Investigation on Recess Variation of a Shear Coax Injector for a Single Element GOX-GCH4 Combustion Chamber

Abstract

In the current study the effects of oxidizer post recess length variation in a shear coaxial injector have been experimentally investigated. Different injector configurations are used to inject oxygen and methane, both in gaseous form, into the combustion chamber at pressure levels between 10 and 20 bar. It has been observed that the GOX post recess enhances the mixing between the propellants when its length is longer than one GOX post exit diameter. The pressure drop across the injector increases with the recessed oxygen tube compared with the flush mounted case. The variation in wall temperature and pressure axial profile, the pressure drop at the injector and the influence of the injector setup on the heat loads to the wall are the focus of the present investigation.