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作 者:常思源 田中伟 李广利[1,3] 肖尧 崔凯[1,3] CHANG SiYuan;TIAN ZhongWei;LI GuangLi;XIAO Yao;CUI Kai(LHD of Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;WESA of Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China)
机构地区:[1]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190 [2]中国科学院力学研究所宽域飞行工程科学与应用中心,北京100190 [3]中国科学院大学工程科学学院,北京100049
出 处:《中国科学:技术科学》2024年第2期275-288,共14页Scientia Sinica(Technologica)
基 金:国家自然科学基金(批准号:12002347);中国科学院基础前沿科学研究计划(编号:ZDBS-LY-JSC005)资助项目。
摘 要:纵向稳定性是关乎临近空间高超声速飞行器操稳特性、飞行安全和飞行品质的关键因素之一.目前纵向稳定性的研究主要围绕常规单升力面气动布局,而对具备双升力面结构的高压捕获翼新型气动布局,相关研究还有待加强.本文面向一种高压捕获翼飞行器,结合小振幅强迫振荡法、非定常数值模拟方法和最小二乘方法辨识纵向气动导数,详细研究了飞行姿态、振荡参数、来流条件和质心位置等因素的不确定性对飞行器纵向静、动稳定特性的影响规律.研究发现,当平衡攻角从-10°逐渐增大到14°时,纵向静稳定性整体呈现出波动减弱的趋势,而动稳定性却先小幅波动后迅速增强.振荡频率越大时,纵向稳定性越强,但总体影响不太明显;当振荡幅值低于2°时,气动导数的辨识结果相近,而在较大的振荡幅值下,最大攻角附近非定常气动力的迟滞效应显著增强.飞行马赫数增大时,静、动稳定性均显著减弱,且对较小的飞行马赫数比较敏感.飞行高度增大时,静稳定性逐渐减弱但动稳定性却逐渐增强,且均对较大的飞行高度更加敏感.飞行器纵向质心位置的改变主要对静稳定性影响较大,而对动稳定性的影响却相当有限.Longitudinal stability is one of the most important aspects related to the handling and stability characteristics, flight safety, and flightquality of near-space hypersonic vehicles. At present, most research on longitudinal stability characteristics focuses on theconventional aerodynamic layout with a single-lifting surface. Meanwhile, relevant research on the aerodynamic layout of the newhigh-pressure capturing wing (HCW) with a double-lifting surface must be strengthened. In this study, the longitudinal aerodynamicderivatives for an HCW aircraft were predicted by combining the small-amplitude forced oscillation, unsteady numerical simulation,and least square methods. Furthermore, the influence of the uncertainties of flight attitude, oscillation parameters, inflow conditions,and center-of-gravity positions on the longitudinal static and dynamic stability characteristics of the HCW aircraft was examined. Theresults indicate that the longitudinal static stability generally exhibits a trend of weakening fluctuations as the average angle of attackgradually increases from −10° to 14°, while the dynamic stability initially fluctuates slightly and then increases rapidly. Therefore, thelarger the oscillation frequency, the stronger the longitudinal stability, but the overall effect is not evident. When the oscillationamplitude is lower than 2°, the prediction results of the aerodynamic derivatives are similar. However, at a larger oscillationamplitude, the hysteresis effect of unsteady aerodynamic forces near the maximum angle of attack is significantly enhanced.Meanwhile, as the flight Mach number increases, the static and dynamic stability are significantly weakened and become moresensitive to a smaller flight Mach number. When the flight altitude increases, the static stability gradually weakens, but the dynamicstability gradually improves, and both become more sensitive to larger flight altitudes. Static stability is greatly influenced mainly bythe change of the center-of-gravity position of the aircraft, whi
关 键 词:高压捕获翼 数值模拟 纵向稳定性 动稳定导数 不确定性
分 类 号:V211.3[航空宇航科学与技术—航空宇航推进理论与工程] V411.4
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