Reynolds number effect correction method for longitudinal aerodynamic coefficient of flying wing layout aircraft

Abstract

The invention discloses a Reynolds number effect correction method for a longitudinal aerodynamic coefficient of a flying wing layout aircraft. The method comprises the following steps of: S1, calculating real Reynolds numbers, and selecting a Reynolds number; S2, carrying out longitudinal aerodynamic characteristic simulation and drawing a longitudinal aerodynamic characteristic curve; S3, obtaining key coefficients; S4, drawing a relation curve graph of the key coefficients and the Reynolds numbers; S5, fitting a change relation expression S6, obtaining a simulation key coefficient; S7, performing a wind tunnel experiment on the selected key Reynolds number, and drawing a longitudinal aerodynamic characteristic curve to obtain an experiment key coefficient; S8, obtaining a correction formula according to the simulation key coefficient and the experiment key coefficient; and S9, correcting wind tunnel test data according to the correction formula. The Reynolds number effect correctionmethod provided by the invention is suitable for longitudinal aerodynamic coefficient correction of the flying wing layout aircraft; the process of the method is relatively simple and easy to understand; and high Reynolds number wind tunnel test verification shows that the longitudinal aerodynamic coefficient obtained after correction of the method is closer to a real flight result.

Description

Technical field[0001]The invention relates to the technical field of aerodynamic analysis, in particular to a Reynolds number effect correction method for the longitudinal aerodynamic coefficient of a flying wing layout aircraft.Background technique[0002]Reynolds number is an important dimensionless parameter in fluid mechanics. It represents the ratio of inertial force to viscous force. Different Reynolds numbers usually affect the type of boundary layer, the position of the transition point, the velocity distribution pattern in the boundary layer, the position of the separation point on the object, the shape of the separation and the size of the separation zone, the position of the shock wave, the thickness of the boundary layer, etc., resulting in the aerodynamics of the aircraft. The characteristics change, which in turn affects aircraft performance and handling characteristics. Therefore, the research on the Reynolds number simulation capability and the Reynolds number impact a...

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Problems solved by technology

However, for flying-wing layout aircraft, since there is no empennage, the change of the airflow characteristics of the wing or rudder surface not only affects the drag and maximum lift coefficient, but also has a significant impact on the lift and pitch moment characteristics; at the same time, with the airfoil design technology In order to improve the lift coefficient, most aircraft wings are equipped with curved airfoils, which shortens the linear segment of the aerodynamic characteristic curve, and the use of derivatives in the past has become inappropriate

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