Unsteady Wake and Tailplane Loads of the Common Research Model in Low Speed Stall

Unsteady Wake and Tailplane Loads of the Common Research Model in Low Speed Stall
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低速失速常用研究模型的非定常尾流和尾翼载荷

DOI:
10.1007/978-3-030-25253-3_2
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发表时间:
2019
期刊:
Notes on Numerical Fluid Mechanics and Multidisciplinary Design
影响因子:
--
通讯作者:
Krämer
Krämer
中科院分区:
--
文献类型:
--
作者:
Waldmann;Konrath;Krämer

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对NASA通用研究模型飞机外形绕流进行了RANS/LES混合模拟,重点是了解在主翼存在大量分离流时分离尾流与尾翼的相互作用。利用在和获得的流场条件下的PIV数据对CFD数据进行了验证,证实了早期出版物中观察到的DDES模拟的总体令人满意的性能。为了研究低速失速时的流动动力学,对三种迎角下的尾流特性和尾翼力进行了计算。发现分离特性在整个跨度上有所不同。尾流的大小和下洗方向随α值的增大而显著变化。改变后的机翼下洗影响了尾翼入流,尾翼上的载荷波动明显地受到尾流中湍流动能的影响。
Hybrid RANS/LES simulations of the flow around the NASA Common Research Model aircraft configuration were carried out with the focus on understanding the interaction of the separated wake with the tailplane in the presence of massively separated flow on the main wing. Validation of the CFD data using PIV data obtained for the flow conditions at,andwas carried out, confirming the generally satisfactory performance of the DDES simulations observed in earlier publications. As a next step, the wake characteristics and tailplane forces were evaluated for three angles of attack in order to investigate the flow dynamics in low speed stall. The separation characteristics were found to vary over the span. The wake size and downwash direction varied significantly with higher values of. The altered wing downwash influenced the tailplane inflow, with the load fluctuations on the latter being significantly affected by the amount of turbulent kinetic energy present in the wake.
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发表时间: 2009-10
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