平面型增强轨道层数对电枢受力影响分析

Influence Analysis of Rail Layer Number of Planar Augmented Railgun on Armature Force

电磁轨道的放电烧蚀对发射装置的发射效率和寿命产生重要影响。平面增强轨道能显著增加电感梯度和减小电流,进而能够减小导轨的放电烧蚀。应用ANSYS Maxwell电磁场数值仿真软件,建立了三维电磁发射装置模型。分析了多层轨道在脉冲整形电流激励下,各个轨道在电流最大时刻,电枢纵向对称面和横截面上电磁场和电流密度分布规律。对比了各层轨道中电枢发射方向受力随时间的演化规律和电枢承受的冲量,确定出双层导轨具有更优异的性能。

Discharge and ablation between the rails and the armature have an important influence on the launching accuracy and launching efficiency of the electromagnetic rail launcher. The planar augmented rails can enhance inductance gradient and reduce current,furthermore can decrease the ablation. Three dimensional electromagnetic rail launcher model is established in ANSYS Maxwell. The evolution law of current density distribution and electromagnetic field in the longitudinal symmetric plane and cross section of multi-layer rails structure subjected to pulse shaping circuit is analyzed. The influence law of force change with time and the impulse of armature of multi layer rails are compared,the results reveal that the two layer augmented rail achieve better performance.