Experimental study on drag reduction of the turbulent boundary layer via porous media under nonzero pressure gradient

被引:15
作者
Du, Hai [1 ]
Li, Qixuan [2 ]
Zhang, Qinlin [2 ]
Zhang, Wenxiao [1 ]
Yang, Lejie [2 ]
机构
[1] Xihua Univ, Key Lab Fluid & Power Machinery, Minist Educ, Chengdu 610039, Peoples R China
[2] Xihua Univ, Sch Energy & Power Engn, Chengdu 610039, Peoples R China
基金
中国国家自然科学基金;
关键词
SKIN FRICTION; CHANNEL FLOW; WALL; MECHANISMS; VORTICES;
D O I
10.1063/5.0083143
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The complex surface of an aircraft generates a nonzero pressure gradient flow. In this study, the boundary conditions of favorable and adverse pressure gradients are constructed in a small low-turbulence wind tunnel test section. Hot-wire anemometers and time-resolved image velocimetry are used to analyze the flow structure in a fully developed turbulent boundary layer with porous media. The effects of the porous surface on the statistical characteristics of the turbulent flow field and turbulent flow structure are analyzed and discussed. The results show that porous media reduce the velocity gradient in the linear layer, and the friction drag reduction effect is higher downstream of the porous wall. The drag reduction effect decreases along the flow direction. A wall with a 10 pores per inch produces a slightly better drag reduction effect than smooth wall. The maximum local drag reduction effect of a 10-pores-per-inch porous wall is 43.7% under a favorable pressure gradient and 42.3% under an adverse pressure gradient. The velocity streaks in the inner layer show that the porous wall widens the low-velocity streaks, making them more stable, while the high-speed streaks decrease in size under the pressure gradient. In the case of the adverse pressure gradient, the structure of the streaks becomes blurred, and their strength weakens. Under both favorable and adverse pressure gradients, the porous media lift up the coherent structures near the wall, thus weakening the large-scale coherent wall structures.
引用
收藏
页数:16
相关论文
共 40 条
[1]   Drag reduction via turbulent boundary layer flow control [J].
Abbas, Adel ;
Bugeda, Gabriel ;
Ferrer, Esteban ;
Fu, Song ;
Periaux, Jacques ;
Pons-Prats, Jordi ;
Valero, Eusebio ;
Zheng, Yao .
SCIENCE CHINA-TECHNOLOGICAL SCIENCES, 2017, 60 (09) :1281-1290
[2]   Mechanism of control of the near-wall turbulence using a micro-cavity array [J].
Bhat, S. S. ;
Silvestri, A. ;
Cazzolato, B. S. ;
Arjomandi, M. .
PHYSICS OF FLUIDS, 2021, 33 (07)
[3]   Skin-friction drag reduction in the turbulent regime using random-textured hydrophobic surfaces [J].
Bidkar, Rahul A. ;
Leblanc, Luc ;
Kulkarni, Ambarish J. ;
Bahadur, Vaibhav ;
Ceccio, Steven L. ;
Perlin, Marc .
PHYSICS OF FLUIDS, 2014, 26 (08)
[4]   WALL STRUCTURE OF TURBULENT BOUNDARY-LAYER [J].
BLACKWELDER, RF ;
KAPLAN, RE .
JOURNAL OF FLUID MECHANICS, 1976, 76 (JUL14) :89-&
[5]  
Bruneau Charles-Henri, 2014, International Journal of Aerodynamics, V4, P70
[6]   Passive control of the flow around a square cylinder using porous media [J].
Bruneau, CH ;
Mortazavi, L .
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, 2004, 46 (04) :415-433
[7]   Similarity analysis of favorable pressure gradient turbulent boundary layers with eventual quasilaminarization [J].
Cal, Raul Bayoan ;
Castillo, Luciano .
PHYSICS OF FLUIDS, 2008, 20 (10)
[8]   Flow over bio-inspired 3D herringbone wall riblets [J].
Chen, Huawei ;
Rao, Fugang ;
Shang, Xiaopeng ;
Zhang, Deyuan ;
Hagiwara, Ichiro .
EXPERIMENTS IN FLUIDS, 2014, 55 (03)
[9]  
Choi K.S., 2013, AIAA FLOW CONTR C AI, P2216
[10]   TURBULENT BOUNDARY LAYERS IN ADVERSE PRESSURE GRADIENTS [J].
CLAUSER, FH .
JOURNAL OF THE AERONAUTICAL SCIENCES, 1954, 21 (02) :91-108