聚能炸藥金屬射流形成過程數值模擬探討—基於SPH方法

Numerical Simulation on the Formation of Metal Jet of Shaped Charge-Based on SPH

許掙強(Cheng-Chiang Hsu)

《航空太空及民航學刊.系列B》 44卷2期 (2012/12) Pp. 75-82

https://doi.org/10.6124/12-0430-693

摘要

本文建立具多相流模擬能力的光滑粒子流體動力數值模式，並用來模擬聚能炸藥金屬射流的形成過程，成功捕捉氣固交互作用與金屬罩塑性變形的動態變化過程。金屬射流形成過程中的氣態爆炸產物的壓力場、密度場、速度場及聚能炸藥金屬罩隨時間的演變均被求出。由研究中發現當爆轟波衝擊金屬藥罩時，會往上游傳遞反射壓縮波，擠壓氣體物質往起爆端噴送，並將氣態產物往上下兩側噴送，造成爆炸氣態產物在下游分部比上游寬的情形；氣態產物的壓力能及動能，藉氣態粒子與金屬罩粒子的接觸傳遞，進而推擠金屬粒子而由頂角處射出形成射流，氣態產物的能量在爆轟波掃過金屬藥罩時，就幾乎全部傳入金屬藥罩，因此射流型態隨時間的演變主要受高含能金屬粒子慣性與粒子間交互作用所主導。

關鍵字

光滑流體動力粒子法 ； 多相流 ； 聚能炸藥 ； 金屬射流

並列摘要

A numerical model based on Smoothed Particle Hydrodynamics was developed to simulate the formation of metal jet of shaped charge. The present numerical model successfully catches the gas-solid interactions and dynamic evolutions of metal liner of shaped charge. During the formation of metal jet, temporal evolutions of density fields, pressure fields and velocity fields of explosive gaseous products were carefully studied to conceive the mechanism that dominate the formation of metal jet. As detonation wave impacts the metal liner, compressible wave reflects upstream and supplies the upstream gaseous products with additional negative momentum. Gaseous product also expands along the two sides of metal liner. Thus, gaseous product spreads more widely in the downstream than in the upstream. The energy transformation between metal particles of the liner and gaseous explosive product occurs in a very short instance, as the detonation wave passes through the liner. Therefore, after the detonation wave the formation of metal jet of shaped charge is mainly dominated by the initial of highly energetic metal particles and interplays between them.

並列關鍵字

Smoothed particle hydrodynamics ； Multiphase flow ； Shaped charge ； Metal jet

參考文獻

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