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首页> 外文期刊>Journal of visualization >Flow topology around a simplified two-wheel landing gear
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Flow topology around a simplified two-wheel landing gear

机译：简化的两轮起落架周围的流动拓扑

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摘要

Flow topology around a simplified model of a two-wheel landing gear is studied using the hydrogen-bubble visualization technique. The complete test model consists of two wheels, an axle, a main strut and a support strut. A number of wheel models with varying geometric details are considered. During the analyses, the flow field around the wheels is divided into three main regions: upper, central and lower. (1) In the upper (wing side) flow region, the flow along the inner side surface of the wheels either remains attached until the wheel aft or it separates prematurely and periodically forms slant vortices in the near wake. The wheel geometry is found to control the type of separation. (2) In the central flow region, comparison of the flow sections above and below the axle shows that main strut blockage has a significant influence on the separation behavior of the flow between the wheels. Furthermore, the addition of interior wells to the wheel geometry is found to result in a cross-stream jet at the level of the axle. This highly-erratic fluid ejection has the potential to be a source of aeroacoustic noise. (3) In the lower (ground side) flow region, the near wake is shown to accommodate periodically forming large-scale structures.
机译：使用氢气泡可视化技术研究了两轮起落架简化模型周围的流动拓扑。完整的测试模型包括两个轮子，一个轮轴，一个主支撑杆和一个支撑支撑杆。考虑了具有不同几何细节的许多车轮模型。在分析过程中，车轮周围的流场分为三个主要区域：上部，中央和下部。 （1）在上部（机翼侧）流动区域中，沿车轮内侧表面的流动会一直保持附着状态，直到车轮向后移动，或者过早分离并在近尾流中周期性地形成倾斜涡旋。发现车轮几何形状可以控制分离类型。 （2）在中心流动区域，比较车轴上方和下方的流动部分表明，主撑杆的堵塞对轮之间的流动的分离行为有重大影响。此外，发现在轮毂几何形状上增加内部凹坑会导致在轮轴水平处产生横流射流。这种高度不稳定的流体喷射有可能成为空气声噪声的来源。 （3）在下部（地面侧）流动区域，显示了近尾流可以容纳周期性形成的大型结构。

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