Research On Taxiing Stability Of Aircraft Running Behind Takeoff Point

At present,most of the typical multi-runway airports in China have runway crossing situations,mainly using front side of the takeoff aircraft and the big U-slip crossing runway method.Compared with these two methods,crossing runway at the rear side of the take-off point operation method is more able to improve the runway operation efficiency and safe.With the increasing number of flights and the construction of multi-runway airports,it is more necessary to improve the crossing runway operation efficiency.The key to promote the runway crossing on the back side of the takeoff point is to determine the safety separation between different combinations of front and rear aircraft types,and the taxiing stability of the rear aircraft during the runway crossing is the key factor affecting the safety separation.In this thesis,the taxiing stability of the rear aircraft under the crossing runway at the rear side of the takeoff point is studied based on CFD numerical simulation.Specific studies include:Firstly,takeoff aircraft front side crossing and big U-slip crossing runway methods are expounded,the advantages of the concept,operation process and implementation conditions of crossing runway at the rear side of the take-off point are introduced,and the advantages of crossing runway at the rear side of the take-off point are compared and analyzed.Secondly,the factors influencing the taxiing stability of the rear aircraft crossing runway at the rear side of the take-off point of the front aircraft are analyzed,mainly including the rear aircraft’s own influencing factors and external influencing factors.and the front and rear aircraft types,separation,the position of the jet acting on the rear aircraft,and the runway surface friction coefficient are determined as the main influencing factors,and the mechanical analysis is carried out based on this.Then,the CFD method is used to model the scenario of the front engine jet acting on the rear engine at a certain distance,and the hybrid meshing method is adopted and the meshindependence of the model is verified,and the numerical simulation results obtained are postprocessed and analyzed,including the pressure and temperature on the surface of the rear engine and the force along the direction of the front engine jet.Finally,combine the numerical simulation results and mechanical theory analysis to anlysis the taxiing stability of the rear aircraft;build a model and use CFX software to conduct numerical simulation to investigate the separation between two aircraft that can maintain the taxiing stability of the rear aircraft.For the case of B737-800 in the front aircraft and B737-800 and A320 in the rear aircraft respectively,the taxiing stability of the rear aircraft under different separation is studied,and the safe separation recommendation is given according to the results.