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Abstract : Full Article Figures & data References Citations Metrics Reprints & Permissions Read this article Abstract This study numerically investigates the characteristics of unsteady vortex shedding phenomena behind V-gutter bluff bodies, with an emphasis on their application for achieving reliable and energy-efficient combustion in air-breathing propulsion systems. The study explores the effect of the V-gutter’s semi-span angle and the provision of a central slit on the leading edge of the bluff body, on the modification of the wake, which is critical for flame stabilisation. The transient non-reacting fluid flow over the V-gutter bluff body is modelled with two discrete semi-span angles (60° and 30°) and with four central slit diameters (1, 0.75, 0.5, and 0.25 mm). Based on the characteristics of the wake, the study shows that the V-gutter that has a semi-span angle of 60° and a central slit of 0.25 or 0.5 mm would be the most effective configuration within the range of parameters considered in the study.