A construction method of formation flight hybrid performance function based on wind tunnel test data

Abstract

The invention discloses a formation flight hybrid performance function construction method based on wind tunnel test data. The method comprises steps of (1) acquiring the aerodynamic force and momentparameters of a rear aircraft under different formation patterns of formation flight through a wind tunnel test or numerical calculation; (2) selecting a priori function to establish a mixed functionmodel; (3) solving a mixed function weight vector by using a least square method; (4) acquiring a hybrid performance function based on prior aerodynamic moment in the formation flight process; and (5)estimating the extreme value position of the rear machine aerodynamic force by utilizing the extreme value position of the hybrid performance function. The formation flight hybrid performance function construction method based on the wind tunnel test data is advantaged in that the experimental data obtained by carrying out the dual-aircraft formation flight test in a high-speed wind tunnel is utilized, the hybrid performance function is combined, the minimum resistance position of the rear aircraft during dual-aircraft formation flight is predicted, flight practice can be guided, and the method has the advantages of being high in reliability and good in economical efficiency.

Description

technical field [0001] The invention belongs to the field of aircraft formation flight research, and in particular relates to a method for constructing a formation flight mixed performance function based on wind tunnel test data. Background technique [0002] Increasing lift and reducing drag is the eternal pursuit of fluid mechanics researchers and aircraft designers, and drag reduction is also consistent with today's pursuit of environmental protection, fuel economy and other flight goals. Drag directly affects the load capacity and fuel carrying capacity of the aircraft, thus affecting the performance and economy of the aircraft. For example, for the C-5 aircraft of the United States, the reduction of the drag coefficient of 0.0001 (one drag unit) can increase the load capacity of the C-5 aircraft by 454 kg. After more than 70 years of development, the performance of the latest aircraft (such as Airbus's A380 or Boeing's B787) based on the existing layout has been greatl...

AI Technical Summary

Problems solved by technology

From another perspective, on the basis of the existing shape, if there is no substantial breakthrough, every reduction of one resistance unit will become a huge challenge

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