Numerical investigations on the mixing characteristics of cold coaxial jets in a dual combustion ramjet engine

• Main Authors: Sebastin, J. Sarathkumar, Jeyakumar, S., Karthik, K.
• Format: Conference Proceeding
• Language: English
• Subjects: CAD; Combustion chambers; Computer aided design; Flow characteristics; Fluid flow; Gas generators; K-omega turbulence model; Mathematical models; Numerical analysis; Pressure loss; Ramjet engines; Reacting flow; Reynolds averaged Navier-Stokes method; Stagnation pressure; Supersonic flow; Turbulence models
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0127770

In non-reacting flow conditions, the mixing characteristics of the transverse injection in a Dual Combustion Ramjet engine are investigated using both experimental and numerical analysis. The study focuses on the assessment of the supersonic flow characteristics in the vicinity of the gas generator's injection location and downstream. At two positions with varying injection pressure ratios, ranging from 1.875 to 2.125, the fuel is injected. The numerical simulations have been performed by using the Reynolds Averaged Navier Stokes equation with the SST k-ω turbulence model. The computational studies are carried out using commercial software ANSYS Fluent 18.0. The computational results have been validated with the experimental results and are in good agreement with them in terms of wall pressures. The results reveal that the transverse injection at the inlet of the supersonic combustor enhances the mixing of the coaxial jets with less stagnation pressure loss due to the counter-rotating vortices generated at the nozzle rim of the gas generator. In contrast, these inherent advantages could not be noticed with isolator injection methods.