Abstract: Dual Particle Dynamical Analyzer is used to measure the velocity and diameter at different spatial points in the spray zone of the process of air-blast nozzle atomization simultaneously.The so-called rescaled range analysis approach is used to study the time series of the velocity signals, diameters and transit times of droplets in the spray zone. According to the Hurst indexes and fractal dimensions computed from the time series, it has been found that, for any fixed spatial point, the normalized range of measured physical quantities possesses scaling property corresponding to time. Each curve of cumulative deviations relative to mean values is self-affine. The curves of different physical quantities are also self-affine with each other, since their Hurst indexes and fractal dimensions are identical approximately. The results obtained in this paper are consistent with those in the literature in which the turbulent/non-turbulent interface acquired by using the laser-induced fluorescence technique was reported.