In order to stabilize combustion of highspeed gas, both the strong swirl and the flow around blunt bodies can form low velocity recirculation zone. The vortex shedding mechanism of the flow around bluff body with swirling flow through the central opening is predicted. 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 cy...