Steady-State Rocket Combustion of Gaseous Hydrogen and Liquid Oxygen. Part I. Experimental Investigation

Study on Breakup Length of Liquid Jet by Liquid-Gas Coaxial Injector —Evaluation of Atomization Characteristics of Rocket Engine Injectors—

“…The calculated and experimental breakup lengths are in proper agreement. In the figure, the cases for liquid nitrogen/gaseous nitrogen jet 1) and LOX/hydrogen jet during combustion 3) are also plotted, and the inclinations of agreement between the calculated and experimental values are almost the same. This means that the present calculation model is applicable for evaluating the atomization characteristics of actual rocket engine injectors.…”

“…2) Also, an experiment using a LOX/hydrogen jet under combustion conditions 3) was added to the figure, though the results show rather higher values. Here, the present calculation model is basically based on that of a previous model developed by the author, 4) which is applicable for predicting the spray characteristics of either a round liquid jet or a liquid sheet injected into a high-velocity uniform gaseous flow field.…”

Study on the Design Criteria of the Coaxial Injector for a LOX/Hydrogen Rocket Engine —Evaluation of Design for Injectors of the LE-5 Engine and Its Derivatives—

“…However, the assumed modeling of the atomization process of the LOX jet was simplified as the constant rate of atomization for the region of atomization, because reliable modeling of that process had not yet been studied at the time. In other typical models of combustion, 2,3) instantaneous atomization at the exit of the injector elements and the mono-dispersed size of the LOX spray were considered, and the quasi-steady state vaporization of the representative droplet in a forced convection environment was applied to calculate the amount of reacted mass of propellant. In the author's recent study, 4) however, a detailed model of the atomization characteristics of the coaxial injector of the liquid/gas phase, including the local rate of atomization and the size distribution of formed spray, was developed.…”