摘要
圆柱形炸药空爆后在近场空间会形成强度不均匀的超压场,在相同等效衰减距离、不同空间角度上的近场超压可相差数倍甚至一个量级以上.为了准确、快速地评估圆柱空爆近场超压强度及分布差异给近场不同区域毁伤效应和防护效果带来的影响,在圆柱空爆近场实验数据匮乏的情况下使用经过实验效验的模拟数据来补足样本空间,通过数据拟合的方式给出了圆柱装药空爆在较小等效衰减距离下的超压估算公式.首先,通过与球形装药下的经验公式和圆柱装药下的实验结果对比,分别验证了模拟结果在球形和圆柱装药情况下均具有一定置信度;之后,以二次多项式的形式拟合得到了圆柱空爆近场超压估算公式,并给出了6种不同长径比圆柱空爆在不同空间位置上超压的实验结果与估算公式结果的对比.结果表明,估算公式可在较小误差范围内给出炸药空爆在近场空间任意位置上的超压,其经实验校验具有一定置信度的适用范围是圆柱长径比为1/4~4、等效衰减距离为0.2~2.0 m/kg^(1/3).
After cylindrical charge air blast, an uneven overpressure field is formed in the near-field space. The near-field overpressure at the same equivalent attenuation distance and different angles can differ by several times or even more than one order of magnitude. The use of spherical charge overpressure model in the near field of cylindrical charge air blast will bring great error, so it is necessary to develop a cylindrical charge overpressure model with near-field description ability. Because of the insufficient experimental data, a quick estimation method was proposed to analyze the effect of intensity and distributing of near-field overpressure in cylindrical charges air blast on the area damage and safety. Based on simulated data fitting, an estimation equation of overpressure was developed for cylindrical charge air blast in less equivalent attenuation distance. First, compared with the experience equation of the spherical TNT charge and the experiment results of cylindrical charge, the believable degree of the simulation results was validated respectively for spherical charge and cylindrical charge.Then, based on quadratic polynomial fitting, an estimation equation of near-field overpressure was obtained for cylindrical charge air blast. And the cylindrical charge air blast simulations with different length-diameter ratios were carried out. Finally, the simulation results of the near-field overpressure of cylindrical charge air blast with 6 different length-diameter ratios were compared with their experimental results. The results show that the estimation equation can be used to estimate the overpressure with less error range for cylindrical charge air blast at any position in near-field space. According to preliminary experimental verification, its suitable application range is that the range of cylinder length-diameter ratio is 0.2~2.0 m/kg^(1/3).
作者
刘军
王政
熊俊
殷建伟
LIU Jun;WANG Zheng;XIONG Jun;YIN Jianwei(Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2022年第9期918-927,共10页
Transactions of Beijing Institute of Technology
基金
于敏基金资助项目(TCYM1820-02)
国家自然科学基金资助项目(12101062)。
关键词
圆柱装药
炸药空爆
近场超压
估算公式
cylindrical charge
air blast
overpressure
estimation equation
