方形爆炸抛撒装置结构优化

为了研究方形抛撒装置壳体破坏规律及燃料分散特性,开展了抛撒装置外场实验并利用LS-DYNA仿真软件进行了数值模拟,模拟结果与实验结果相吻合。进一步分析装置倒圆角及刻槽深度对壳体破裂效果及燃料分散速度的影响规律,结果表明:倒圆角与增加刻槽深度有利于减小壳体棱边处应力集中的影响,圆角半径增至10 mm或刻槽深度增至1.2 mm时,棱边处不再破裂;同一装置壳体边部和中部位置采用不同深度的刻槽可有效减少壳体破裂不均现象。当边缘处刻槽深度为1.2 mm、中间刻槽为1.6 mm时,壳体均匀破裂;当棱边处倒10 mm圆角,边部刻槽深度为0.8 mm,中部刻槽为1.2 mm时,抛撒装置既能满足壳体均匀开裂,又可提高壳体强度,同时可将燃料分散平均速度差值降低22%,从而有效提高燃料抛撒效率。

Structure Optimization of Square Explosive Dispersion Device

This paper presents a numerical model of the square dispersing device for simulating the process of shell failure and fuel dispersion by LS-DYNA software.Combined with the results of the field experiments,this model reveals in detail the influence of the fillet angle and groove depth on the shell rupture process and fuel dispersion speed.The results show that the shell edge would no longer rupture when the fillet radius increases to 10 mm or the groove depth increases to 1.2 mm,since different groove depth would effectively reduce the nonuniform shell rupture.And when the depth of edge and middle groove is 1.2 mm and 1.6 mm respectively,the shell is uniformly ruptured.In addition,a special dispersing device with 10 mm fillet angle,0.8 mm edge groove depth and 1.2 mm middle groove depth,could not only make the shell uniformly ruptured,but also increase the strength of the shell.Meanwhile,it would reduce the average velocity difference of fuel dispersion by 22%,which effectively improve the fuel dispersing efficiency.