某典型飞行器模型俯仰/滚转两自由度耦合动态气动特性

doi:10.7527/S1000-6893.2018.22375

Abstract

Abstract: During high maneuvers at high angle of attack for advanced vehicles, coupled motions of pitch/roll or pitch/yaw may be induced by the interaction between the complex evolution of aerodynamic characteristics and the dramatic change of motion attitudes, displaying the strong multi-degree-of-freedom unsteady aerodynamic characteristics. Therefore, based on the dynamic test devices for two-degree-of-freedom pitch/roll in FL-26 wind tunnel, the unsteady aerodynamic characteristics of the one-degree-of-freedom motion and the two-degree-of-freedom pitch/roll coupled motion for a typical four-generation plane model are investigated. The results show that at around 30° angle of attack, the model occurs lateral deviation with for one-degree-of-freedom roll motion and wing rock of small amplitude. A significant dynamic hysteresis of normal force and pitch moment appears during one-degree-of-freedom pitch oscillation. During two-degree-of-freedom forced pitch/free roll coupled motion and forced pitch/forced-roll coupled motion, the amplitude of the sideslip angle decreases, but there are dynamic hysteresis with multiple hysteresis loops on longitudinal and lateral aerodynamic characteristics, which may induce instability and divergence.

Key words: vehicle, pitch motion, roll motion, unsteady aerodynamic characteristics, two-degree-of-freedom

CLC Number:

V211

ZHAO Zhongliang, YANG Haiyong, MA Shang, JIANG Minghua, LIU Weiliang, LI Yuping, WANG Xiaobing, LI Qian. Unsteady aerodynamic characteristics of two-degree-of-freedom pitch/roll coupled motion for a typical vehicle model[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(12): 122375-122375.

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Unsteady aerodynamic characteristics of two-degree-of-freedom pitch/roll coupled motion for a typical vehicle model

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