泄爆诱导的湍流、旋涡和外部爆炸

姜孝海; 范宝春; 叶经方

泄爆诱导的湍流、旋涡和外部爆炸

南京理工大学动力学院,南京 210094

基金项目: 国家重点基础研究专项经费资助(2001CB409600);国家自然科学基金资助项目(19832030)

详细信息

作者简介:
姜孝海(1975- ),男,湖北人,博士(E-mail:xhjiang988@yahoo.com.cn);范宝春(1945- ),男,江苏人,教授,博士生导师(联系人.Tel:+86-25-84315493;Fax:+86-25-84315962;E-mail:bcfan@mail.njust.edu.cn).

中图分类号: O389；X932
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出版历程
- 收稿日期: 2003-01-13
- 修回日期: 2004-06-29
- 刊出日期: 2004-12-15

Turbulence, Vortex and External Explosion Induced by Venting

College of Dynamics, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

摘要

摘要: 基于k-ε湍流模型和Eddy-dissipation燃烧模型，采用同位网格SIMPLE算法，对充满甲烷-氧气预混气的带导管柱形泄爆容器向空气中泄爆的情形进行了数值模拟．根据计算结果，分析了泄爆后外流场中可燃云团、火焰和压力的变化过程．结果表明，外部爆炸是因射流火焰点燃高压区中的可燃云团，从而引起的剧烈湍流燃烧所致．同时还讨论了外流场湍流和涡量的分布特征．射流火焰进入外部可燃云团后，湍流主要分布在平均动能梯度较大的区域，而不在火焰阵面上．涡量分布主要受斜压效应的影响，在压力和密度梯度斜交区域，其值较大．
- 爆炸 /
- 泄爆 /
- 外部爆炸
Abstract: The process of explosion venting to air in a cylindrical vent vessel connected to a duct,filling with a stoichiometric methane-oxygen gas mixture,was simulated numerically by using a colocated grid SIMPLE scheme based on k-epsilon turbulent model and Eddy-dissipation combustion model. The characteristics of the combustible cloud,flame and pressure distribution in the external flow field during venting were analyzed in terms of the predicted results.The results show that the external explosion is generated due to violent turbulent combustion in the high pressure region within the external combustible cloud ignited by a jet flame.And the turbulence and vortex in the external flow field were also discussed in detail.After the jet flame penetrating into the external combustible cloud,the turbulent intensity is greater in the regions with greater average kinetic energy gradient,rather than in the flame front;and the vortex in the external flow field is generated primarily due to the baroclinic effect,which is greater in the regions where the pressure and density gradients are nearly perpendicular.
- explosion /
- vented explosion /
- external explosion

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参考文献(7)

[1]	Mccann D P J, Thomas G O, Edwards D H. Gasdynamics of vented explosions—Part I:Experimental studies[J].Combustion and Flame,1985,59(3):233—250. doi: 10.1016/0010-2180(85)90128-2
[2]	Cooper M G, Fairweather M, Tite J P. On the mechanisms of pressure generation in vented explosions[J].Combustion and Flame,1986,65(1):1—14. doi: 10.1016/0010-2180(86)90067-2
[3]	Ponizy B, Leyer J C. Flame dynamics in a vented vessel connected to a duct—1:Mechanism of vessel-duct interaction[J].Combustion and Flame,1999,116(2):259—271. doi: 10.1016/S0010-2180(98)00038-8
[4]	Catlin C A. Scale effects on the external combustion caused by venting of a confined explosion[J].Combustion and Flame,1991,83(4):399—411. doi: 10.1016/0010-2180(91)90086-Q
[5]	Hjertager B H. Simulation of transient compressible turbulent reactive flows[J].Combustion Science and Technology,1982,27(5):159—170. doi: 10.1080/00102208208946985
[6]	陶文铨.计算传热学的近代进展[M].北京:科学出版社,2000,181—186.
[7]	王继海.二维非定常流和激波[M].北京:科学出版社,1994,348—383.

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泄爆诱导的湍流、旋涡和外部爆炸

作者简介:
姜孝海(1975- ),男,湖北人,博士(E-mail:xhjiang988@yahoo.com.cn);范宝春(1945- ),男,江苏人,教授,博士生导师(联系人.Tel:+86-25-84315493;Fax:+86-25-84315962;E-mail:bcfan@mail.njust.edu.cn).

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Turbulence, Vortex and External Explosion Induced by Venting

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泄爆诱导的湍流、旋涡和外部爆炸

作者简介: 姜孝海(1975- ),男,湖北人,博士(E-mail:xhjiang988@yahoo.com.cn);范宝春(1945- ),男,江苏人,教授,博士生导师(联系人.Tel:+86-25-84315493;Fax:+86-25-84315962;E-mail:bcfan@mail.njust.edu.cn).

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出版历程

Turbulence, Vortex and External Explosion Induced by Venting

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出版历程

目录

作者简介:
姜孝海(1975- ),男,湖北人,博士(E-mail:xhjiang988@yahoo.com.cn);范宝春(1945- ),男,江苏人,教授,博士生导师(联系人.Tel:+86-25-84315493;Fax:+86-25-84315962;E-mail:bcfan@mail.njust.edu.cn).