中文摘要：

为了分析增强型电磁轨道发射器的电磁场分布和电感梯度的影响因素，介绍了增强型电磁轨道发射器的基本原理，建立了2对导轨结构的增强型电磁轨道发射器的3维电磁场仿真模型，利用ANSOFT电磁场有限元分析软件对不同几何参数轨道炮的电磁场进行了仿真，给出了不同条件下的磁场和电流密度分布图，对其电感梯度进行了计算，并总结了几何参数对电感梯度的影响规律。仿真结果表明，在综合考虑导轨的机械和热承受能力的前提下，增强型电磁轨道发射器的内外导轨间距越小，电感梯度越大；导轨的厚度越小，电感梯度越大。与单对结构相比，该结构能够提高轨道电磁发射器的电感梯度1倍以上。

英文摘要：

In order to reveal the key structural parameters influencing the electromagnetic field distribution and induc- tance gradient for augmented railguns （AR）, we demonstrated the basic principle of AR, and established 3-D models of ARs with two pairs and three pairs of rails in ANSOFT. With the models, we calculated the electromagnetic field in some ARs with different structural parameters, and obtained the flux distribution and current density distribution. We also cal- culated the inductance gradient of the ARs, and summarized the influences of structural parameters on inductance gradient of AR. The results show that, after taking the mechanic force and heat withstanding capability of rails into consideration, reducing the distance between inner rail and outer rails and/or reducing the cross-section area of rails can increase the in- ductance gradient of an AR. Compared with conventional one-rail-pair railgtms, the augmented structure can improve the inductance gradient of railgun by more than one time.