| 徐凯池1，张佳琪2.流体微团作用与流动结构变化试验分析[J].航空发动机,2020,46(2):71-74 |
| 流体微团作用与流动结构变化试验分析 |
| Test Analysis of Fluid Micelle Action and Flow Structure Change |
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| DOI： |
| 中文关键词: 湍流流动结构 粒子图像测速 本征正交分解 航空发动机 |
| 英文关键词:turbulent flow structure Particle Image Velocimetry proper orthogonal decomposition aeroengine |
| 基金项目:航空动力基础研究项目资助 |
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| 中文摘要: |
| 为了分析湍流流动中流体微团所受作用与流动结构变化之间的关系，在槽道湍流边界层中通过粒子图像测速（PIV）技
术，拍摄流向- 展向平面流场，采用本征正交分解方法提取湍流流动中不同尺度的含能结构。采用矢量象限组合分析方法，将流场
中流体微团所受作用分为肿胀作用、弯曲作用和旋转作用。结果表明：流动结构变化机理与这3 种作用相关；肿胀型条带间流体微
团受到的主要作用是弯曲作用，在弯曲作用下直条带会弯曲，弯曲条带在肿胀作用下汇聚成肿胀型条带；随着流动结构尺度减小，
旋转作用逐渐增大。 |
| 英文摘要: |
| In order to study the relationship between the action of fluid micelle and the change of flow structure in turbulent flow，the
flow-to-spread plane flow field was captured by Particle Image Velocimetry (PIV) technique in the turbulent boundary layer of the channel.
Energy-bearing structures at different scales in turbulent flow were extracted by means of proper orthogonal decomposition. By means of
vector quadrant combined analysis，the actions of fluid micelle in the flow field were divided into swelling，bending and rotation. The results
show that the mechanism of flow structure change is related to these three actions. The main action of the fluid micelle between the swelling
bands is bending. The straight band bends under the action of bending，and the bending band converges into a swelling band under the
action of swelling. As the scale of the flow structure decreases，the rotation gradually increases. |
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