电磁轨道发射装置截面形状对发射性能影响

Influence of Section Shape of Electromagnetic Rail Launcher on Emission Performance

为了更好的比较不同导轨截面形状对电磁轨道发射装置性能的影响,设计了相同截面面积的凸形,凹形和矩形截面导轨,通过涡流场计算确定出相同电感梯度下的三个截面模型尺寸。进一步对三种截面形状导轨发射装置模型进行了系统的瞬态场有限元分析。得到不同截面形状导轨模型在瞬态场下的电枢所受洛伦兹力与导轨最大电流密度随时间的演化规律,结果表明在相同电感梯度下改变导轨的截面形状并没有显著增强洛伦兹力与电枢所受冲量,但凸面导轨的最大电流密度是平面的1.59倍。

In order to compare the effect different rail cross section shape on the performance of electromagnetic rail launcher,the size of three kinds of cross section shapes rails are determined by the eddy current field calculation through designing of the same cross-sectional area of the convex,concave and rectangular section rail. Furteurmore the three kinds cross section shapes rails are analysed by using transient electric field simulation. The evolution of the Lorenz force and the maximum current density with different cross section shapes is obtained by the transient field calculation. The results shows that the change of the cross section shape does not significantly enhance the Lorenz force and the impulse of the armature,but the maximum current density of convex rails are 1. 59 times that of flat rails.