The effects of hollow bluff body geometry, surface curvature, blockage ratio, mixture
residence time, impingement strength, heat recirculation eddy size, Reynolds and Froude
numbers were all investigated via 10 bluff body shapes. It was found that duplicating the
wake flow zone and increasing the mixture flow velocity inside the bluff body cavity via a disc
configuration provide a maximum blow-off velocity of 49 m/s. Enlarging the bluff body
exterior surface area and the flow wake width in addition to elongating the mixture residence …

The combined effects of flow recirculation and preheating on the premixed flame stability
limits were employed via two flow configurations. In the first configuration, the natural gas-air
mixture was set to flow around a bluff body whose orientation, number of vertices and vertex
angle were varied. In the second configuration, an innovative design was developed where
the fuel–air mixture was set to flow inside the bluff body as two opposing jets whose
resultant flow is redirected to pass around the bluff body. The peak turbulent kinetic energy …