2D-planar particle image velocimetry(PIV) was utilized to investigate the effects of swirl number combinations on flow characteristics of triple-swirlers. The studied triple-swirlers have the same rotational combination with clockwise inner swirler,counter-clockwise intermediate swirler and counter-clockwise outer swirler. The inner swirl number,intermediate swirl number and outer swirl number are 1.4,1.0 and 0.6 for scheme B,while 0.6,1.0 and 1.4 for scheme A respectively. The total pressure loss coefficie...