Thermal environment of pylon at different mode in RBCC

Based on the unilateral expansion configuration of RBCC engine, three-dimensional numerical analysis are carried on the effects of rocket jets and secondary combustion on the thermal environment of pylon under different modes. The results show that under the ejector mode, large flow rate of the rocket makes thermal load of the pylon most serious, which thermal protection is needed to focus on more. Compared with the ramjet mode, the combustion in the combustion chamber is more dependent on the pylon in the scramjet mode. The increase of the injection equivalent ratio makes the core area more intense, temperature of the pylon higher, thermal load more serious. After the rocket is closed, the secondary combustion is organized by the pylon, high temperature area is mainly concentrated in the tail and thermal protection should be transferred to the rear part accordingly.