STABILITY OF A LIQUID JET WITH REGARD TO ATOMIZATION AND MIXING IN ROCKETS ENGINES

Coaxial Injectors are used for the injection, atomization and mixing o f propellants in cryogenic H-2/O2 rocket engines. Thereby, a round liq uid oxygen jet, whose behaviour is in focus of this article, is atomiz ed by a fast, coaxial hydrogen jet. The behaviour of the liquid jet un der the influence of the aerodynamic forces is a decisive part of the global propellant atomization and mixing process. With the assumption that the jet disturbances are infinitesimally small it is possible to find analytical algorithms to describe the jet deformation. The influe nce of real effects as finite amplitude and deformation of surface wav es and droplet formation are calculated using a two-dimensional numeri cal procedure. The result of these non-linear simulations are in agree ment with experimental evidence and form a valuable part to understand the atomization process. The investigations serve as a basis for the development of an atomization model with the final aim to integrate th is into models for global processes as e.g. the flow in a combustion c hamber.