Engine Placement Effect on Nonlinear Trim and Stability of Flying Wing Aircraft

Engine Placement Effect on Nonlinear Trim and Stability of Flying Wing Aircraft
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发动机布置对飞翼飞机非线性配平和稳定性的影响

DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Nathan W. Graybeal
Nathan W. Graybeal
中科院分区：
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文献类型：
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作者：
Pezhman Mardanpour;D. Hodges;Ryan Neuhart;Nathan W. Graybeal

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本文利用高空长航时飞机的非线性气动弹性配平和稳定性研究了发动机位置和后掠角对类似于霍滕IV的后掠飞翼颤振特性的影响。对后掠机翼的发散和颤振的分析结果进行了验证，结果非常吻合。此外，模态频率和阻尼得到的Goland机翼被发现在一个新的连续为基础的非定常空气动力学公式的基础上发表的结果非常一致。这种飞机表现出非振荡偏航不稳定性，这是既没有垂尾也没有偏航操纵的飞机所期望的。然而，更重要的是存在一个低频的“身体自由颤振”模式。在研究过程中，飞机重心保持固定，这使得飞机操纵杆在每个发动机位置上都能进行类似的配平，并使沿内翼展的颤振速度变化沿着减小。最大颤振速度出现在发动机位置。
The effects of engine placement and sweep on the flutter characteristics of an aft-swept flying wing resembling the Horten IV are investigated using the Nonlinear Aeroelastic Trim and Stability of HALE Aircraft. The analysis was validated against the published results for divergence and flutter of swept wings and found to be in excellent agreement. Moreover, the modal frequencies and damping obtained for the Goland wing were found in excellent agreement with published results based on a new continuum-based unsteady aerodynamic formulation. This aircraft exhibits a nonoscillatory yawing instability, expected in aircraft with neither a vertical tail nor yaw control. More important, however, is the presence of a low-frequency “body-freedom flutter” mode. The aircraft center of gravity was held fixed during the study, which allowed the aircraft controls to trim similarly for each engine location and minimized flutter speed variations along the inboard span. The maximum flutter speed occurred for engine placem...