Study of Hydrazinium Nitroformate (HNF) Flame Structure Using Laser Doppler Anemometry

摘要

An experimental study of the HNF monopropellant flame at low pressure has been performed to estimate the global kinetic rates for the reactive gas-phase regions above the burning surface. Laser Doppler anemometry (LDA) in conjunction with simultaneously recorded video images of the burning pellets has provided useful information on the flame structure of HNF oxidizer such as the velocity profile and the thickness of the three regions of the flame (fizz zone, dark zone and luminous flame). The reaction rates and the overall reaction orders were determined from measurements of burning rate and flame zones thickness pressure dependence. The averaged gas velocity, u_g, estimated from LDA velocity measurements, has been used to determine the reaction time of the gas-surface chemical reactions.