A Numerical Simulation Method for Multi-vehicle Flight Formation Based on Wake Vortex Flow Field Transfer

Abstract

The invention discloses a multi-aircraft flight formation numerical simulation method based on the transfer of the wake vortex flow field. According to the mathematical model of the surface shape of the aircraft model, the calculation grids of the front aircraft and the rear aircraft are respectively generated, and the calculation grids of the front aircraft and the rear aircraft include Transition block grid with the same topology; solve the flow field data of the forward aircraft in the free boundary state; export the wake vortex flow field data of the transition block grid of the forward aircraft after the calculation of the flow field data of the forward aircraft converges; the transition block network of the exported aircraft will be The grid tail vortex flow field data is read into the transition block grid of the rear aircraft; the flow field data of the rear aircraft is calculated using the read transition block grid data as boundary conditions. The method of the present invention uses a small number of calculation grids to carry out numerical simulation, and at the same time, the results of the disturbance field of the model of the front aircraft can be used for the calculation of the position of the rear aircraft in different span / flow directions and different flight attitudes, thereby avoiding the confusion of the model of the front aircraft in conventional calculations. Calculated multiple times.

Description

Technical field [0001] The invention relates to the field of computational fluid dynamics, and in particular to a numerical simulation method for multi-aircraft flight formation based on wake vortex flow field transfer in multiple grids. Background technique [0002] Flying formation is a common way of flying in nature. Foreign studies have shown that birds can save 11%-14% of energy by flying in formation, and can fly longer distances than when they are alone. Similar to the flight situation of birds, a pair of counter-rotating wake vortices will appear at the wingtips during the flight of the aircraft, which will upwash the airflow in a certain area behind. Reasonably use this upwashing effect to effectively reduce the rear. The aircraft induces drag to achieve higher flight efficiency. Therefore, the flight formation has broad application prospects in reducing the drag of large aircraft, increasing the load and endurance and so on. [0003] The formation, development and diss...

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Problems solved by technology

[0004] However, the number of calculation grids for multi-vehicle formation flight is large. In order to ensure the accurate calculation of viscous effects, dense boundary layer grids need to be generated on the surface of the aircraft; the development of the wake vortex and its interaction with the rear aircraft also require very dense grids. Taking a transport aircraft as an example, in order to ensure the accuracy of the calculation, the number of grids required for the formation of the front and rear aircraft is more than tens of millions. If it is necessary to deeply analyze the influence of the wake vortex on the stability of the rear aircraft, the number of calculation grids is larger

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