Far-Field Drag Decomposition for Unsteady Flows.
Far-Field Drag Decomposition for Unsteady Flows.
复制标题
非定常流的远场阻力分解。
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
D. Bailly
中科院分区：
文献类型：
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作者：
H. Toubin;D. Bailly
远场分解方法是精确计算飞机受力的最有效手段之一。它们允许区分与各种物理现象有关的阻力分量：激波、粘性干扰和升力诱导涡流，但还不适合应用于非定常构型。例如，货车德沃伦和德斯塔拉克开发了一种在工业上广泛使用的强大而可靠的方法，但仅限于稳定流。本文将此公式推广到非定常流。该演示依赖于强大的理论背景，并仅允许将阻力分解为三个常见分量。将此新的非定常公式应用于OAT 15A翼型的抖振，然后应用于NACA 0012翼型的大迎角自然涡脱落。分析了结果，并与唯一的其他配方，可打破非定常流的阻力。
Far-field decomposition methods are among the most powerful means to accurately compute the forces on an aircraft. They allow distinguishing between the drag components associated with the various physical phenomena: shock waves, viscous interactions and lift-induced vortex, without yet being fit to apply to unsteady configurations. Van der Vooren and Destarac have for example developed a powerful and reliable method used widely in the industry but restricted to steady flows. This paper presents a generalization to unsteady flows of this formulation. The demonstration relies on a strong theoretical background and allows the breakdown of drag into the three usual components only. This new unsteady formulation is applied to an OAT15A profile with buffeting, then to a NACA0012 profile at high angle of attack with natural vortex shedding. The results are analyzed and compared to the only other formulation available to break down the drag of unsteady flows.