersion[M]//Stably Stratified Flow and Dense Gas Dispersion. Oxford: Clarendon Press, 1988: 1-38. |
32 | Zhang Q, Zhang X, Ye W, et al. Experimental study of dense gas contaminant transport characteristics in a large space chamber[J]. Building and Environment, 2018, 138: 98-105. |
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