CAJ | 학술논문

为探讨电磁发射过程中出现的热烧蚀现象，构建了电磁发射及电接触层接触电阻的模型，推导出电-磁-热场耦合方程，采用有限元数值计算方法得到了在脉冲电流激励下，轨道和电枢间电流密度、磁感应强度及温度的分布图。计算过程表明：电磁发射过程实际是电-磁-热场的耦合过程，接触电阻是造成电磁发射热损耗的主要原因之一，接触电阻使得轨道和电枢接触表面区域的电流密度极大，容易造成轨道材料的烧蚀。
위탐토전자발사과정중출현적열소식현상，구건료전자발사급전접촉층접촉전조적모형，추도출전-자-열장우합방정，채용유한원수치계산방법득도료재맥충전류격려하，궤도화전추간전류밀도、자감응강도급온도적분포도。계산과정표명：전자발사과정실제시전-자-열장적우합과정，접촉전조시조성전자발사열손모적주요원인지일，접촉전조사득궤도화전추접촉표면구역적전류밀도겁대，용역조성궤도재료적소식。
For exploring the thermal ablation phenomenon in electromagnetic emission,the models of electromagnetic emission and electrical contact resistance contact layer is constructed,electric -magnetic - thermal field coupled equations is deduced,using finite element numerical method to gain the current density and the magnetic flux density and temperature distributing profile between the rail and armature. Calculations show that electromagnetic emission process is actually electric - magnetic -thermal field coupling process. The contact resistance is one of the main causes of heat loss in electromagnetic emission. The contact resistance produces great current density in the contact surface area of rail and armature,which causing material ablation easily.