Numerical Simulation of Influence of Different Modes of Initiation on the Forming of Radial Shaped Jet
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摘要: 采用LS-DYNA有限元分析软件, 对环向聚能装药在中心点起爆、端点起爆和两端对称起爆方式下的射流形成过程分别进行了数值模拟。计算结果表明:3种起爆方式下,两端对称起爆的射流头部速度最高,中心点起爆次之,端点起爆最小。起爆方式的不同, 导致爆轰波阵面与药型罩母线的夹角不同;而夹角越小,罩微元受到的爆轰载荷越大,相应的压垮速度越高,形成的射流头部速度越大。在端点起爆的情况下,由于爆轰波形关于药型罩不对称,导致两侧罩微元的爆轰载荷和压垮速度不同,射流发生偏移。Abstract: The formation processes of the radial shaped charge jet with different modes of initiation—center-point initiation, endpoint initiation and two-side symmetric initiation—were simulated using LS-DYNA finite element code.Our calculated results show that, comparatively speaking, the head velocity of the jet produced by two-side symmetric initiation is the highest, and that by center-point initiation takes the second place, while that by endpoint initiation is the lowest.Different initiation modes result in different angles between the detonation wave and the generatrix of the outside liner, and the smaller the angle, the higher the detontion load and collapse velocity, and the better the jet performaces.Meanwhile, under the circumstances of endpoint initiation, the detonation load and collapse velocity of the liner elements of both sides are different due to the liner asymmetry of detonation wave, which results in jet offset.
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Key words:
- radial shaped jet /
- numerical simulation /
- modes of initiation /
- shaped charge liner
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Explosive A/(GPa) B/(GPa) R1 R2 ω (ρ0e)/(GPa) RDX 581.4 6.8 4.1 1.0 0.35 9.0 Material c/(m/s) S1 S2 S3 γ0 a Copper 3 940 1.49 0.0 0.0 2.02 0.47 表 3 起爆后10.0 μs时,3种不同起爆方式所对应的射流速度
Table 3. Velocity of jet at 10.0 μs after initiation with 3 different modes of initiation
Modes of Initiation Head velocity of jet/(m/s) Slug velocity/(m/s) Center-point initiation 1 980 387 Endpoint initiation 1 862 380 Two-side symmetric initiation 2 225 392 -
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