In order to obtain fuel spray characteristics of dual-swirl cup combustor

the particle image velocimetry (PIV) was applied to measure the spray field of its single head.Through the experiment

the fuel spray characteristics were obtained with different fuel flow distributions and locations of the pilot atomizer.Under the experimental conditions

the results show that:(1) Volume fraction of the droplet size of 80μm is the largest

while volume fraction of the other droplet sizes not equal to 80μm decreases sharply.(2) When the fuel flow increase

the spray quality deteriorates with only pilot fuel atomizer available

and differs little with only primary atomizer available.(3) The fuel spray field of pilot fuel atomizer at swirler outlet has better performance than that of pilot atomizer at throat position.(4) When the pilot and primary fuel atomizer operate at the same time

atomization quality is improved with increase of primary fuel flow rate while inlet fuel air ratio is kept unchanged.