北京航空航天大学学报 ›› 2020, Vol. 46 ›› Issue (1): 77-85.doi: 10.13700/j.bh.1001-5965.2019.0188

• 论文 • 上一篇    下一篇

基于气动导数的类X-37B飞行器纵向稳定性分析

张庆1, 叶正寅2   

  1. 1. 西安航空学院 飞行器学院, 西安 710077;
    2. 西北工业大学 航空学院, 西安 710072
  • 收稿日期:2019-04-28 发布日期:2020-01-21
  • 通讯作者: 叶正寅 E-mail:yezy@nwpu.edu.cn
  • 作者简介:张庆,男,博士,讲师。主要研究方向:微型飞行器气动布局设计、超声速机翼优化设计;叶正寅,男,博士,教授,博士生导师。主要研究方向:飞行器气动弹性力学、非定常空气动力学。
  • 基金资助:
    国家“863”计划(2014AA7060201);国家自然科学基金(11732013);陕西省自然科学基础研究计划(2019JM-290)

Longitudinal stability analysis for X-37B like trans-atmospheric orbital test vehicle based on aerodynamic derivatives

ZHANG Qing1, YE Zhengyin2   

  1. 1. School of Aircraft, Xi'an Aeronautical University, Xi'an 710077, China;
    2. School of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2019-04-28 Published:2020-01-21
  • Supported by:
    National High-tech Research and Development Program of China (2014AA7060201); National Natural Science Foundation of[JP2]China (11732013); Shaanxi Provincial Research Foundation for Basic Research on Natural Science, China (2019JM-290)

摘要: 为了定量地研究跨大气层轨道飞行器在不同飞行条件下俯仰方向的动态特性,在Etkin气动力模型的基础上,详细研究了飞行马赫数、减缩频率、振动幅值、平均迎角等因素对此类飞行器纵向动态特性的影响规律。研究结果表明,平均迎角和飞行马赫数决定了流场的基本特性,所以对气动导数的影响很大;而减缩频率和振动幅值决定了非定常扰动的强弱,影响非定常气动力的大小,决定非定常迟滞效应的强弱。对类似X-37B的跨大气层轨道飞行器来说,平均迎角越大,机身后方背风区的涡流作用越强,纵向稳定性越强。在亚声速范围内,随着飞行马赫数增加,纵向稳定性增强,在超声速范围内,随着飞行马赫数增大,纵向稳定性减弱。振动幅值大小虽然影响了流场的形态,但对气动导数的数值大小没有明显影响。振动频率对动态特性的影响也不明显。希望研究结果可为中国未来类似飞行器的研究和发展提供相应的参考和技术储备。

关键词: 气动导数, 动态特性, 飞行包线, 不确定性, 跨大气层飞行器

Abstract: In order to quantitatively examine the dynamic characteristics in pitching direction of the tans-atmospheric orbiter under different flight conditions, on the basis of the Etkin aerodynamic model, the effects of Mach number, reduced frequency, oscillation amplitude, and average angle of attack on longitudinal dynamic performance of the orbiter were studied in detail. The results show that the average angle of attack and the Mach number determine the basic characteristics of the flow filed, so they have a great effect on the aerodynamic derivatives. The reduced frequency and oscillation amplitude determine the strength of the unsteady disturbance and that of the unsteady hysteresis effect, so they have a great effect on the unsteady aerodynamic forces. For X-37B like trans-atmospheric orbiter, with the increase of the average angle of attack, the effect of the vortical structure at the leeward side of the afterbody is larger and the longitudinal stability is increased. In the subsonic range, as the Mach number increases, the stability increases, and in the supersonic range, as the Mach number increases, the stability decreases. Although the amplitude has some effects on the flow field, it has no significant effect on the value of the aerodynamic derivative. The influence of oscillation frequency on dynamic characteristics is also not obvious. And we hope that these conclusions would provide some technical guidelines and reference for the future research and development of similar vehicle in China.

Key words: aerodynamic derivative, dynamic characteristics, flight envelope, uncertainty, trans-atmospheric orbiter

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