Numerical calculation of fire flue gas filling in ship engine room with multilayer structure
-
摘要: 应用大涡模拟技术, 建立了多层结构船舶机舱火灾的过滤平衡方程组与Smagorinsky亚格子模型。采用二阶有限差分法对空间变量进行离散, 采用显式二阶预估校中法对流动变量进行离散, 采用显式二阶Runge-Kutta法对时间变量进行离散, 分别求解了速度场、温度场、烟气浓度与烟气层高度, 比较了多层结构与单层结构船舶机舱火灾烟气充填变化规律。分析结果表明: 多层结构烟气蔓延速度与面积大于单层结构烟气蔓延速度与面积; 在单层结构中, 烟气在200s时快速充满整个舱室, 在多层结构中, 烟气在1 500s时充满整个舱室; 在2种结构下, 冷空气层与热烟气层温度随时间的增长先升高后降低, 在机舱上部的最高温度分别为170℃与250℃; 在机舱底部, 多层结构与单层结构的最高温度分别为175℃与100℃。Abstract: Based on large eddy simulation, the filtered balance equations and the Smagorinsky subgrid-scale model of fire in ship engine room with multilayer structure were established.Second-order finite difference method was used to disperse spatial variables, explicit second-order predictor-corrector scheme method was used to disperse flow variables, and explicit second-order Runge-Kutta method was used to disperse time variables.Velocity field, temperature field, flue gas concentration and the height of flue gas layer were solved respectively, and the change laws of fire flue gas filling in ship engine rooms with multilayer structure and monolayer structure were analyzed.Analysis result shows that the spread speed and area of flue gas in multilayer structure are greater than those in monolayer structure.When ship engine room with monolayer structure is full of flue gas, filling time is 200 s, while the filling time of ship engine room with multilayer structure is 1 500 s.Under two structures, the temperatures of cold air layer and hot flue gas layer almost increase at first then decrease, the maximum temperatures at the tops of ship engine rooms are 170 ℃, 250 ℃ respectively, however, the maximum temperatures at the bottoms of ship engine rooms are 175 ℃, 100 ℃ respectively.
-
Key words:
- ship safety /
- ship engine room /
- multilayer structure /
- fire /
- flue gas filling /
- large eddy simulation
-
图 1 多层结构模型
1-通风管道; 2-主柴油机发电机组; 3-主机; 4-火源点; 5-舱门; 6-机修间
Figure 1. Model of multilayer structure
-
[1] KUO H C, CHANG H K. A real-time shipboard fire-detection system based on grey-fuzzy algorithms[J]. Fire Safety Journal, 2003, 38(4): 341-363. doi: 10.1016/S0379-7112(02)00088-7 [2] 邹高万, 刘顺隆, 周允基, 等. 中国船舶机舱火灾研究现状[J]. 中国安全科学学报, 2004, 14(5): 76-79. doi: 10.3969/j.issn.1003-3033.2004.05.019ZOU Gao-wan, LIU Shun-long, CHOW W K, et al. Survey of ship engine-room fire in China[J]. China Safety Science Journal, 2004, 14(5): 76-79. (in Chinese) doi: 10.3969/j.issn.1003-3033.2004.05.019 [3] 高璞珍, 刘顺隆, 周允基. 商业街火灾烟气流动的大涡模拟[J]. 热科学与技术, 2004, 3(2): 116-120. https://www.cnki.com.cn/Article/CJFDTOTAL-RKXS200402005.htmGAO Pu-zhen, LIU Shun-long, CHOW W K. Large eddy simulation of smoke movement in mall[J]. Journal of Thermal Science and Technology, 2004, 3(2): 116-120. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-RKXS200402005.htm [4] OWRUTSKY J C, STEINHURST D A, MINOR C P, et al. Long wavelength video detection of fire in ship compartments[J]. Fire Safety Journal, 2006, 41(4): 315-320. doi: 10.1016/j.firesaf.2005.11.011 [5] LUA J, O'BRIEN J, KEY C T, et al. A temperature and mass dependent thermal model for fire response prediction of marine composites[J]. Composites Part A: Applied Science and Manufacturing, 2006, 37(7): 1024-1039. doi: 10.1016/j.compositesa.2005.01.034 [6] 邹高万. 