AVT-183 diamond wing flow field characteristics Part 1: Varying leading-edge roughness and the effects on flow separation onset
AVT-183 diamond wing flow field characteristics Part 1: Varying leading-edge roughness and the effects on flow separation onset
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DOI：
10.1016/j.ast.2016.01.002
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发表时间：
2016-10
影响因子：
5.6
通讯作者：
A. Hövelmann;F. Knoth;C. Breitsamter
中科院分区：
文献类型：
--
作者：
A. Hövelmann;F. Knoth;C. Breitsamter
本文介绍了一种前缘后掠角为53°、前缘外形为圆形的菱形翼布局的实验研究。这些分析与北约科学技术组织（STO）任务组AVT-183（应用车辆技术小组）最近进行的工作有关。结果是在低速风洞设施中获得的，包括气动力和力矩以及时间平均表面压力。特别强调的是不同的表面粗糙度的影响，这是应用在机翼前缘的实验分析，以固定湍流边界层特性。结果表明，流动分离的开始和出现的前缘涡是非常敏感的粗糙度高度和任何前缘轮廓修改。通过与自由跃迁情况的比较，得到了合理跳闸和过跳闸两种情况，并对其进行了详细的讨论。此外，测量的可重复性问题进行审查，从短期和长期的角度来看。作为结果，为目标流场条件选择了一个特定的前缘粗糙度，这为AVT-183任务组内的后续流场研究和一般CFD验证提供了基线。
Experimental investigations on a 53° leading-edge sweep diamond wing configuration with rounded leading-edge contour are presented. The analyses pertain to recent work that was conducted within the NATO Science and Technology Organization (STO) task group AVT-183 (Applied Vehicle Technology panel). The results were obtained in a low-speed wind tunnel facility and include aerodynamic forces and moments, and time-averaged surface pressures. Special emphasis is placed on the effects of different surface roughness, which was applied in the experimental analyses at the wing leading edge to fix turbulent boundary-layer characteristics. The results show that the flow separation onset and the emerging leading-edge vortex are very sensitive to the roughness height and any leading-edge contour modification. Compared to the free transition case, both reasonably-tripped and over-tripped cases are obtained, which is discussed in detail. Moreover, measurement repeatability issues are reviewed from a short-term and a long-term perspective. As an outcome, one specific leading-edge roughness is selected for the target flow conditions, which provided the baseline for subsequent flow field investigations and general CFD validation within the task group AVT-183.