磁约束下等离子体在火炮身管中的隔热特性研究

Study of Thermal Insulation Characteristics of Plasma in the Gun Barrel Under Magnetic Confinement

针对武器身管烧蚀严重的问题,提出一种应用磁场控制等离子体减少火炮身管内膛表面烧蚀的方法。运用感应磁场法建立磁流体动力学模型,对磁场作用下导电气体在火炮身管中的流动以及传热特性进行了数值模拟,研究了不同磁场大小和等离子体电导率对壁面温度的影响。结果表明:外加磁场后,导电气体内感应生成的洛仑兹力可以抑制气体的湍流强度,削弱其传热能力,从而减少壁面的烧蚀。在磁场强度为2 T时,壁面温度比无磁场情况下减小22.6%,且随着等离子体电导率的增大,隔热效果逐渐提高。

In order to solve the problem of serious ablation of weapon tube,a method to reduce the ablation of gunpowder gas on the barrel bore surface with application of magnetron plasma was presented.A magnetic fluid dynamics model was established based on the induction magnetic field method.The flow and heat transfer characteristics of plasma in a cylindrical structure under magnetic field was simulated with the effects of different magnetic field strength and plasma conductivity on the wall temperature studied.The results show that the Lorentz force can suppress the turbulence intensity of the magnetic fluid under magnetic field and weaken the heat transfer capability results in effectively reducing the wall temperature.When the magnetic field intensity is 2 T,the wall temperature is reduced by 226%compared with the condition of no magnetic field.The heat insulation effect gradually improved with the increase of the plasma conductivity.