Nair, Prasanth P.Prasanth P.NairNarayanan, VinodVinodNarayanan2025-08-312025-08-312023-01-01[9781624107047]10.2514/6.2023-41372-s2.0-85187218606http://repository.iitgn.ac.in/handle/IITG2025/29278Scramjet technology is seen as the future for high-speed transportation and reusable launch vehicles for satellite placement, but combustion of fuel at supersonic speeds poses a challenge. Due to the supersonic velocity, there is less retention time for air and fuel to mix properly. Placing pylon upstream of the cavity has been observed to enhance the mixing efficiency. However, the effect of the pylon on the downstream of the cavity has not been investigated. The present study aims to address this issue by investigating the effects of fuel injection with a pylon placed downstream of the cavity to enhance mixing with different locations of fuel injection. The study utilizes numerical simulation using a hybrid RANS/LES simulation with an improved delayed detached eddy simulation (IDDES) turbulence model and validated results with a cavity-based combustor benchmark. The study found that the downstream placement of the pylon, along with different injection positions, had a significant effect on mixing efficiency. Further analysis was conducted using dynamic mode decomposition (DMD) to gain insights into the dynamics of the mixing process. It was found that the fuel injection normal to the flow direction had a significant effect on the mixing efficiency.falseConference Paper20234cpConference Proceeding2