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Chinese Journal of High Pressure Physics  > 2014  >  28(1): 91-96.
GONG Fei, WENG Chun-Sheng. Thermal Effect of Sliding Electrical Contact in Electromagnetic Railgun[J]. Chinese Journal of High Pressure Physics, 2014, 28(1): 91-96. doi: 10.11858/gywlxb.2014.01.015
Citation: GONG Fei, WENG Chun-Sheng. Thermal Effect of Sliding Electrical Contact in Electromagnetic Railgun[J]. Chinese Journal of High Pressure Physics, 2014, 28(1): 91-96. doi: 10.11858/gywlxb.2014.01.015
shu

Thermal Effect of Sliding Electrical Contact in Electromagnetic Railgun

doi: 10.11858/gywlxb.2014.01.015

  • National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China

  • Received Date: 26 Apr 2012
  • Rev Recd Date: 17 Jul 2012
    Abstract
  • In order to reflect the temperature rise process on the sliding electrical contact interface exactly, a numerical model of imperfect electrical contact (ImPEC) during hypervelocity sliding in electromagnetic railgun is developed.The model is implemented with finite difference method, and the thermal effect of contact resistance is simulated.The results show that more heat is generated on the contact interface due to the ImPEC.With the increasing of the thickness of the contact layer, the temperature rise on the contact interface becomes higher.Due to the velocity skin effect, the heat generated by the contact resistance is mainly concentrated at the trailing region of the interface.Furthermore, the calculated temperature is significantly influenced by the thermal conductivity and the shape of the input current.The results provide a theoretical basis for estimating the material state of sliding interface and predicting the contact transition.

     

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