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以SPH方式模擬探討炸藥爆炸過程中之動態特性
Investigations on the Dynamic Characteristics of Detonation Processes by Using Smoothed Particle Hydrodynamics
摘要
無網格、自調性、拉格朗日型式之光滑粒子流體動力法（Smoothed Particle Hydrodynamics）被採用來模擬探討高能炸藥之爆炸動態表現。一維不同起爆點之爆炸場隨時間演變被求出，發現本數值與CJ理論所得之理論值具有極佳之相合性；在二維場，為探討炸藥間隙對特性場演變之影響，長條型炸藥與中間具間隔等量之炸藥，分別在同一側引爆，發現間隙有聚集高能粒子的效果，在引爆初期之引爆端與引爆後期之非引爆端，在間隙位置處出現壓力與內能之相對極大值，使間隙處流體迅速獲得動能趕上甚至超越原先領先噴岀之流體。另外，在引爆過程中與引爆完成後，驅動粒子運動之壓力場存在明顯的差異，造成此二階段粒子膨脹型態的差異，在引爆過程中大部分粒子往自由端膨脹運動，而引爆完成後粒子往四面八方運動。
並列摘要
Meshfree, adaptive and Lagrange-style smoothed particle hydrodynamics method was adopted to investigate the detonation processes of high explosives. The numerical results of one-dimensional cases were compared with analytical results based on classical C-J theory. Good consistence was found, thus the reliability of the present numerical model was proven. In the two-dimensional cases, detailed flow properties of slab explosives with and without leakage, were presented in the different explosive stages. During detonation processes, high explosives particles being gathered in leakage introduces a high energy density and high pressure region. Finally, the particles near by the region with high energy and high pressure will spread faster and form a jet. The pressure fields are definitely different in detonation and after detonation. After the detonation, the maximum pressure region is in the interior of flow and makes particles to expand without special direction. However, the maximum pressure region is close to the detonation wave and forces most particles to expand to stream-wise free edge during detonation.