旋转光滑直通道湍流流动二维热线实验

由儒全; 李海旺; 魏宽; 陶智; 徐国强

doi:10.13224/j.cnki.jasp.2017.07.006

旋转光滑直通道湍流流动二维热线实验

doi: 10.13224/j.cnki.jasp.2017.07.006

1.
北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191
2.
北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191；先进航空发动机协同创新中心，北京 100191

基金项目: 国家自然科学基金（51541605）

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出版历程
- 收稿日期: 2016-12-06
- 刊出日期: 2017-07-28

Experiment of turbulent flow in rotating smooth channel using two-dimensional hotwire

摘要

摘要: 采用二维热线测量了旋转光滑直通道内不同流向位置上的平均速度和雷诺应力。实验结果表明：较高的当地旋转参数使得旋转对平均速度的影响区域扩大并且导致了前缘面附近湍流流动的再层流化。后缘面附近无量纲主流平均速度型严格按照旋转数顺序依次排列，且在对数律区呈现对数律分布。与此同时，所有无量纲雷诺应力分量在后缘面附近基本不受旋转影响。再层流化导致了前缘面附近无量纲主流平均速度型无法在对数律区维持对数律分布，且所有雷诺应力分量都随着旋转数和流向位置半径增大不断衰减；经过u-v象限分析，再层流化现象的直接原因被归于湍流脉动生成减少。
- 旋转通道 /
- 二维热线 /
- 当地旋转参数 /
- 平均速度 /
- 雷诺应力 /
- 再层流化
Abstract: The averaged velocities and Reynolds stresses were measured at different streamwise positions of a rotating smooth channel with two-dimensional hotwire. The results revealed that: the relatively high local rotation parameter expanded the influence region of rotation on the averaged velocity and induced the relaminarization of the turbulent flow near the leading side. The normalized averaged velocity profiles near the trailing side were strictly arranged in the rotation number order, and presented a logarithmic distribution in the log-law region. Meanwhile, all normalized Reynolds stress components were immune to rotation near the trailing side. Owing to the relaminarization, the normalized averaged velocity profiles near the leading side cannot maintain the logarithmic distribution in the log-law region, and all Reynolds stress components decayed with the growing rotation number and radius of the streamwise position. With the u-v quadrant analysis, the immediate reason of the relaminarization was attributed to the reduction of the generation of turbulent fluctuation.
- rotating channel /
- two-dimensional hotwire /
- local rotation parameter /
- averaged velocity /
- Reynolds stress /
- relaminarization

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