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
No takes yet. Share an insight, caveat, or question.
Rogers et al. (1994) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: