To investigate the combustion characteristics of high flowrate injector in the multi-element injector chambers having interaction between the elements

based on high flowrate gas-gas injector studies in the single-element condition

a multi-element injector equipped with seven shear mixing elements was deigned

which can simulate effectively the real engine.The shear mixing element had high H2/O2 velocity ratio and tapered O2 post tip.Numerical simulation and hot-fire tests were carried out with this injector using the optimal design of the injector layout.Steady operations were obtained in all these tests

and the injector showed benign heat environments on the faceplates and cylinder walls.Combustion efficiency above 99% was gotten for this injection element in the flowrate of 3.7 times of SSME(space shuttle main engine) main injection element.