Trailing vortex field transfer based numerical simulation method for multi-aircraft flight formation

Abstract

The invention discloses a trailing vortex field transfer based numerical simulation method for a multi-aircraft flight formation. The method comprises: according to a mathematical model of a surface contour of an aircraft model, generating a front and a rear aircraft computing grid, wherein each of the front and rear aircraft computing grids contains transition block grids that have same topological structures; computing flow field data of a front aircraft in a free boundary state; exporting trailing vortex field data of the transition block grids of the front aircraft after computational convergence of the flow field data of the front aircraft; reading the exported trailing vortex field data of the transition block grids of the front aircraft into the transition block grids of a rear aircraft; and computing flow field data of the rear aircraft by using the read transition block grid data as a boundary condition. According to the method disclosed by the invention, a relatively small number of computing grids are adopted for numerical simulation; and meanwhile, a spoiler field result of a front aircraft model can be used for computing different spanwise / flow positions and different flight attitudes of the rear aircraft, thereby avoiding multi-time computation of the front aircraft model in conventional computing.

Description

technical field [0001] The invention relates to the field of computational fluid dynamics, in particular to a multi-aircraft flight formation numerical simulation method based on wake vortex flow field transfer in multi-block grids. Background technique [0002] Flying formation is a common way of flying in nature. Foreign studies have shown that birds flying in formation can save 11%-14% of energy, and can fly farther than alone. Similar to the flight situation of birds, a pair of counter-rotating wake vortices will also appear at the wingtips during aircraft flight, which will form an upwash on the airflow in a certain area behind. Reasonable use of this upwash effect can effectively reduce the rear vortex. Aircraft induces drag, thereby achieving high flight efficiency. Therefore, flying formations have broad application prospects in reducing drag, improving load and endurance of large aircraft. [0003] The formation, development and dissipation mechanism of the aircr...

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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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