Safety Study of Aircraft Dynamic Wake Encounter Based on QAR Data

In order to study in depth the wake vortex evolution characteristics and wake encounter safety of civil aviation aircraft during flight. This paper combines the aircraft wake model with QAR data to analyze the wake vortex generation and wake vortex dissipation characteristics of the aircraft at different flight altitudes. For the characteristics of ARJ21 with high flat wake and hoisted engine, the aerodynamic model is established using strip method for the simulation solution of wake encounter. The dynamic wake separation of ARJ21 following typical preceding aircraft ERJ190, A320, B763, B773, and A388 was calculated with the roll moment coefficient as the safety index. The results show that the initial intensity of the wake vortex in the cruise phase at high altitude above 9000m is large and lasts for a long distance. The wake vortex sink rate governs the wake separation, the higher the initial intensity of the wake vortex, the smaller the wake separation with the following aircraft. During approach flights, The ARJ21 follows the ERJ190, A320, B763, B773, and A388 in reducing the wake separation by 33.57%, 33.57%, 33.95%, 42.79%, and 46.48% from the ICAO RECAT standard.