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首页> 外文期刊>Journal of aerospace engineering >Dynamic Aeroelastic Instabilities of an Aircraft Wing with Underwing Store in Transonic Regime
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Dynamic Aeroelastic Instabilities of an Aircraft Wing with Underwing Store in Transonic Regime

机译：跨音速状态下机翼下机翼的动态气动弹性不稳定性

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The research used the transonic small disturbance theory to better understand the dynamic aeroelastic phenomena and factors that affect the onset of flutter and store induced limit-cycle oscillations (LCO) in the transonic regime. Several parametric studies of the flutter and LCO of an aircraft wing with underwing store in the transonic regime were conducted, as well as an investigation of the effect of inclusion of store aerodynamics on the onset of flutter. The flutter sensitivity was analyzed for the following store parameters: (1) location of underwing store center of gravity with respect to aerodynamic root chord; (2) location of underwing store along the span of the wing; and (3) underwing clearance (pylon length). The parametric studies indicated that as the store center of gravity is moved fore of the elastic axis, the flutter velocity of the wing increased. Also, as the store is moved towards the aerodynamic tip chord, the flutter velocity of the wing decreased. The research work also concluded that as the underwing clearance is increased, the flutter velocity of the wing decreased. In addition to these results, it also helped in understanding that addition of store aerodynamics had no significant influence on the flutter velocity of the wing. Also, studies were conducted to identify the onset of LCO for different configurations of underwing store and flight regimes (unmatched analysis), thereby identifying the parameters that induce LCO. The sensitive parameters that affect flutter and LCO are identified.
机译：该研究使用跨音速小扰动理论来更好地了解动态气动弹性现象和影响颤振发作的因素，并存储跨音速状态下的感应极限循环振荡（LCO）。在跨音速状态下，对具有机翼下存储的飞机机翼的颤振和LCO进行了一些参数研究，并研究了存储空气动力学对颤振发作的影响。针对以下存储参数分析了颤振灵敏度：（1）机翼下存储重心相对于气动根弦的位置； （2）沿机翼跨度的机翼下存放位置； （3）机翼下间隙（吊架长度）。参数研究表明，随着存储重心在弹性轴的前面移动，机翼的扑动速度增加。而且，随着储物箱朝着空气动力翼弦方向移动，机翼的颤动速度降低了。研究工作还得出结论，随着机翼下间隙的增加，机翼的扑动速度降低。除了这些结果之外，它还有助于理解附加的空气动力学特性对机翼的扑动速度没有重大影响。此外，进行了研究以识别不同机翼下机舱和飞行状态配置的LCO发生（无与伦比的分析），从而确定诱导LCO的参数。确定影响颤振和LCO的敏感参数。

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