Orthogonal optimization design for a hydrogen-rich/oxygen-rich shear tricoaxial gas-gas injector

To study the influence of the design parameters of a hydrogen-rich/oxygen-rich shear tricoaxial gas-gas injector on the combustion performance and the heat load performance, the parameters were fitted combination through the orthogonal experiment design method. The flow field of the single injector combustor was simulated. Evaluation indexes were the combustion length, the average gas temperature on combustion chamber wall and the average gas temperature on the injection faceplate. The results show that the fuel velocity to the oxidizer velocity has the most remarkable influence on the combustion performance and the heat load performance, the percentage of the central fuel mass flow rate has very obvious impact on the heat load performance, and the ratio of the oxidizer pressure drop to the combustor pressure has notable influence on the faceplate temperature, while the oxidizer post tip wall thickness has insignificant influence on the performance of the injector. To some extent, the interaction between the velocity ratio and oxidizer pressure drop affects the performance of the injector, while other interactions of the design parameters have little influence. The shortest combustion length i s 117.9mm. The lowest wall temperature is 1637.7K, and faceplate temperature is 806.6K.