Numerical simulation of shear dual-coaxial gas-gas injector

The turbulent Navier-Stokes equations in combination with two equation k-ε turbulence models were used to simulate the flow field of shear dual-coaxial single element GO₂/GH₂injector chamber. The results show that: the shear dual-coaxial injector has two shear combustion surfaces, enabling to achieve a high combustion efficiency at the condition of large mass flowrate, the oxygen injection velocity and the velocity ratio of hydrogen to oxygen are key parameters for shear dual-coaxial injector design, a lower oxygen injection velocity makes the combustion location far away from the faceplate, while a higher velocity ratio makes the combustion location closer to the faceplate. Compared with the gas-liquid shear coaxial injector, a faster oxygen injection velocity and proper velocity ratio of hydrogen to oxygen are preferable choice for design of shear dual-coaxial injector.