Modeling of HMX/GAP pseudo-propellant combustion

E. S. Kirn, V. Yang, Y. C. Liau

Research output: Contribution to conferencePaperpeer-review


Numerical simulation of HMX/GAP pseudo-propellant combustion has been performed with detailed chemical kinetics. The model considers three different regions: solid phase, near-surface two phase, and gas phase. With interfacial boundary conditions, the analyses for the gas phase and nearsurface two phase are based on the conservation equations of mass, energy, and species concentration, whereas the analysis for the solid phase is based on the energy equation. Using existing experimental data, the kinetic-rate parameters of the condensed-phase decomposition mechanisms for both HMX and GAP have been deduced and are incorporated into the model to investigate the burning rate of HMX/GAP pseudo propellants. Four global decomposition reactions of HMX and GAP as well as subsequent reactions are considered in the condensed phase. In the gas phase, a comprehensive chemical kinetics scheme involving 74 species and 532 reactions is employed to study the detailed heat release mechanism. The model has been applied to a broad range of pressure and laser intensity. External heat flux from a CO2 laser exhibits a strong effect on the propellant burning characteristics at low pressures. The effect decreases at high pressures since the conductive heat feedback from the gas to the condensed phase becomes stronger. Results show that the burning rate decreases with the addition of GAP at low pressures, even though the burning rate of GAP itself is much higher than pure HMX. Conversely, above certain pressure levels, the burning rate of HMX/GAP pseudo-propellants increases with increasing GAP concentration.

Original languageEnglish
Publication statusPublished - 2001
Event39th Aerospace Sciences Meeting and Exhibit 2001 - Reno, NV, United States
Duration: 2001 Jan 82001 Jan 11


Other39th Aerospace Sciences Meeting and Exhibit 2001
Country/TerritoryUnited States
CityReno, NV

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering


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