民机极限飞行状态的动态气动力试验与建模

doi:10.7527/S1000-6893.2020.23664

Abstract

Abstract: Loss of control is an important cause of catastrophic aviation accidents, possibly exposing the aircraft under extreme flight conditions with complex nonlinear and unsteady aerodynamic characteristics beyond the normal flight envelope. The dynamic derivative and large amplitude wind tunnel tests under the extreme flight conditions are conducted to analyze the impact factors for dynamic aerodynamics and the nonlinear and unsteady characteristics. Results show that the nonlinear and unsteady characteristics of dynamic aerodynamics are significant in stall to incipient spin regions; for dynamic derivative test and modeling, the impact of the angular velocity of motion can be considered to predict the range of angle of attack of aerodynamic nonlinearity and capture the key characteristics related to the dynamic stability of flight maneuvers; using the Goman-Khrabrov state space model combined with the large amplitude test, the key time constants of the unsteady characteristics in the model can be determined, and the unsteady aerodynamic characteristics in the specific extreme flight state motion can be obtained. The research methods and results provide a promising way for the design and modeling of the dynamic aerodynamic test of civil aircraft under extreme flight conditions.

Key words: wind tunnel tests, civil aircraft, high angle of attack, unsteady aerodynamics, Goman-Khrabrov model

CLC Number:

V211.7

CEN Fei, LI Qing, LIU Zhitao, JIANG Yong, ZHANG Lei. Unsteady aerodynamics test and modeling of civil aircraft under extreme flight conditions[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(8): 123664-123664.

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Unsteady aerodynamics test and modeling of civil aircraft under extreme flight conditions

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