Influence of Pseudo-Boiling Phenomenon and the Mass Flux Ratio on the Dynamics of Transcritical Shear Flame

Document Type : Research Article

Authors

1 Aerospace Engineering Faculty, Sharif University of Technology

2 Iranian Space Research Center, Tehran, Iran

3 Aerospace Department, Sharif university of Technology

Abstract

In the present paper, the effects of the interaction of a high-density liquid oxygen jet with high-velocity hydrogen in the presence of a pseudo-boiling phenomenon are investigated. The pseudo-boiling phenomenon causes a sudden expansion in the flame, which leads to the formation of a recirculation zone. Different turbulence models have been investigated and it has been shown that the selection of a suitable turbulence model for the trans-critical reacting flow is much more important than subcritical and supercritical flames. Also, contrary to expectations, the dense core of liquid oxygen disappears faster in the non-reacting case than the reacting flow, which is due to the displacement of the mixing layer in the reacting flow due to the intense expansion (because of the pseudo-boiling phenomenon). The effects of mass flux ratio were also investigated and it was observed that by increasing the mass flux ratio from 5 to 24, a strong recirculation is formed at the flame front and the flame becomes like a bubble, similar to LOX-GCH4 flame. Increasing the mass flux ratio leads to an increase in the strength of the shear layer that causes the pseudo-boiling phenomenon to occur at a higher rate. Finally, increasing conversion of the liquid-like oxygen to gas-like conditions leads to the formation of a strong vortex in the flame front.

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