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A method for obtaining aerodynamic coefficients

A coefficient, aerodynamic technology, applied in the aerospace field, can solve the problem that the aerodynamic coefficient cannot be used

Pending Publication Date: 2019-03-19
JIANGXI HONGDU AVIATION IND GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the aerodynamic coefficient of the rectangular coordinate system cannot be used in the polar coordinate system, and find out a method for obtaining the aerodynamic coefficient

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  • A method for obtaining aerodynamic coefficients
  • A method for obtaining aerodynamic coefficients
  • A method for obtaining aerodynamic coefficients

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0025] A method for obtaining an aerodynamic coefficient of the present invention comprises the following steps:

[0026] The first step is to obtain the aerodynamic coefficient of the aircraft in the Cartesian coordinate system through wind tunnel tests;

[0027] The second step is to obtain the flight parameters of the aircraft, and obtain the aerodynamic parameters according to the flight parameters; wherein, the flight parameters are the flight speed and flight attitude angle, the aerodynamic parameter is the total angle of attack α ∑ and roll angle Φ;

[0028] The third step, according to the total angle of attack α ∑ Calculate the flight angle of attack α and flight sideslip angle β under the Cartesian coordinate system with the roll angle Φ:

[0029] tanα=tanα ∑ cosΦ

[0030] sinβ=sinα ∑ sinΦ...

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Abstract

A method for obtaining aerodynamic coefficients includes obtaining aerodynamic coefficients of an aircraft; solving to obtain the aerodynamic parameters; calculating the angle of attack alpha and theangle of sideslip beta; and obtaining the interpolation rectangular coordinates aerodynamic coefficients. The aerodynamic coefficients of the polar coordinate system are obtained. Obtaining acceleration and angular acceleration of the aircraft; the flight velocity (as shown in the description) and attitude angle of the aircraft at the next time are obtained; and calculating the aerodynamic coefficients of the vehicle at the next time. The method of the invention saves the development cost and time cost of CFD calculation, wind tunnel test.

Description

technical field [0001] The invention belongs to the field of aerospace, and in particular relates to a method for obtaining an aerodynamic coefficient. Background technique [0002] According to the relationship between the axis system of the aircraft body and the geometric angle of the airflow space, the aerodynamic coefficients used by the aircraft are divided into two systems: Cartesian coordinate system and polar coordinate system. The aerodynamic coefficient of the Cartesian coordinate system changes in two dimensions with the attack angle α and sideslip angle β, and the data points present a matrix distribution in space, such as figure 1 shown. The aerodynamic coefficient in the polar coordinate system varies with the total angle of attack α Σ and the roll angle Φ change in two dimensions, the data points are distributed in a circle in space, the data near the center of the circle is denser, and the data far away from the center of the circle is relatively sparse, su...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCB64F5/60G06F30/15G06F2119/06Y02T90/00
Inventor 罗帅方明恩罗剑波赵小勇綦龙张辉李娟娟栗莉郭靖张吉祥张岩谢立云彭铮
Owner JIANGXI HONGDU AVIATION IND GRP
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