Volume 23 Issue 2
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ZHAO Yan-Hong, LIU Hai-Feng, ZHANG Gong-Mu. Equation of state of detonation products for PETN explosive[J]. Chinese Journal of High Pressure Physics, 2009, 23(2): 143-149 . doi: 10.11858/gywlxb.2009.02.011
Citation: ZHAO Yan-Hong, LIU Hai-Feng, ZHANG Gong-Mu. Equation of state of detonation products for PETN explosive[J]. Chinese Journal of High Pressure Physics, 2009, 23(2): 143-149 . doi: 10.11858/gywlxb.2009.02.011

Equation of state of detonation products for PETN explosive

doi: 10.11858/gywlxb.2009.02.011
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  • Corresponding author: ZHAO Yan-Hong
  • Received Date: 22 Apr 2008
  • Rev Recd Date: 10 Sep 2008
  • Publish Date: 15 Apr 2009
  • The equation of state of detonation gas products is described by Ross's modification of hard-sphere variation theory and the improved one-fluid van der Waals mixture model. The Gibbs free energy of dissociated carbon is calculated for the most probable state, which is determined by distinguishing the following four states of carbon: graphite, diamond, graphitelike and diamondlike. The equilibrium compositions of detonation products are calculated by solving chemical equilibrium equations based on minimizing free energy. The detonation properties at CJ point of PETN explosives are calculated with this theory and the results show satisfactory agreement with the experimental data. We have also compared the adiabatic expansion from the CJ point calculated with the present theory and JWL equation. The adiabatic gamma decreases in the present theory but exhibits double peak in JWL equation. We suggest that double peak in JWL equation is made by the equation form itself and it doesn't correspond with actual physical process.

     

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