激光作用铝靶爆轰波流场观测与理论分析 |
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引用本文: | 王飞,陈朗,伍俊英,孙崔源.激光作用铝靶爆轰波流场观测与理论分析[J].强激光与粒子束,2013,25(4):807-812. |
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作者姓名: | 王飞 陈朗 伍俊英 孙崔源 |
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作者单位: | 1.北京理工大学 爆炸科学与技术国家重点实验室, 北京 1 00081 |
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摘 要: | 进行了强激光作用铝靶实验,采用纹影照相法,观察爆轰波流场演化过程,分析了爆轰波衰减规律。根据冲击波运动的自相似性,采用点爆炸模型描述了激光作用下爆轰波流场的演化,计算了波阵面速度、压力和温度。结果显示:爆轰波阵面沿迎着激光光源方向较快传播,波阵面形状由最初的半椭球形逐渐向半球形转变,在演化过程中扰动区结构复杂,存在多个密度间断层。在爆轰波开始传播阶段,波阵面的压力和温度较高但下降很快。
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关 键 词: | 爆轰波 纹影照相法 点爆炸 流场演化 |
收稿时间: | 2012-09-02 |
Experimental observation and theoretical analysis of detonation wave evolution induced by laser ablating aluminum target |
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Affiliation: | 1.State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China |
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Abstract: | A experiment of laser ablating aluminum target was conducted. A schlieren photography technique was employed for visualizing temporal evolution of detonation waves and analyzing detonation wave attenuation law. Based on similitude theory of shockwave motion, a point explosion model was used to describe detonation-wave evolution induced by laser ablating aluminum target. The propagation speed, pressure and temperature of the wave front were calculated. The results show that the detonation wave has a high speed towards laser source. The wave front transform from half-elliptical in early evolution stage into half-spherical. The disturbed zone has a complicated structure and multi-density discontinuities during the flow-field evolution. In the initial stage of detonation-wave propagation, the shockwave has a high pressure and temperature, but they decrease rapidly. |
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