穿孔对波纹壁流动特性的影响

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2024-11-12 DOI:10.1016/j.expthermflusci.2024.111358

Linmeng Yu , Jiao Sun , Kangfu Sun , Pengda Yuan , Wenyi Chen

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引用次数: 0

摘要

基于二维粒子图像测速仪（PIV）对波纹壁上的流动特性以及穿孔引起的流动变化进行了实验研究，并对波纹壁上穿孔的被动控制机制进行了研究。波纹壁的振幅波长比为 2a/λ = 0.1，波长雷诺数 Reλ = 14400，体积雷诺数 Reb = 17500。穿孔位于波纹壁的第十一周期。结果表明，穿孔增加了再循环区的面积，降低了摩擦阻力的影响，减弱了波纹壁上的湍流强度和雷诺法向应力，但增强了雷诺剪应力。采用 POD 和有限时间 Lyapunov 指数（FTLE）分析涡流结构。从 FTLE 结果可以看出，穿孔扰动了原有的剪切层，并重新分配了流场的涡旋结构。通过重建 POD 模式分解后前 50%和后 50%能量含量的瞬时波动流场，研究穿孔对流场大小尺度结构的影响。研究发现，穿孔对小尺度结构的影响大于对大尺度结构的影响。

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Effect of a perforation on the flow characteristics of corrugated wall

The flow characteristics on a corrugated wall and the variations caused by a perforation are investigated experimentally based on two-dimensional particle image velocimetry (PIV), and the passive control mechanism of the perforation on the corrugated wall is studied. The corrugated wall has an amplitude-to-wavelength ratio 2a/λ = 0.1, with the wavelength Reynolds number Re_λ = 14400 and bulk Reynolds number Re_b = 17500. The perforation is located on the eleventh cycle of the corrugated wall. The results show that perforation increases the area of the recirculation zone, reduces the effect of frictional resistance, weakens the turbulence intensity and the Reynolds normal stress on the corrugated wall, but enhances the Reynolds shear stress. The POD and the Finite-Time Lyapunov Exponent(FTLE) are used to analyze the vortex structures. From the FTLE result, it can be seen that the perforation disturbs the original shear layer and redistributes the vortex structure of the flow field. The instantaneous fluctuating flow field of the first 50 % and the last 50 % of the energy content after POD mode decomposition is reconstructed to study the effect of perforation on on large and small scale structures in the flow field. It is found that the impact of perforation on small-scale structures is greater than that on large-scale structures.

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.