Study on the Vortex Structure of Coupling Combustion Stabilizer with Square Cylinder-strong Swirl Flow

Strong swirl and a blunt body are two commonly used structure to form low velocity recirculation zone to stabilize combusting of high-speed gas. Compared with the vortex shedding mechanism of the square cylinder blunt, the computational results show that the vortex shedding mechanism of the coupling combustion stabilizer is controlled by the vortex of the swirling flow instead of the cylindrical vortex. Also, the flow around bluff body with swirling flow through the central opening can reduce drag, increase the length of the recirculation zone and reflux mass, and increase the number of vortexes so as to enhance the heat and mass transfer. Thus, coupling combustion stabilizer can enhance the stability of flame.