Numerical simulation of dual shear coaxial gas-gas injector

The turbulent Navier-Stokes equations in combination with the two equation k-ε turbulence model were used to simulate the flowfield in chambers of dual shear coaxial injector which the gaseous oxygen and hydrogen were used as propellants. The results of investigation display that; compared with traditional shear coaxial injector, the dual shear coaxial injector creates two shear combustion faces in chamber, and its outline varies a small amount. The ratio of center hydrogen mass flowrate to the total hydrogen mass flowrate is a key parameter for dual shear coaxial injector; at the ratio of 0.3, the advantage of two combustion surfaces is exerted completely. The dual shear coaxial injector could achieve a high combustion efficiency at the condition of large mass flowrate.