Liquid Fueled Ramjet combustion Instability: Acoustical and Vortical Interactionswith Burning Sprays

摘要

A theoretical/computational study of liquid-fueled ramjet instability has beenperformed. The roles of droplet vaporization and spray combustion processes have been determined as rate-controlling factors on the performance and stability of combustors. The effects of vaporization, mixing, turbulent transport, and chemical kinetics were evaluated. The impact of variations in geometry, initial droplet size, equivalence ratio, and various numerical factors were determined. The study had four major components: (i) individual droplet studies, (ii) a one-dimensional combustor analysis, (iii) a planar combustor study, and (iv) an axisymmetric study. A predictive capability was developed. Vaporization processes and droplet trajectories were found to affect performance and stability significantly. Keywords: Combustion instability; Liquid fuel ramjet. (jes)