固体电枢熔化波烧蚀的二维数值模拟  

Two-dimensional Numerical Simulation of Melt-wave Erosion in Solid Armatures

作　　者：巩飞[1] 翁春生[1] 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《南京理工大学学报》2012年第3期487-491,共5页Journal of Nanjing University of Science and Technology

基　　金：高等学校博士学科点专项科研基金(20093219110037)

摘　　要：为了准确地反映电磁轨道炮内电枢烧蚀的特性,建立了二维固体电枢熔化波烧蚀的计算模型。采用有限差分的交替方向隐式法进行耦合计算,得到了熔化波烧蚀的变化特性。计算结果表明,烧蚀的驱动机制为速度趋肤效应,电流集中在电枢与导轨接触面的尾部边缘,使电枢焦耳热剧增导致出现烧蚀。熔化波从电枢尾部向头部推进,当传至电枢头部时,可能引发电枢转捩。In order to reflect armature erosion characteristics in railguns exactly, a computational model of melt-wave erosion in two-dimensional solid armatures is developed. The variation characteristics of meh-wave erosion are obtained adopting coupling calculations by using the Peaceman-Rachford （P-R）format of the finite difference method. The calculation results show that： the driving mechanism of erosion is the velocity skin effect, a concentration of current is at the rear edge of the rail-armature interface, and the erosion occurs due to the joule heating. The melt-wave moves from the back to the front of the armature. It is possible to cause an armature transition when the melt-wave reaches the front of the armature.

关 键 词：电磁轨道炮 固体电枢 熔化波 烧蚀 有限差分法 

分 类 号：O442[理学—电磁学]