Unsteady flamelet modeling for N2H4/N2O4 flame accompanied by hypergolic ignition and thermal decomposition

In this study, the applicability of flamelet approach to numerical simulations hydrazine (N2H4)/nitrogen tetroxide (NTO, N2O4) combustion, in which hypergolic ignition and thermal decomposition occur, is investigated terms two-dimensional two types N2H4/NTO jet flames, namely, gaseous flame N2H4 spray NTO stream. case flame, simulation performed employing unsteady flamelet/progress variable (UFPV) approach. on other hand, a non-adiabatic (NAUFPV) approach, combines UFPV (NAFPV) proposed. The validity these some existing approaches by comparison with results obtained using exact detailed chemical reactions are directly solved. show that NAUFPV drastically improve predictions combustion behavior, respectively, including process, lift-off height, distributions temperature species concentrations. This indicates self-decomposition fuel successfully captured can additionally take into account heat loss effect due evaporation droplets.