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Numerical study of armaturerail contact interfacial conditions in electromagnetic railguns


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Numerical study of armaturerail contact interfacial conditions in electromagnetic railguns
Gong FeiWeng Chunsheng
National Key Laboratory of Transient Physics,NUST,Nanjing 210094,China
electromagnetic railgunsarmaturerailcontact interfaceselectrothermal propertiesfinite difference methodimperfect electrical contactthermal effectscontact forcetemperature risefriction effect
To understand the electrothermal properties of the armaturerail electrical contact interfaces in electromagnetic railguns exactly,the thermal effect of imperfect electrical contact(ImPEC) is modeled using the contact heat flux model and finite difference method.The friction effect and the effects of different geometry of armatures on the contact force and temperature rise are studied.The calculation results show that the Cshape armature can provide a higher contact force than the block one.The maximum temperature of the contact interface decreases by 31%,and the temperature distribution is more uniform in the Cshape armature.With a decrease of 15° in the rear angle of the armature,the maximum temperature of the contact interface decreases by more than 10%.The friction delays the motion of the armature and the velocity decreases by 9%,which is unfavorable for the transmitting efficiency.


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Last Update: 2014-06-30