船舶机舱火灾热流场特性研究[D]. 哈尔滨: 哈尔滨工程大学, 2005.ZOU Gao-wan. A study on thermal flow field characteristics of plant room fires on ship[D]. Harbin: Harbin Engineering University, 2005. (in Chinese) [7] 邹高万, 谈和平, 刘顺隆, 等. 船舶大空间舱室火灾烟气填充研究[J]. 哈尔滨工程大学学报, 2007, 28(6): 616-620. doi: 10.3969/j.issn.1006-7043.2007.06.003ZOU Gao-wan, TAN He-ping, LIU Shun-long, et al. Studies of smoke filling process in large space cabin in ship[J]. Journal of Harbin Engineering University, 2007, 28(6): 616-620. (in Chinese) doi: 10.3969/j.issn.1006-7043.2007.06.003 [8] 苏石川, 王亮, 聂宇宏, 等. 某船舶机舱火灾发展过程中的数值模拟与策略分析[J]. 消防科学与技术, 2009, 28(1): 15-19. https://www.cnki.com.cn/Article/CJFDTOTAL-XFKJ200901009.htmSU Shi-chuan, WANG Liang, NIE Yu-hong, et al. Numerical simulation and strategy analysis of fire development process in a certain ship engine-room[J]. Fire Science and Technology, 2009, 28(1): 15-19. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XFKJ200901009.htm [9] WANG Liang, SU Shi-chuan, NIE Yu-hong. Modeling and characteristic analysis of the flashover of fire in a ship engine room[C]//LI Sheng-cai, WANG Wei-ye, AN Ying. Proceedings of the 2010 Internation Symposium on Safety Science and Technology. Beijing: Science Press, 2010: 610-615. [10] 苏石川, 王亮, 聂宇宏, 等. 某船舶机舱火灾数值模拟中的火旋风及其危害性分析[J]. 中国造船, 2009, 50(3): 113-119. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGZC200903014.htmSU Shi-chuan, WANG Liang, NIE Yu-hong, et al. Firewhirl and its harmfulness analysis in the numerical simulation of fire in a ship engine-room[J]. Shipbuilding of China, 2009, 50(3): 113-119. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGZC200903014.htm [11] 王志国, 杨志青, 冯明初, 等. 舰船大空间舱室火灾模拟及防火设计[J]. 海军工程大学学报, 2003, 15(4): 42-44. https://www.cnki.com.cn/Article/CJFDTOTAL-HJGX200304011.htmWANG Zhi-guo, YANG Zhi-qing, FENG Ming-chu, et al. Fire simulation and fireproofing design of big cabin in warship[J]. Journal of Naval University of Engineering, 2003, 15(4): 42-44. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-HJGX200304011.htm [12] 蒋勇, 邱榕, 刘乃安. 湍流反应流研究中的大涡模拟[J]. 消防科学与技术, 2005, 24(1): 15-18. https://www.cnki.com.cn/Article/CJFDTOTAL-XFKJ200501003.htmJIANG Yong, QIU Rong, LIU Nai-an. Large eddy simulation in turbulent combustion research[J]. Fire Science and Technology, 2005, 24(1): 15-18. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XFKJ200501003.htm [13] BANJAC M J, NIKOLIC B M. Computational study of smoke flow control in garage fires and optimisation of ventilation system[J]. Thermal Science, 2009, 13(1): 69-78. [14] BATTAGLIA F, MCGRATTAN K B, REHM R G, et al. Simulating fire whirls[J]. Combustion Theory and Modelling, 2000, 4(2): 123-138. [15] 陈国庆, 陆守香. 船舶机舱复杂空间烟气运动工程分析方法研究[J]. 消防科学与技术, 2004, 23(5): 417-420. https://www.cnki.com.cn/Article/CJFDTOTAL-XFKJ200405002.htmCHEN Guo-qing, LU Shou-xiang. Preliminary study on engineering method to predict smoke movement in complex spaces of engine room[J]. Fire Science and Technology, 2004, 23(5): 417-420. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XFKJ200405002.htm -
下载:
点击查看大图
图(5) / 表(3)
计量
- 文章访问数: 521
- HTML全文浏览量: 88
- PDF下载量: 444
- 被引次数: 0
