A method for measuring the rolling risk degree of an aircraft after the aircraft encounters a trailing vortex

Abstract

The invention discloses a method for measuring the rolling risk degree of an airplane after the aircraft encounters a tail vortex. The method comprises the following steps that the initial vortex ringquantity Gamma 0 and the tangential speed V Theta (r) of the front tail vortex are calculated; Based on a strip-shaped band method, simplifying the aircraft into wings, and calculating a trailing vortex induced moment M borne by a rear aircraft; And adopting the rolling torque coefficient RMC to measure the rolling risk degree of the aircraft encountering the tail vortex, and calculating the rolling torque coefficient RMC according to the induced torque M of the tail vortex. According to the method, a strip-shaped band method is used for researching and analyzing wake flow induction torque, an RMC model for measuring the encountering severity degree is established, the RMC value obtained through calculation and the RMC value under the ICAO interval standard have the good fitting degree, the applicability of the model is verified, and the method can be used for safety analysis of an airplane encountering wake flow; The RMC model can provide research basis for wake flow safety intervalstandard reduction between specific aircrafts in operation, so that the safety distance when the aircrafts approach is better provided.

Description

technical field [0001] The invention relates to the technical field of aviation operation safety, in particular to a method for measuring the roll risk degree of an aircraft after encountering a wake vortex. Background technique [0002] The wake vortex is a by-product of the lift generated by the aircraft. It is manifested as a pair of outward and downward rotating vortices rolled up behind the aircraft, and lasts for several minutes behind the aircraft. The strength of the wake vortex is determined by the weight of the aircraft that produces the wake vortex, the flight speed, the shape of the wing, and the length of the wingspan, the most important of which is the weight of the aircraft. The wake vortex strength increases with the increase of aircraft weight, load factor and decrease of flight speed. Such as figure 1 As shown, the wake vortex 2 of the front aircraft 1 may cause the aerodynamic disorder of the rear aircraft 3, and the rear aircraft 3 may not be able to re...

AI Technical Summary

Problems solved by technology

In order to prevent aircraft from encountering wake vortices, relevant organizations such as the Civil Aviation Administration of China, the US Federal Aviation Administration (FAA) and the International Civil Aviation Organization (ICAO) have formulated corresponding wake vortex safety separation standards. Under the conditions, the interval standard is too conservative, which limits the improvement of operating efficiency.

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