Numerical study of hydrogen-air mixing in turbulent compressible coaxial jets

Furthermore, it is found that the turbulent mixing activity is subjected to an intermittent specificity of the coherent vortices: ring structures with intermittent mushroom-type structures characterizing the ejection phenomena due to the longitudinal counter-rotating vortices. The H2 is quasi-completely dissipated as it is entrained outward the rings and transported by the irrotational stream (air). To overcome this situation, it is recommended to lock the inner jet by an outer jet. The studies with and without confinement display the same results even in 2D as the convective Mach number is subsonic Mc=0.44.