CFD method based precise acquisition method for elastic pneumatic data

Abstract

The invention provides a CFD method based precise acquisition method for elastic pneumatic data. The method comprises the following steps: 1, establishing a wind tunnel model and a real model of an aircraft; 2, conducting pneumatic elastic property estimation for the wind tunnel model and the real model, and entering the step 3 as the elastic pneumatic data based on the wind tunnel model and the real model is judged to be corrected; 3, carrying out first-time elastic correction: measuring an aerodynamic coefficient of the wind tunnel model by means of a wind tunnel test; calculating the aerodynamic coefficient change amount before and after deformation of the wind tunnel model by adopting the CFD method; subtracting the wind tunnel deformation data and the aerodynamic coefficient change amount to obtain first pneumatic data; and 4, carrying out second-time elastic correction: calculating the aerodynamic coefficient change amount before and after deformation of the wind tunnel model byadopting the CFD method and superposing the aerodynamic coefficient change amount with the first pneumatic data. The two-step elastic pneumatic data precise correction method is established, and the precision of the acquired flying elastic pneumatic data is improved greatly.

Description

Technical field [0001] The invention relates to the technical field of aircraft aeroelasticity, in particular to a method for accurately acquiring elastic aerodynamic data based on a CFD method. Background technique [0002] Aerodynamic data is one of the important basis for evaluating the flight performance and stability of aircraft. In traditional aircraft design, the main source of aerodynamic data is wind tunnel force testing, and the test model is usually made of steel. It is generally believed that the material of steel is relatively rigid, and the deformation of the test piece under aerodynamic load is small. Therefore, the measurement data of the wind tunnel unit is usually not modified and directly used for aircraft design. [0003] With the development of aircraft design towards lighter weight and greater flexibility, the elastic deformation of the airfoil surface with light weight and large aspect ratio is inevitable. Therefore, the traditional aircraft design that beli...

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Problems solved by technology

[0003] With the development of aircraft design towards light weight and high flexibility, the elastic deformation of light-weight and high-aspect-ratio airfoils is inevitable. Therefore, the traditional aircraft design, which considers that elastic deformation has little effect on the aerodynamic performance of the aircraft, can no longer meet the requirements. Modern Advanced Aircraft Design Requirements

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