民机极限飞行状态非定常气动力建模

doi:10.7527/S1000-6893.2021.25582

Abstract

Abstract: Loss of control is an important factor causing catastrophic aviation accidents, and may lead to extreme flight conditions with complex nonlinear and unsteady aerodynamic characteristics beyond the normal flight envelope. The CRM civil aircraft is selected in this study to conduct a large amplitude oscillation force measurement experiment under extreme flight conditions, and the unsteady aerodynamic data of the aircraft are obtained. Based on the physical mechanism of flow separation at a high angle of attack and the method of Goman state-space model, the structure of the unsteady aerodynamic model for large civil aircraft under extreme flight conditions is proposed, and the predicted ability of the model is verified. The unsteady aerodynamic model is combined with the aircraft motion equations to form the flow/motion state equations. Analysis of the aerodynamic/motion coupling bifurcation is then conducted to predict the evolution characteristics of the aircraft flight motion under the extreme flight condition. The dynamic characteristics are verified by the wind tunnel model flight experiment. The results show that the structure of the unsteady aerodynamic model can be improved by dividing the state variables reflecting the flow field characteristics of the wing and the horizontal tail, respectively. The improved model can accurately capture the longitudinal unsteady aerodynamic characteristics of civil aircraft, and particularly solve the problem of unsteady modeling of the pitch moment. The bifurcation analysis of nonlinear motions such as the limit cycle oscillation under extreme flight conditions can be accurately predicted; the development and evolution of flight dynamics characteristics under the extreme flight condition can be accurately reproduced and verified through the wind tunnel model flight experiment, thereby providing controlled and repeatable experimental conditions for unsteady aerodynamic modeling and verification of nonlinear flight dynamics analysis results. The research methods and results provide a feasible approach to the study of aerodynamic and kinematic characteristics of civil aircraft under extreme flight conditions, so as to improve the prevention and recovery from loss of control, pilot training with flight simulation and flight accident analysis.

Key words: civil aircraft, extreme flight conditions, Goman-Khrabrov model, bifurcation analysis, flight test

CLC Number:

V211.7

CEN Fei, LIU Zhitao, JIANG Yong, GUO Tianhao, ZHANG Lei, KONG Yinan. Unsteady aerodynamics modeling of civil transport configuration under extreme flight conditions[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(8): 125582-125582.

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Unsteady aerodynamics modeling of civil transport configuration under extreme flight conditions

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