The GH2/GO2 combustion flow field in a chamber with a single-element typical shear-coaxial injector was numerically simulated firstly.The characteristics of the flow field and the shear-coaxial injector architecture were analyzed to enhance the mixing and decrease the combustion length

some improved designs were made for suiting high flowrate conditions.Numerical analysis and validation experiments were conducted for single-element chambers with these injectors.The improved shear mixing element with high H2/O2 velocity ratio and a flared O2 post tip could maintain a benign heat load environment

and effectively enhance the GH2/GO2 mixing suitable for the combustion in the nominal combustor with high injection flowrate.The results directly contribute to the high flow rate gas-gas injector design and the design methodologies in this paper give references for further studies.