Method for assessing aerodynamic heat of air rudder gaps of aircrafts under unsteady state condition

Abstract

The invention discloses a method for assessing aerodynamic heat of air rudder gaps of aircrafts under unsteady state condition. The method comprises the following steps of: 1, obtaining a heat flow onthe surface of outer wall of an aircraft through numerically solving an N-S equation of an aircraft flow field; 2, judging whether an unsteady effect exists in a rudder gap or not and carrying out corresponding processing; 3, obtaining an average heat flow of a steady method at a feature point in a rudder gap area in a plurality of periods; 4, comparing an average heat flow of unsteady method atthe feature point in the plurality of periods, and carrying out corresponding processing according to conditions; 5, obtaining an interference factor in the rudder gap area, and obtaining a piecewiseanalytic function curve, changing along with rudder deflection, of the interference factor by utilizing a curve fitting method; and 6, embedding the piecewise function curve of the interference factorinto an aerodynamic heat engineering calculation program so as to obtain a rudder gap area heat environment result of the aircraft in a set trajectory time period. The method is capable of effectively decreasing the redundancy of assessment results while ensuring the reliability of air rudder gap aerodynamic heat assessment results.

Description

technical field [0001] The invention relates to an aerothermal evaluation method. Background technique [0002] Good control characteristics and maneuverability are very important to the performance of the aircraft, and the air rudder is an important part of the attitude control and stability of the hypersonic aircraft, which makes the hypersonic aircraft inseparable from the design of the air rudder and the frequent use of the air rudder during flight. swing. Due to the structural characteristics and functional requirements, there will inevitably be gaps between the air rudder and the aircraft cabin, such as figure 1 As shown, the air rudder gap area generally includes the part of the air rudder gap that is in contact with the incoming air and the area near the air rudder that is significantly affected by the flow of the air rudder gap. The air rudder gap is often one of the areas with the most complex flow rules and the most severe aerodynamic heating of the aircraft. ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, aiming at the unsteady flow phenomenon in the gap of the air rudder and the frequent swinging of the air rudder when the two types of unsteady problems lead to the aerodynamic thermal evaluation of the gap area of ​​the air rudder The problem is difficult to grasp and the amount of calculation is huge. The present invention proposes an aerodynamic thermal environment design method for the air rudder gap interference area in an unsteady state, which can effectively consider the aerodynamic thermal change characteristics when there is unsteady flow in the air rudder gap , to establish an aerothermal evaluation method for the air rudder gap under the condition of frequent swinging of the air rudder, which can effectively reduce the redundancy of the evaluation while ensuring the reliability of the evaluation under the condition of acceptable computing resource consumption

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