Similarity of combustion flowfield in a single element gas-gas injector chamber

Single-element shear-coaxial injector heat sink chambers are designed with shear-coaxial injectors. Gaseous hydrogen and gaseous oxygen are chosen as propellants. Hot-fire tests at seven chamber pressures from 0.92 to 6.10 MPa are conducted in the same chamber, and two geometrically similar chambers are tested at the same chamber pressure. When the chamber pressure and the chamber size change, the propellant temperatures, mixture ratio, and the injection velocities are kept constant. Wall temperature measurements are utilized to compare the characteristics of the combustion flowfields in the tests. The results indicate that the combustion flowfields of different chamber pressures and chamber geometries are actually similar.