Effects of ignition delay time on characteristic parameters of aluminum dust explosion
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摘要: 为了研究装置点火延迟时间对不同浓度粉尘爆炸压力和压力上升速率的影响，以铝粉为介质在5L圆柱形爆炸装置中进行系列爆炸实验。结果表明：装置点火延迟时间对铝粉爆炸压力和压力上升速率有十分显著的影响，且存在一个最佳点火延迟时间，此时最大爆炸压力最大；随着铝粉浓度的增加，最佳点火延迟时间先增加后保持不变。最佳点火延迟时间下的最大爆炸压力和最大压力上升速率明显高于点火延迟时间固定为60s时的。相对粉尘不同浓度均采用固定点火延迟时间，不同浓度时采用最佳点火延迟时间，所测得的粉尘最大爆炸压力和最大压力上升速率明显符合实际。Abstract: According to the time effect of particle dispersion and sedimentation during the dust cloud formation, the paper points out that the internationally accepted method that only by the gas phase turbulence degrees or single dust concentration to set the fixed ignition delay time, is of uncertainty.To investigate the effects of the ignition delay time on the dust explosion pressure and the pressure rise rate, a series of explosion experiments were carried out in a 5－L cylindrical vessel filled with aluminum dust.The results show that the ignition delay time has a significant effect on the measured values of the explosion pressure and the pressure rise rate and there exists an optimum ignition delay time to maximize the explosion pressure.With the increasing of the dust concentration, the optimum ignition delay time increases gradually to the maximum and then remains unchanged.The maximum explosion pressure and the maximum pressure rise rate under the optimum ignition delay time are obviously higher than those under the fixed ignition delay time of 60ms.If the fixed ignition delay time of 60ms is used for all the aluminum dust with different concentrations, the measured maximum explosion pressure and the maximum pressure rise rate may largely deviate from the actual values.
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图 3 不同浓度铝粉点火延迟时间对pmax和（dp/dt）max的影响
Figure 3. Influence of ignition delay time on pmax and(dp/dt)max of different concentration aluminium
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[1] Baum M R. Rupture of a gas pressurized cylindrical vessel: The velocity of a detached end-cap[J]. Journal of Loss Prevention in the Process Industries, 1985, 8(3): 149-161. [2] Eckhoff R K. Dust explosions in the process industries[R]. Great Britain: Butterworth Heinemann, 2003. [3] Nagy J, Verakis C. Development and control of dust explosions[M]. New York: Marcel Dekker Inc, 1985. [4] Kauffman C W, Srinath S R, Tezok F I, et al. Turbulence and accelerating dust flame[C]//20th Symposium(International)on Combustion. Pittsburgh PA: The Combustion Institute, 1984: 1701-1708. [5] Jarosinski J, Lee J H, Knystautas R, et al. Quenching distance of self-propagation dust-air flamese[C]//Proceedings of 21st Symposium (International) on Combustion. Pittsburgh PA: The Combustion Institute, 1986: 1917-1924. [6] 王双峰, 浦以康, 贾复.一种低湍流扬尘方法的实验研究[J].工程热物理学报, 2006, 27(2): 347-350. doi: 10.3321/j.issn:0253-231X.2006.02.053Wang Shuang-feng, Pu Yi-kang, Jia Fu. Experimental investigation on a low turbulence dust dispersion method[J]. Journal of Engineering Thermophysics, 2006, 27(2): 347-350. doi: 10.3321/j.issn:0253-231X.2006.02.053 [7] Pu Y K. Fundamental characteristics of laminar and turbulent flames in cornstarch dust-air mixture[D]. Department of Mechanical Engineering, McGill University, 1988. [8] Tai C S, Kauffmann C W, Sichel M, et al. Turbulent dust combustion in a jet-stirred reactor[J]. Progress in Astronautics and Aeronautics, 1988, 113: 62-68. [9] Pu Y K, Li Y C, Kauffman C W, et al. Determination of turbulence parameters in closed explosion vessel[J]. Progress in Astronautics and Aeronautics, 1989, 132: 107-123. [10] Amyotte P R, Pegg M J. Lycopodium dust explosions in a hartmann bomb: Effects of turbulence[J]. Journal of Loss Prevention in the Process Industries, 1989, 2(2): 87-94. doi: 10.1016/0950-4230(89)80004-X [11] 李新光, 王健, 钟圣俊, 等.初始湍流对粉尘爆炸影响的实验研究[J].中国粉体技术, 2010, 16(5): 37-41.Li Xin-guang, Wang Jian, Zhong Sheng-jun, et al. Experimental investigation on influence of pre-ignition turbulence on dust explosion[J]. China Powder Science and Technology, 2010, 16(5): 37-41. [12] Nagy J, Verakis C H. Development and control of dust explosion[M]. UK: Marcel Dekker Inc, 1983. [13] Eckhoff R K. Dust explosions in the process industries[M]. US: Butterworth-Heinemann Ltd, 1991. [14] 胡俊, 浦以康, 万士昕.粉尘等容燃烧容器内扬尘系统诱导湍流特性的实验研究[J].实验力学, 2000, 15(3): 341-348. doi: 10.3969/j.issn.1001-4888.2000.03.015Hu Jun, Pu Yi-kang, Wan Shi-xin. Experimental investigation on dispersion-induced turbulence in closed explosion vessels[J]. Journal of Experimental Mechanics, 2000, 15(3): 341-348. doi: 10.3969/j.issn.1001-4888.2000.03.015 [15] Liu Q M, Bai C H, Li X D, et al. Coal dust/air explosions in a large-scale tube[J]. Fuel, 2010, 89: 329-335. doi: 10.1016/j.fuel.2009.07.010 [16] 尉存娟, 谭迎新, 路旭, 等.点火延迟时间对铝粉爆炸压力的影响研究[J].中北大学学报, 2009, 30(3): 257-260. doi: 10.3969/j.issn.1673-3193.2009.03.013Yu Cun-juan, Tan Ying-xin, Lu Xu, et al. Effect of the ignition delay time on the explosion pressure of aluminum dust[J]. Journal of North University of China, 2009, 30(3): 257-260. doi: 10.3969/j.issn.1673-3193.2009.03.013 [17] 袁旌杰, 伍毅, 陈瑜.点火延迟时间对粉尘最大爆炸压力测定影响的研究[J].中国安全科学学报, 2010, 20(3): 65-69. doi: 10.3969/j.issn.1003-3033.2010.03.012Yuan Jing-jie, Wu Yi, Chen Yu. Effect of ignition delay time on measurement of maximum explosion pressure of dusts[J]. China Safety Science Journal, 2010, 20(3): 65-69. doi: 10.3969/j.issn.1003-3033.2010.03.012 [18] Zhang Q, Li W, Lin D C. Influence of nitromethane concentration on ignition energy and explosion parameters in gaseous nitromethane/air mixtures[J]. Journal of Hazardous Matericals, 2010, 185(2): 756-762. [19] Cashdollar K L, Zlochower I A. Explosion temperatures and pressures of metals and other elemental dust clouds[J]. Journal of Loss Prevention in the Process Industries, 2007, 20(4/5/6): 337-348. [20] Dufaud O, TraoréM, Perrin L, et al. Thomas. Experimental investigation and modeling of aluminum dusts explosions in the 20Lsphere[J]. Journal of Loss Prevention in the Process Industries, 2010, 23(2): 226-236. doi: 10.1016/j.jlp.2009.07.019 -
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