Experimental Investigation of Turbulent Non-reacting flow in a Double Swirl-stabilized Burner*

Understanding the non-reacting flow field is crucial for optimizing burner design, stability and validation of numerical data. The Stereo Particle Image Velocimetry (SPIV) technique is used to observe the double swirl-stabilized burner 's non-reacting turbulent flow structure. Components of velocity such as axial, radial and tangential and turbulent parameters such as turbulent intensity and Reynolds stress are also obtained. The burner is configured with two swirlers such as inner and outer swirler and bluff body along with three annuli i.e inner, outer and co-flow. The swirl numbers (S) of inner and outer swirlers are 0.82 and 0.88 respectively and both are medium range swirlers. The effect of inner and outer bulk velocities on turbulent flow structures is presented, where the outer bulk velocity remained constant in the first three cases and the inner bulk velocity remained constant in the remaining three cases. It is observed that the velocity is axially dominant by an increase in inner bulk velocity where as increase in outer bulk velocity shows radial spread. The tubulent parameters also observed to be increased by increasing inner and outer bulk velocities.