Visualization of liquid flow that simulated the air flow in the air blast fuel nozzle was conducted. Enlarged transparent models of the fuel nozzle and refractive index matching were used to measure the internal flow of the nozzle. The flow studied here is swirling and highly three-dimensional. But the flow field was measured by two components PIV, so that the out-of-plane velocity component was lacked. To presume the out-of-plane velocity component, it was assumed that the flow field was symmetrical in every 90 degrees because the model was symmetrical in every 90 degrees. Three dimensional velocity field was calculated and useful data for developing fuel nozzle were obtained.
