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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Characterisation of uniform momentum zones in adverse pressure gradient turbulent boundary layers
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Characterisation of uniform momentum zones in adverse pressure gradient turbulent boundary layers

机译：不良压力梯度湍流边界层均匀动量区的特征

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摘要

Uniform momentum zones (UMZs) for an adverse pressure gradient turbulent boundary layer (APG-TBL) are characterised in this paper.The database described by Cuvier et al.(2017), which was obtained using 2-component 2-dimensional (2C-2D) particle image velocimetry (PIV) at two free-stream velocities of 5 m/s and 9 m/s, is used for this study.The methodology described by Adrian et al.(2000) is used to identify and hence, statistically characterise the UMZs and UMZ interfaces in the APG-TBL. This study shows that the number of detected UMZs increases in the streamwise direction for both free-stream velocities.This increase is primarily thought to be due to the adverse pressure gradient (APG) since a comparison of the results between the two free-stream velocity APG-TBLs did not show any statistically significant difference with Re-theta for the range of Reynolds number examined in this study.The thickness of the UMZs, delta(w) and the jump in streamwise velocity across the UMZ interface were found to increase in the wall-normal direction, whereas the width of the UMZ interface, Delta(u), was found to decrease.The number of UMZs, N-umz, identified appeared to influence the modal velocities/uniform velocities, geometrical properties of the UMZs and statistics of the flow.With increasing N-umz, the modal velocities of the UMZs moved to higher values to accommodate new UMZs that developed closer to the wall and the thickness of each UMZ and Delta(u) across the UMZ interface decreased, whereas delta(w), increased. A slight difference in the magnitude of streamwise Reynolds stress and Reynolds shear stress was observed in the inner and outer regions, and a slight difference in the magnitude of turbulence production was also observed in the inner region between the velocity fields having a low or high number of UMZs indicating that the flow statistics are influenced by the number of UMZs present in the APG-TBL.
机译：本文的均匀动量区域（UMZS）的特征在于Cuvier等人描述的数据库。（2017），使用2组分二维获得（2c- 2D）粒子图像速度（PIV）在5 m / s和9m / s的两个自由流速度下用于本研究。Adrian等人描述的方法。（2000）用于统计和因此在APG-TBL中表征UMZ和UMZ接口。该研究表明，检测的UMZ的数量在自由流速度的流动方向上增加。这一增加主要被认为是由于不利的压力梯度（APG），因为从两个自由流速度之间的结果进行比较APG-TBL对本研究中检查的Reynolds编号的范围没有显示任何统计学意义的差异。UMZS，Delta（W）的厚度和UMZ接口的流动速度跳跃的厚度增加壁正常方向，而UMZ接口的宽度，发现Δ（U）减少。鉴定的UMZ，N-UMZ的数量似乎影响了模态速度/均匀速度，UMZ的几何特性和统计数据的统计数据。umz的模态速度移动到更高的值，以适应更靠近墙壁的新UMZ和跨越UMZ接口DE的每个UMZ和DELTA（U）的厚度褶皱，而Delta（W），增加。在内部和外部区域观察到流动雷诺应力和雷诺剪切应力的大小的略微差异，并且在具有低或高或高的速度场之间的内部区域中也观察到湍流产生的大小的略微差异UMZ表示流动统计受APG-TBL中存在的UMZ的数量影响。

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