无反射边界条件对空中爆炸超压峰值影响范围研究

选取合理的模型和状态方程参数,利用有限元软件LS-DYNA计算空中爆炸超压峰值,将数值模拟结果与实验结果和经验公式进行对比,证明参数选择的合理性并验证数值模拟的精度.通过控制参数,选择不同的比例距离,研究无反射边界条件对TNT空中爆炸峰值超压的影响,结果表明,无反射边界附近一定范围内的超压峰值会受到影响;建模区域的比例距离超出考查范围一定区域可减弱无反射边界条件对超压峰值的影响.

Research on peak over-pressure of blast in air influenced by non-reflect boundary

FEM program LS-DYNA is used to simulate the spread of blast wave in air, with appropriate modeling and EOS parameters. Comparing among results of simulation, experiments and experience equations, the rationality ofparamet-ers and precision of numerical simulation are proved. By controlling the parameters and choosing different scaled distances, research on peak over-pressure of blast in air by non-reflect boundary is conducted. Results show that peak over-pressure is effected in scaled distances near the non-reflect boundary; the scaled distances of the model should be longer than testingdis-tances in order to decrease the impact of non-reflect boundary on peak over-pressure.