Development of in-house high-resolution hydrocode for assessment of blast waves and its application
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摘要:
目的 当爆炸发生在约束空间内部，由于壁面的约束限制，爆炸冲击波的传播和演化特性将更加复杂，其对结构、内部设施及人员的损伤也更加严重。为了研究约束空间内部的爆炸特性， 方法 基于FORTRAN平台，采用三阶WENO有限差分格式，自主开发约束空间内部爆炸波高精度三维数值计算程序。利用Sod激波管、双爆轰波碰撞、空中爆炸等经典算例，验证所开发程序的可靠性。基于验证的程序，开展约束空间内部爆炸波数值计算，研究密闭空间、泄压空间及连通空间内部的爆炸波传播规律与爆炸载荷特性。 结果 研究表明，所开发的程序能较好地模拟约束空间内的爆炸过程。 结论 该开发工作可为后续研究复杂空间内部爆炸波传播路径、评估爆炸载荷以及合理设计抗爆结构奠定基础。 Abstract: The propagation and evolution characteristics of blast waves in confined spaces are complicated due to the constraint of the surrounding walls, by which the enhanced reflected shock waves will cause more serious damage to the internal structures, facilities and personnel. In order to investigate the characteristics of explosions in confined spaces, an in-house high-resolution hydrocode was developed in this present work. The third-order WENO finite difference scheme (weighted essentially non-oscillation scheme) was implemented in the code to capture the shock waves generated by cylindrical explosives. The Sod shock tube problem, interacting blast wave problem and blast in air problem were simulated to validate the code. The validated code was then used to simulate the blast waves generated by condensed explosives in closed, vented and connected spaces. The propagation of blast waves and the characteristics of blast load were subsequently investigated. The developed code appears to accurately predict the process of explosions in confined spaces. This high-resolution hydrocode can be used to study the propagation paths of blast waves in complicated spaces and evaluate the internal blast load, which can provide reliable input for the design of explosion-resistant structures. -
图 1 Sod激波管算例计算的压力曲线
Figure 1. Pressure curves calculated by the case of the sod shock tube
图 2 双爆轰波碰撞算例计算的压力曲线
Figure 2. Pressure curves calculated by the case of the interacting blast wave
图 3 典型位置处的空中爆炸压力时间历程对比
Figure 3. Comparisons of pressure time history of blast in air at typical locations
图 4 密闭空间及测点分布示意图
Figure 4. Schematic diagram of closed space and arrangement of measuring points
图 5 密闭空间内部的爆炸初始条件及网格分布
Figure 5. Initial conditions and mesh distribution in closed space
图 7 密闭空间内部的爆炸载荷时间历程曲线图
Figure 7. Time histories of blast load at the gauging points in closed space
图 8 泄压空间及测点分布示意图
Figure 8. Schematic diagram of venting space and arrangement of measuring points
图 11 泄压空间内部的爆炸载荷时间历程曲线
Figure 11. Time histories of blast load at the gauging points in venting space
图 13 不同泄压口位置测点3爆炸载荷时间历程曲线
Figure 13. Time histories of blast load at gauging point 3 for different positions of venting hole
图 14 不同泄压口边长测点3爆炸载荷时间历程曲线
Figure 14. Time histories of blast load at point 3 for different sizes of venting holes
图 15 连通空间及测点分布示意图
Figure 15. Schematic diagram of connected space and arrangement of measuring points
图 16 连通空间内爆炸初始条件及网格分布
Figure 16. Initial condition and mesh distribution in connected space
图 17 连通空间内爆炸初期压力分布云图
Figure 17. Pressure distribution at early stage in connected space
图 18 左约束空间内爆炸壁面测点1，2爆炸载荷时间历程曲线
Figure 18. Time histories of blast load at gauging point 1 and 2 in the left confined space
图 19 右约束空间内爆炸壁面测点爆炸载荷时间历程曲线
Figure 19. Time histories of blast load at gauging point 3, 4 in the right confined space
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