A general numerical unsteady non-linear lifting line model for engineering aerodynamics studies
A general numerical unsteady non-linear lifting line model for engineering aerodynamics studies
复制标题
用于工程空气动力学研究的通用数值非定常非线性升力线模型
DOI：
10.1017/aer.2018.57
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
O. S. Gabor
中科院分区：
文献类型：
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作者：
O. S. Gabor
摘要升力线理论被广泛应用于从飞机概念设计到风力发电的各个工程领域。提出了许多不同的模式，每一种模式都是为特定目的而设计的，因此适用范围相当狭窄。本文提出了一种通用升力线模型，它能精确地分析涉及升力面的各种工程问题，包括定常和非定常情况。它可用于具有后掠、上反角、扭转和小翼的升力面，包括非线性粘性修正、非定常和准定常力计算、通过虚拟时间推进的稳定尾流松弛以及尾流拉伸和耗散等功能。可能的应用包括低速飞机和无人机的机翼设计，高频鸟类扑翼飞行或风力涡轮机叶片设计和分析的研究。进行了几个验证研究，稳态和非稳态，该方法显示出良好的一致性与实验数据或计算更昂贵的方法获得的数值结果。
ABSTRACT The lifting-line theory is widely used for obtaining aerodynamic performance results in various engineering fields, from aircraft conceptual design to wind-power generation. Many different models were proposed, each tailored for a specific purpose, thus having a rather narrow applicability range. This paper presents a general lifting-line model capable of accurately analysing a wide range of engineering problems involving lifting surfaces, both steady-state and unsteady cases. It can be used for lifting surface with sweep, dihedral, twisting and winglets and includes features such as non-linear viscous corrections, unsteady and quasi-steady force calculation, stable wake relaxation through fictitious time marching and wake stretching and dissipation. Possible applications include wing design for low-speed aircraft and unmanned aerial vehicles, the study of high-frequency avian flapping flight or wind-turbine blade design and analysis. Several validation studies are performed, both steady-state and unsteady, the method showing good agreement with experimental data or numerical results obtained with more computationally expensive methods.