Dynamic numerical simulation method for external flow field of multi-element airfoil of airplane

Abstract

The invention relates to a dynamic numerical simulation method for an external flow field of a multi-element airfoil of an airplane. The method comprises the steps that 1, an airplane model with a leading edge slat, a trailing edge flap and the multi-element airfoil is established and imported into fluent software; 2, a vertical descending motion function of the airplane model is constructed and imported into the fluent software; 3, a turbulence model is selected; 4, simulation parameters are set, including fluid parameters, airfoil material parameters, work environment parameters, boundary condition parameters, a dynamic mesh updating model, a solution method and solution precision; 5, the fluent software is run, and a flow parameter variation diagram, including a speed, pressure and temperature variation diagram, of fluid around the airfoil in the vertical descending process of the airplane is acquired. Compared with the prior art, dynamic numerical values of the external flow field in the landing process of the airplane can be effectively acquired, and reference can be conveniently provided for assessment of rising and landing performance of the airplane and design of a high lift device.

Description

Technical field

[0001] The invention relates to a numerical simulation method for the external flow field of an aircraft, in particular to a dynamic numerical simulation method for the external flow field of an aircraft multi-section airfoil. Background technique

[0002] During take-off and landing of an aircraft, because it is close to the ground, it is likely to be affected by ground effects. The so-called ground effect is a hydrodynamic effect that reduces the induced drag of the aircraft while achieving a higher lift-to-drag ratio than flying in the air: when the moving aircraft falls very close to the ground (or water), the entire aircraft body As the pressure difference increases, the lift will increase suddenly. Aircraft usually use lift-increasing devices to increase the lift of the aircraft at low speeds, increase load, increase range, reduce aircraft weight, etc. The lift-increasing devices are mostly composed of leading edge slats, main wings and trailing edge flaps....

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