Single-element shear-coaxial GH2/GO2 and GH2/LOX injectors were numerically simulated.Two-phase turbulent combustion process of GH2/LOX was simulated with chemical Navier-Stokes equations and discrete particle model.Chemical reaction was calculated with Arrhenius formulation.GH2/GO2 and GH2/LOX combustion flowfields and the influences of some key design parameters on two types of fields were obtained.The combustion completion length of GH2/GO2 injector is longer.The injection flowrate and momentum ratio are key parameters for the both types of injectors

and the influence tendencies of these two parameters are the same.The injection velocity is less influential to both types of injectors.