摘要
电磁发射过程中电枢表面熔化会改变枢轨接触状态,一旦接触状态被破坏则容易出现转捩,因此有必要对电枢表面的熔化特性进行分析。考虑枢轨接触面的粗糙度,列出了枢轨接触界面间金属液化层的Reynolds方程,并耦合温度场、应力场及电磁场,建立了热弹性磁流体动力学模型,在此基础上分析了粗糙度量级及分布形态对枢轨接触面间电枢表面熔化速度与金属液化层厚度的影响。结果表明,在设定参数下的动态发射过程中,枢轨接触面粗糙度量级越大,电枢表面的熔化速度越大,最小液化层厚度也越大;相比于粗糙的分布形态,粗糙度量级对电枢表面的熔化速度和金属液化层厚度的影响更大。分析结果对于改善枢轨接触状态,避免转捩情况的发生具有重要意义。
In the process of electromagnetic launch,the surface melting of the armature will change the contact state between armature and rail.Once the contact state is destroyed,the transition is easy to occur.Therefore,it is necessary to analyze the melting characteristics of the surface of armature.Considering the contact surface roughness between armature and rail,the Reynolds equation of the metal liquid layer of the contact surface is listed,the temperature field,stress field and electromagnetic field are coupled,and the thermo-elastic-magnetohydrodynamics model is established,based on this,the effect of roughness magnitude and distribution of the contact surface on the surface melting speed of armature and thickness of metal liquid layer are analyzed.Under the setting parameters,the results show that the greater the magnitude of contact surface roughness,the bigger melting speed of the surface of armature,and at the same time,the greater the minimum thickness of metal liquid layer.Compared to the distribution of roughness,the magnitude of contact surface roughness has a greater effect.The analysis results are of great significance for improving the contact state between armature and rail and avoiding the transition.
作者
李白
鲁军勇
谭赛
姜远志
张永胜
赫蕾
Li Bai;Lu Junyong;Tan Sai;Jiang Yuanzhi;Zhang Yongsheng(National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering,Wuhan 430074,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第7期1607-1615,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(51522706，51407191，51307176)。
关键词
滑动电接触
粗糙度
熔化
金属液化层
磁流体动力学
Sliding electrical contact
roughness
melt
metal liquid layer
magnetohydrodynamics
