Critical reactions for the hydrazine vapor detonations

A detailed kinetic model devoted to the hydrazine vapor detonation has been built. It consists of 33 reversible reactions and 13 species. A reduced kinetic model has been proposed by using the Principal Component Analysis of matrix F (PCAF) method as implemented in KINALC. It is constituted of 26 reactions and 11 species. This model has been shown to be valid over a pressure range of 0.1 to 10 atm. However, the predictions of the models are significantly affected by changes in the enthalpy of formation of N₂H₃. With the help of the full kinetic model, a value of A, the proportionality factor in the ZND model between the induction distance in the detonation wave and the detonation cell size, of 27.5 ± 3.0 has been derived if one considers that the collision efficiency of N₂H₄ on the thermal decomposition of hydrazine is equal to the one of N₂. The value of A for pure hydrazine detonation is shown to be strongly dependent on the value of the collision efficiency of H₂H₄.