Lateral collision dynamics of CSPRs paired approach under influence of wake vortex field

In order to study lateral collision risk of CSPRS paired approachꎬ firstlyꎬ considering traditional approach motion processꎬ an interval model of paired approaching aircrafts was established to determine theoretical interval between them at any time. Secondlyꎬ characteristics of aircrafts' wake vortex field were analyzed to establish a strength calculation model and dissipation model for leading aircraft 's wake flow. Rear aircraft's response mechanism after encountering wake flow was also studiedꎬ and a torque balance model of it in wake vortex field of leading aircraft was developed to determine safety spacing between them. Thenꎬ lateral positioning error of aircrafts was analyzed to obtain probability distribution of 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 actual interval between paired aircraftsꎬ and a risk calculation model was establishedꎬ which was applied to analyze changes of lateral collision risk between leading and rear aircrafts during paired approach. The results show that lateral collision risk increases with the increase of initial interval and positive side windꎬ and then decreases with the increase of aileron 's deflection angle. It rises to the maximum value when paired aircrafts reach the head of runway.