Computational Design of Graded Density Impactors for Convergent Hypervelocity Launchers
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摘要: 在利用汇聚型超高速发射装置进行超高压条件下物质状态方程测量时，二级飞片需要具有平面性好、击靶速度高的特点。为此采用具有自主知识产权的多介质流体高精度欧拉并行计算程序HVL-MFPPM，对汇聚型超高速发射装置进行了数值模拟，优化设计了一级飞片93W层的结构。计算结果表明：当采用最优设计方案时(93W层的直径为20 mm，厚度为1.8 mm)，一级飞片能够将克级的二级飞片加速到14 km/s以上；同时，这种设计可以提高速度增益和汇聚效果，并大幅度地改善二级飞片在发射管出口处的平面性。Abstract: When the convergent hypervelocity launcher is applied to measure the equation of states, the second stage flyer are required to have well impact planarity and high impact velocity. Taking this into consideration, our paralleled Eulerian code HVL-MFPPM is employed to investigate the hypervelocity launcher.According to the simulation results, the structure and dimensions of the first stage flyer are optimized.Finally, the best scheme (the diameter of the first stage flyer is 20 mm, and its thickness is 1.8 mm) is obtained, which leads to the successful launch of an intact gram magnitude tantalum flyer to a velocity over 14 km/s in numerical simulation, and significant improvements in the impact velocity and planarity of the second stage flyer.
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Key words:
- multi-fluid /
- hypervelocity launch /
- high resolution algorithm
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图 1 1.4 μs时二级飞片的A、B、C点和平面性参数
Figure 1. The A、B、C positions and planarity parameter of the second stage flyer at 1.4 μs
图 2 二级飞片上A、B、C 3点的速度变化曲线
Figure 2. The velocity history of A、B、C positions on the second stage flyer
图 3 Model 25-1.2和Model 22-1.6二级飞片在不同时刻的密度分布图
Figure 3. Density distributions of the second flyer at certain times for Model 25-1.2 and Model 22-1.6
图 4 Model 25-1.2和Model 22-1.6二级飞片的变形过程
Figure 4. Deformation processes of the second stage flyer for Model 25-1.2 and Model 22-1.6
图 5 计算模型一级飞片相对于初始模型的质量变化量
Figure 5. Mass of the first stage flyer for computation models in comparison with Model 25-1.2
图 6 二级飞片自由面中心速度和速度增益随93W层直径的变化
Figure 6. Free surface velocity and velocity gain of the second stage flyer versus the diameter of 93W layer
图 7 二级飞片平面性参数随93W层直径的变化
Figure 7. Planarity parameter varies with the diameter of 93W layer
图 8 Model 20-1.8二级飞片在不同时刻的密度图
Figure 8. Density distributions of the second stage flyer at certain times for Model 20-1.8
表 1 各模型参数和计算结果比较
Table 1. Parameters and calculated results of different computation models
Diameter of
93W/(mm)Thickness of combined
layers/(mm)Mass variation of the
1st stage flyer/(g)Velocity of the 2nd
stage flyer/(g)Velocity
gainδ/(mm) 15 1.7 -0.325 14.07 2.07 -0.200 15 2.0 1.451 14.52 2.14 -0.141 18 1.6 0.167 14.17 2.08 -0.204 18 1.8 1.486 14.68 2.16 -0.136 
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