部分切口杆状发射药内弹道性能的数值模拟

Numerical Simulation of the Interior Ballistic Performance for Partially Cut Multi-perforated Stick Propellants

为了研究部分切口杆状发射药的装药内弹道性能,基于经典内弹道理论建立了部分切口杆状发射药的装药内弹道计算模型,采用高能硝胺发射药配方的部分切口杆状发射药进行了装药内弹道性能计算,在30mm火炮上进行了试验验证,并分析了切距、切宽及切深对部分切口杆状发射药内弹道性能的影响。研究结果表明:采用建立的部分切口杆状发射药内弹道模型计算获得的最大膛压为430.2MPa,与试验测试的最大膛压平均值409.7MPa的计算误差为5.0%;计算的炮口初速为1378.2m·s^-1,与试验测试的炮口初速平均值1409.6m·s^-1的计算误差为2.2%;最大膛压和炮口初速随切距的增大而减小,切距从5mm增加至50mm,最大膛压降低了12.0%,初速降低了3.1%,且在切距值大于20mm后对膛压及初速的影响逐渐降低;最大膛压及炮口初速随切深和切宽数值的增加而增大,切深对最大膛压的影响相较对炮口初速的影响更为显著,切宽数值的变化对内弹道性能的影响总体较小。

To study the interior ballistic performance of charge for partially cut multi-perforated stick propellant,a interior ballistic simulation model of charge for partially cut multi-perforated stick propellant was established based on the classical interior ballistic theory. The calculation of interior ballistic performance of charge was performed using the partially cut multi-perforated stick propellant with high energy nitramine propellant formulations. The experimental validation were carried out on 30 mm artillery. The effect of incision intervals,incision web and incision depth on the interior ballistic performance of partially cut multi-perforated stick propellant was analyzed. The results show that the maximum bore pressure calculated by the established interior ballistic model of partially cut multi-perforated stick propellant is 430.2 MPa. The calculated error of the maximum bore pressure is 5.0% compared with average value of testing maximum bore pressure of 409.7 MPa. The calculated muzzle velocity is 1378.2 m ·s^-1,and the calculated error is 2.2% compared with average value of testing muzzle velocity of 1409.6 m ·s^-1. The maximum bore pressure and muzzle velocity decrease with the increase of incision intervals. When the incision intervals increase from 5 mm to 50 mm,the maximum bore pressure reduces by 12.0%. And the muzzle velocity reduces by 3.1%. The effect upon the interior ballistic performance is gradually reduced when the numerical value of incision intervals is greater than 20 mm. The value of maximum bore pressure and muzzle velocity increases with the increase of incision depth and incision web. The effect of incision depth upon the maximum bore pressure is more significant than that upon the muzzle velocity. The interior ballistic performance of the propellant is insensitive to the change of incision web 's value.