Abstract
Nonreacting flow in a backward-facing step combustor is studied while employing a novel countercurrent shear (or counterflow) concept. Counterflow is used to manipulate the turbulent shear layer created by the step to increase turbulent burning velocities, and thereby, reduce ignition delay time. Unfortunately, this concept also leads to a smaller residence time because of a shorter recirculation vortex. These competing challenges of achieving higher burning velocities and longer residence time demand modification of the step geometry. Changes in the step geometry will alter the size and characteristics of the recirculation vortex and the shear layer dynamics within the combustor. These issues are addressed in this paper via a numerical study. For the simulations, Reynolds-averaged Navier–Stokes equations are solved in the framework of the realizable k–� turbulence model. A two-layer approach is used for the near-wall modeling. The paper includes a detailed account of the benefits of countercurrent shear technology, a parametric study based on step-geometry modifications, and an aerodynamic performance evaluation.
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