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本文设计了具有相同平均沟槽密度的三种排列类型的一维沟槽结构: 密排列、周期间隔排列和两种准周期间隔排列, 并采用数值模拟和实验验证相结合的方法研究了一维沟槽结构在不同排列下的流体减阻特性. 模拟计算分析流场特征和总阻力, 发现相对于密排列和周期间隔排列的沟槽结构, 准周期间隔排列具有更好的减阻特性, 并且这一结果得到减阻实验的验证. 通过流场分布特性进一步分析沟槽结构的减阻机理. 机理分析发现高速流在经一维准周期结构的扰动波调制后形成了准周期间隔排列的速度条纹相, 这有效地抑制了大涡在流向和展向上的形成, 从而实现较大幅度的减阻. 同时对比分析沟槽排列结构调制展向涡和流向涡各自对流动减阻的贡献, 结果表明, 调制流向涡对减阻的作用更大.We design three types of groove structures which are arranged in closely-packedarry (space free), periodic and quasiperiodic orders. The drag reduction properties of these structures are studied by numerical simulations and experimental shear stress measurements. Particularly, the effect of groove arrangement on the drag reduction is elucidated. Based on both the numerical and experimental results, it is found that the quasiperiodic arrangement can obtain more effective drag reduction than the close-packed groove structure and periodic structure. The underlying mechanism of the drag reduction is analyzed by vortex redistribution caused by the groove structures. The high-speed flow can be modulated by the disturbance wave resulting from the quasi-periodic groove structure, forming stripe-like flow patterns arranged in quasiperiodic style. This restrains the formation of big vortex in both the spanwise and the streamwise directions, hence leading to substantial drag reduction. Furthermore, the modulation effect on the streamwise vortex is more remarkable than on spanwise vortex, suggesting that the modulation of streamwise vortex plays a more important role in the drag reduction.
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Keywords:
- drag reduction /
- groove structure /
- quasiperiod
[1] Philips A B, Turnock S R, Furlong M 2010 Journal of Engineering for the Maritime Environment 224 239
[2] Viswanath P R 2002 Progress in Aerospace Sciences 38 571
[3] Ke G X, Pan G, Huang Q G, Hu H B, Liu Z Y 2009 Advances in Mechanics 39 5 (in Chinese) [柯贵喜, 潘光, 黄桥高, 胡海豹, 刘占一 2009 力学进展 39 5]
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[27] Bacher E V, Smith C R 1985 AIAA Paper 85 0548
[28] Xue W H, Geng X G, Li F, Li J, Wu J 2010 Chin. Phys. Lett. 27 104703
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[1] Philips A B, Turnock S R, Furlong M 2010 Journal of Engineering for the Maritime Environment 224 239
[2] Viswanath P R 2002 Progress in Aerospace Sciences 38 571
[3] Ke G X, Pan G, Huang Q G, Hu H B, Liu Z Y 2009 Advances in Mechanics 39 5 (in Chinese) [柯贵喜, 潘光, 黄桥高, 胡海豹, 刘占一 2009 力学进展 39 5]
[4] Iaccarino G, Shaqfeh E S G, Dubief Y 2010 J. Non-Newtonian Fluid Mech 165 376
[5] Elyukhina I, Khomyakov A 2011 J. Phys.: Conf. Ser 318 092013
[6] McHale G, Newton M I, Shirtcliffe N J 2010 Soft Matter 6 714
[7] Wang X L, Di Q F, Zhang R L, Ding W P, Gong W, Chen Y C 2012 Acta Phys. Sin. 61 216801 (in Chinese) [王新亮, 狄勤丰, 张任良, 丁伟朋, 龚玮, 程毅翀 2012 61 216801]
[8] Jung Y C, Bhushan B 2010 J. Phys.: Condens. Matter 22 035104
[9] Bhushan B, Jung Y C 2011 Progress in Materials Science 56 1
[10] Malaspina D C, Schulz E P, Alarcón L M, Frechero M A, Appignanesi G A 2010 The European Physical Journal E 32 35
[11] Ceccio S L 2010 Annual Review of Fluid Mechanics 42 183
[12] Choi J, Jeon W P, Choi H 2006 Phys. of Fluids 18 041702
[13] Walsh M J 1982 AIAA 82 0169
[14] Lee S J, Lim H C, Han M, Lee S S 2005 Fluid Dynamics Research 37 246
[15] Zhang C C, Wang J, Shang Y G 2010 Science China Technological Sciences 53 2954
[16] Park S R, Wallace J M 1994 AIAA J. 32 31
[17] Choi K S 1989 J. Fluid Mech. 208 417
[18] Minetti A E, Machtsiras G, Masters J C 2009 Journal of Biomechanics 42 2188-2190
[19] Sun M, Tian J, Li Z Y, Cheng B Y, Zhang D Z, Jin A Z, Yang H F 2006 Chin. Phys. Lett. 23 486
[20] Zhou P Q, Dong C H, Cao Y J 2006 Acta Phys. Sin. 55 6470 (in Chinese) [周培勤, 董纯红, 曹永军 2006 55 6470]
[21] Shechtman D, Blech I A, Gratias D, Chan J W 1984 Phys. Rev. Lett. 53 1951
[22] Zhang M, Geng X G, Zhang Y, Wang X N 2012 Acta Phys. Sin. 61 194702 (in Chinese) [张盟, 耿兴国, 张瑶, 王晓娜 2006 61 194702]
[23] Gao P, Geng X G, Ou X L, Xue W H 2009 Acta Phys. Sin. 58 421 (in Chinese) [高鹏, 耿兴国, 欧修龙, 薛文辉 2009 58 421]
[24] Guo K X 2004 Quasiperiodic Crystals (Hangzhou: Zhejiang Science and Technology Press) 12 p 70 (in Chinese) [郭可信 2004 准晶研究 (杭州: 浙江科学技术出版社) 12 p70]
[25] Choi K S 2006 Nature 440 754
[26] Fransson J H M, Talamelli A, Brandt L, Cossu C 2006 Phys. Rev. Lett. 96 064501
[27] Bacher E V, Smith C R 1985 AIAA Paper 85 0548
[28] Xue W H, Geng X G, Li F, Li J, Wu J 2010 Chin. Phys. Lett. 27 104703
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