1994/03/01 by C. B. Rogers, Chris Rogers, D. E. Parekh · 1 citation
Engineering · #Aerodynamics and Acoustics in Jet Flows #Computational Fluid Dynamics and Aerodynamics #Computer science #Fluid Dynamics and Turbulent Flows #Jet (fluid) #Jet noise #Mechanics #Mixing (physics) #Noise (video) #Physics #Reynolds number #Strouhal number #Tourbillon #Turbulence #Vortex #Vortex generator
paper · doi:10.2514/3.12009
openalex publication_date 1994/03/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Streamwise vortices are generated in the exit of a Mach-0.6 rectangular air jet by half-delta wings at various angles of attack. They entrain close to 50% more mass by 3.7 jet diameters and reduce the downstream jet noise at 23 diameters away from the jet nozzle by up to 3 dB. The mixing improvement and jet noise characteristics are both strong functions of the strength and relative position of the vortices. Mass entrainment measurements were measured quantitatively with local pitot-static pressure measurements and through image analysis. The image analysis also gave average spatial information about the mass entrainment through scalar transport