Abstract
The results of experimental investigations of the features of diffusion combustion during the interaction of a round supersonic microjet of air in the center and a coaxial (coflowing ring) jet of hydrogen. Such combustion is accompanied by a number of new phenomena: the formation of a cone-shaped flame near the nozzle сutoff, the locking of the combustion region in this cone, the presence of small-scale supersonic cells in the resulting flow, and the formation of laminar sections and their turbulization.
Highlights
The results of experimental investigations of the features of diffusion combustion during the interaction of a round supersonic microjet of air in the center and a coaxial jet of hydrogen
The aim of this study is to investigate the features of development and interaction between a round microjet of air flowing at supersonic velocity and a coaxial hydrogen jet during its combustion
At low outflow velocity of the jet, one can observe the presence of the laminar flame, the boundary of which expands under a noticeable angle
Summary
The results of experimental investigations of the features of diffusion combustion during the interaction of a round supersonic microjet of air in the center and a coaxial (coflowing ring) jet of hydrogen. Such combustion is accompanied by a number of new phenomena: the formation of a cone-shaped flame near the nozzle сutoff, the locking of the combustion region in this cone, the presence of small-scale supersonic cells in the resulting flow, and the formation of laminar sections and their turbulization. One of the characteristics of supersonic jet flow is the presence of supersonic cells, which are preserved in the resulting flow during combustion but in the situation of a flame rising from the nozzle cutoff. The theoretical study in [14] shows the development of a coaxial jet at subsonic and supersonic velocities and numerically simulates the presence of supersonic cells during the supersonic flow of a coaxial jet
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