Simulation Research On The Risk Of Aircraft Wake Encounter In En-route Stage

In recent years,with the increasing air traffic flow,the types of aircraft operating in the airspace and the degree of traffic mixture have increased significantly,and safety accidents caused by wake vortices have occurred frequently during the flight phase.An assessment of the risk of wake encounters during the en-route phase is necessary.Focusing on the generation,evolution and response of wake encounters,this thesis studies the risk of wake encounters during aircraft operation in the en-route stage.The main research work of the thesis includes:Firstly,the generation and dissipation characteristics of wake are studied.Combined with the research status at home and abroad,the generation and evolution characteristics of aircraft wake are studied through mathematical models,and the influencing factors of wake evolution are analyzed;The characteristics of different wake induced velocity models are compared and analyzed,and the appropriate model is selected to study the wake encounter response;At the same time,according to the operating characteristics of the aircraft in the en-route stage,the wake dissipation of different heights,different weights and different aircraft types is studied.Secondly,summarize the wake encounter scenarios that the aircraft may appear in the enroute stage,and use the strip method in aerodynamics,combined with the specific aircraft type,to construct the overall wake encounter response model of the aircraft,and the MATLAB simulation software is used to calculate the change of lift force and rolling moment when the rear aircraft enters different positions of the wake vortex field of the front aircraft,and determine the most dangerous position in the wake vortex field of the front aircraft.Then,the safety indicators to measure the risk of wake encounter are selected and analyzed.Based on the wake separation standard of RECAT-CN,the maximum value of the rolling moment coefficient,height variation and turbulence intensity of different aircraft combinations at different separations are calculated through simulation,so as to evaluate the potential risk of wake encounter in the route stage.Finally,the factors affecting the wake safety separation are summarized,and the critical safety separation encountered by the wake in the route stage is calculated according to the limit value of rolling torque coefficient of different aircraft types,and compared with the RECATCN wake separation standard.Combined with the sinking motion of the wake vortex,the longitudinal and vertical separation that need to be maintained for different aircraft combinations during flight in the en route stage are summarized.Through the above work,this thesis intends to provide theoretical and experimental basis for studying the risk of wake encounter,formulating scientific and reasonable wake separation standards,and providing reference for formulating more optimized aircraft route stage operation standards.