Effects of air jet on bluff body stabilized flame: Validation by simulation

A burner having a conical bluff body with a central air injector is considered. In this paper, the effects of the central air jet on the heat load of the bluff body are investigated. The flame structures and the flame blowoff temperatures were compared with corresponding simulated outcomes. Simulation results show that the considerable reduction in the heat load to the bluff body by the central air jet determined experimentally is quite valid. Thus the problem caused by the high heat load in practical applications has a solution. The addition of central air jet alters the flame structures and blowout temperatures, as shown in simulation as well as experiment. Various blowout behaviors caused by the air jet observed experimentally also match those that were simulated. It is evident from simulation and experimentation that the center air injection could cool down the bluff-body. However, the flame stability could not be accomplished.