Research On Wake Encounter Model And Interlaced Parallel Runway Wake Turbulence Separation Optimization

The rapid development of the air transport industry has increased the number of flights at the hub airport.At the same time,it also increases the rate of flights delay.In order to reduce flight delays,more and more hub airports have built Interlaced closely parallel runways.However,at present,China's regulations on wake separation of near parallel runways are too conservative,which seriously restricts the increase of airport capacity.In Chain,the main reason for the conservative standard of interlaced near-parallel runway is that too large wake separation standard is considered.Therefore,it is necessary to study the wake separation of interlaced near-parallel runway.First,the wake evolution mechanism is studied from the aspects of physical models,and its influencing factors are analyzed.The way of the trailing aircraft entering the leading aircraft's wake field is analyzed,and different risk indicators are proposed according to the different ways of entering,and the relevant physical model is established.And then,considering the difference between the leading aircraft's wing calculation model and the actual wing model,a rolling moment coefficient calculation model based on the three-stage swept-back wing was proposed.By comprehensively considering the evolution mechanism of the aircraft wake vortex,the aircraft response and the flight procedure of the final approach segment,an optimization model of wake separation based on environmental crosswind was established and verified.The verification results show that the method presented in this paper is reasonable,the calculation results of the model are reliable,the safety is high,and it can be used to calculate the safety wake separation of parallel runway.Then,according to the influencing factors of the wake separation,Shanghai Hongqiao International Airport was used as the research airport,and the B-type aircraft A330-300 with the largest proportion of approaching aircraft and the D-class aircraft A320-200 with the largest proportion of approaching aircraft were selected.According to the combination of different aircraft types,the trajectory of the tail vortex when the aircraft is inside the ground effect and outside the ground effect is analyzed.The analysis results show that,when the ambient crosswind is greater than the critical crosswind,aircraft approaching in parallel may not need to maintain a wake safety interval.However,the critical crosswind values corresponding to different aircraft combinations are different,and the critical positive crosswind values of the same aircraft combination are also different when inside and outside the ground effect.When the environmental crosswind is less than the critical crosswind,the current wake interval can still be further optimized.Finally,the auxiliary calculation platform of wake separation of parallel runway is built with MATLAB software,and several wake separation parameters are calculated.The results show the applicability of the platform.