爆炸近区流场的数值模拟方法研究

doi:10.3969/j.issn.1000-1093.2012.05.010

兵工学报 ›› 2012, Vol. 33 ›› Issue (5): 566-573.doi: 10.3969/j.issn.1000-1093.2012.05.010

爆炸近区流场的数值模拟方法研究

徐春光¹，白晓征²，刘瑜¹，刘君³

(1.国防科学技术大学航天与材料工程学院，湖南长沙 410073; 2.中国人民解放军总参谋部陆航研究所，北京 101121;3. 大连理工大学航空航天学院，辽宁大连 116024)

收稿日期:2010-09-21 修回日期:2010-09-21 上线日期:2014-03-04
作者简介:徐春光(1977—)，男，博士研究生
基金资助:
“973”基金项目（2009CB723802）

Research on Numerical Simulation Method of Near-field Flows in Air Blast

XU Chun-guang¹， BAI Xiao-zheng ²， LIU Yu ¹， LIU Jun ³

(1.College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, Hunan, China;2.Army Aviation Research Institute, General Staff of PLA, Beijing 101121, China;3.School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, Liaoning, China)

Received:2010-09-21 Revised:2010-09-21 Online:2014-03-04

摘要/Abstract

摘要： 提出了一种用于模拟爆炸近区炸药、爆轰产物、空气等相互作用流场的数值方法。在欧拉型方法中引入了一种炸药、爆轰产物、空气3种组分的混合模型，该模型中炸药及爆轰产物采用Jones-Wilkins-Lee(JWL)状态方程，空气采用理想气体状态方程，在固相与气相间满足等压假设和体积可加性，气相组分间满足等温假设和分压定理。该模型无需迭代求解，计算效率较高。化学反应率采用“点火—生长”模型，采用AUSM₊-up格式计算通量。计算了空气中球形TNT装药的爆炸问题，可以清晰地看到爆轰波在流体界面上发生的透射、反射等一系列复杂作用过程。计算得到的超压峰值在直至距药球表面5 cm的位置都与实验结果符合良好，冲击波到达时间、超压比冲量等与现有实验结果也符合较好，验证了本方法的有效性和准确度。

关键词: 爆炸力学, 凝聚态炸药, 欧拉型方法, 爆炸近区, 空中爆炸

Abstract: A new method of simulating the explosion flowfield due to the interaction of explosives, detonation products and air was proposed. A mixing model of explosives, detonation products and air was introduced in Eulerian method. In this model, Jones-Wilkins-Lee(JWL) state equation was used for the explosives and products, while a prefect gas state equation was used for air; an equilibrium pressure assumption was made between explosives and products, while an equilibrium temperature assumption was made between products and air; no iteration is required in this model, so a high efficiency is achieved. An ignition and growth model was used to calculate the chemical reactivity, and AUSM₊-up scheme was used to calculate the convection flux. The explosion of spherical TNT explosives in air was calculated, and a series of complex interactions, such as transmission and reflection, between detonation wave and fluid interface were observed. The calculated peak over-pressure accords well with experimental results even at 5 cm from the explosive surface. The arriving time of blast wave and the specific impulse of overpressure also accord well with the existing experimental results, which validates the availability and accuracy of the method.

Key words: mechanics of explosion, condensed explosive, Eulerian method, near-field, air blast

中图分类号:

O381

徐春光，白晓征，刘瑜，刘君. 爆炸近区流场的数值模拟方法研究[J]. 兵工学报, 2012, 33(5): 566-573.

XU Chun-guang， BAI Xiao-zheng ， LIU Yu ， LIU Jun. Research on Numerical Simulation Method of Near-field Flows in Air Blast[J]. Acta Armamentarii, 2012, 33(5): 566-573.

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爆炸近区流场的数值模拟方法研究

Research on Numerical Simulation Method of Near-field Flows in Air Blast

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