Numerical simulation of 3-D full-size model was conducted for 2000N gas hydrogen/gas oxygen vortex cooling thrust chamber.Velocity distribution characteristics of the flow field were obtained

and existence of the bidirectional vortex structure was verified.The interface of inner and outer vortexes accounted for 86% of the thrust chamber cylinder radius

and the combustion zone took up 70% of the thrust chamber cylinder radius.Analysis showed that the outer vortex cooling layer was mainly influenced by incoming stream velocity and geometric parameters of thrust chamber. The pressure and density of the inner vortex maintained stable due to the viscosity and combustion.The average temperature of the thrust chamber sidewall was 388K.The specific efficiency was above 92%.The results of computation were consistent with the experiment results.