| 刘军,秦承森,王裴.金属射流发散性理论分析及数值模拟[J].计算力学学报,2014,31(1):96~102 |
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| 金属射流发散性理论分析及数值模拟 |
| The theoretical analysis and numerical simulation of the metal jet incoherence |
| 投稿时间：2012-08-23 修订日期：2012-11-26 |
| DOI：10.7511/jslx201401017 |
| 中文关键词: 金属射流 射流发散 分叉射流 空洞射流 |
| 英文关键词:metal jet jet incoherence bifurcated jet hollow jet |
| 基金项目:国家自然科学基金（11072040）；中物院发展基金（2012B0202029）；国家青年科学基金（10902017）资助项目. |
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| 中文摘要: |
| 分析经典射流理论和相关文献，给出了在汇聚点坐标系中金属Cu对碰形成射流的汇聚射流区、无射流激波封锁区、无射流强度封锁区和形成发散射流区域。对金属超声速射流形成的发散性问题进行了理论分析，诠释了Walker基于实验提出射流发散理论，证明了金属射流超声速部分可形成发散射流也可形成汇聚射流，且超过1.23倍体声速的金属射流必定是发散的。最后，应用自编的欧拉计算程序MEPH对金属Cu以不同速度、倾角对碰射流形成过程进行数值模拟，得到了分叉射流、空洞射流和密实稀疏射流等的典型射流发散模式图像，印证了理论分析的结果。 |
| 英文摘要: |
| By the analysis of the classic jet theory and literature,the regions of no-jet,convergent jet and incoherent jet are given by calculation of copper in convergent point coordinate system.Theoretical analysis on the incoherence problem of metal supersonic jet formation explains Walker's experiment proposed jet incoherence theory,and proves that the supersonic portion of the metal jet can form an incoherence jet,but convergence jet may also be formed.When the collision velocity is more than 1.23 times the speed of the body-sound,the metal jet must be incoherent.At last the numerical simulation of the copper jet formation process at different speeds and angles is done using ourselves Euler calculation program "MEPH".The typical images of bifurcated jet,hollow jet and dense rarefaction jet are given by calculations to confirm the theoretical analysis results. |
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