New design of a hot mixing chamber for lowering its surface temperature by adopting a perforated inner cylinder

This study aims to design a novel modified hot mixing chamber (HMC) with high performance and light weight by improving the existing basic model with high surface temperature, heavy weight, and nonuniform flow and temperature distribution at the outlet. The basic and modified HMC models were simulated and compared, and an experiment was performed on the modified model for validation. Results showed that the HMC surface temperature of the modified model was reduced by 289 °C compared with that of the basic model. Numerical simulations for the centerline and surface temperatures of the modified HMC model exhibited good agreement with the experimental results. The highest combustion temperature was achieved with a stoichiometric reaction within a range of equivalent ratios of 0.8–1.2. The modified HMC model that adopted the aforementioned design and configurations reduced surface temperature, extended operating life, and significantly decreased HMC weight.