Abstract
Effective mixing in a short mixing chamber is a major challenge in supersonic air breathing engines, especially the mixing between two high speed co-axial streams. The residence time is a major factor to get the two streams properly mixed. The selection of mixing method is crucial in the supersonic conditions. An experimental study has been performed on the supersonic mixing of air from strut injectors of various combinations in their trailing ramp angles with a free stream air of Mach number 2. Two different configurations of geometries, a plain geometry and a lobed geometry considered and further two different combinations, slot and hole injections, are taken for the study in each geometry. Among different combinations, it is found that a better mixing enhancement is achieved for the 9o lobed geometry struts.
Highlights
The fuel injection, mixing, ignition, combustion and residence time are important activities in the scram jet engines since all these activities should be performed in the order of milliseconds
Active and passive methods are broadly used as mixing enhancements
The initial condition of the jet is changed by changing the nozzle geometry
Summary
The fuel injection, mixing, ignition, combustion and residence time are important activities in the scram jet engines since all these activities should be performed in the order of milliseconds. The capability to enhance the mixing in supersonic flows from struts with various trailing ramps were achieved by Sujith et al [5] with a free stream air at Mach number 1.63 and a secondary air injection. Linguin HOU et al [6] in their numerical analysis of multi staged injection found that the two stage injection makes full use of the residual oxygen near the wall and the second stage injection avoids the strong shock waves in the far downstream locations results a rising wall pressure and to achieve a good burning effects after the wall injection This allows more fuel to be injected into the combustor without causing thermal choking.
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