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1 International Journal of Applied Mechanics and Engineering

1 2008

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Mixing and flame holding characteristics in two-dimensional supersonic stream with perpendicular injection

Ali M., Ahmed S., Sadrul Islam A. K. M.

International Journal of Applied Mechanics and Engineering

2008

Vol. 13, no 1

5-20

This paper reports the mixing of hydrogen in a supersonic airstream and the fIame holding capability of the combustion chamber. In particular, two-dimensional Navier-Stokes equations have been solved to see the effects of injector positions on mixing and fIame holding in a supersonic combustor. An explicit Harten-Yee Non-MUSCL Modified-fIux-type TVD scheme has been used to solve the system of equations, and a zeroequation algebraic turbulence model to ca1culate the eddy viscosity coefficient. The performance of combustor has been investigated by varying the distance of injector position from the left boundary keeping constant the backward-facing step height and other ca1culation parameters. The results show that the configuration for small distances of injector position has high mixing efficiency but the upstream recirculation cannot evolve properly which is an important factor for fIame holding capability. On the other hand, the configuration for very long distance has lower mixing efficiency due to lower gradient of hydrogen mass concentration on the top of the injector caused by the expansion of side jet both upstream and downstream of the injector. For moderate distances of injector position, large and elongated upstream recirculation can evolve which might be activated as a good flame holder.