Droplet Formation for Liquid Monopropellant Jets

摘要

The hydrodynamic development of droplets for conditions approximating those in the combustion chamber of regenerative liquid propellant guns has been investigated. The report contains a literature survey and discussion of various breakup mechanisms. Aerodynamic interaction is analyzed using classical stability theory and a formulation applied to anticipated working conditions. The model predicts mass removed and droplet size as a function of time. Results indicate that the jet does break up with almost all liquid atomized. Comparison to a simple burning rate model verifies that the hydrodynamic model is primarily responsible for liquid removal from the intact core. Results conflict with recent inverse gun code predictions which suggest significant liquid accumulation is occuring; i.e. the jet does not fully atomize and subsequently burn. A discussion of possible reasons for this discrepancy is included. Keywords: Liquid monopropellant, Hydrodynamic jet stability, Regenerative gun.