Steady-state hydrazinium nitroformate (HNF) combustion modeling

Two simplified modeling approaches are used to model the combustion of hydr azinium nitroformate (HNF), N2H5. C(NO2)(3). The condensed phase is treated by high-activation-energy asymptotics. The gas phase is treated by two lim it cases: the classical high-activation-energy approximation and the recent ly introduced low-activation-energy approach. This results in simplificatio n of the gas-phase energy equation, making an (approximate) analytical solu tion possible. The results of both models are compared with experimental re sults of HNF combustion. It is shown that the low-activation-energy approac h yields better agreement with experimental observations, for example, regr ession rate and temperature sensitivity, than the high-activation-energy ap proach.