Passive control on flow past a circular cylinder with bionic nylon wires
-
摘要: 通过风洞实验研究了鸟类羽毛仿生尼龙丝对圆柱绕流场的控制效果及机理。仿生尼龙丝布置于圆柱的前驻点，雷诺数为2.67 × 104，特征变量为尼龙丝长度与圆柱直径之比L/D。采用表面压力测量系统获取圆柱表面压力系数以分析圆柱周围的空气动力。利用高速粒子图像测速（PIV）系统获取圆柱的二维流场信息，并将获取的信息进行本征正交分解（POD），得到流场瞬时特性和时均特性。实验结果表明：L/D < 0.6时，由尼龙丝诱导产生的旋涡无法到达尾流场，此时尼龙丝的控制效果受到限制；L/D > 1.0时，尼龙丝可以显著降低圆柱尾流场的湍动能和雷诺应力，并抑制圆柱的升力系数和阻力系数；当L/D足够大时，尼龙丝可以抑制剪切层之间的相互接触，从而改变圆柱的卡门涡街旋涡脱落模式。Abstract: We investigated the control effectiveness and mechanism of the control of the circular cylinder flow field using bionic nylon wires inspired by bird feathers by wind tunnel tests. In this experiment, at a Reynolds number of 2.67 × 104, the bionic nylon filament was arranged at the front station of the cylinder and the length ratio L/D between nylon wire length and cylinder diameter was used as the characteristic parameter. The surface pressure measurement system was used to obtain the pressure coefficients around the cylinder to analyze the aerodynamic forces acting on the cylinder. The two-dimensional flow field information of the cylinder was obtained by a high-speed Particle Image Velocimetry (PIV) measurement system, and the Proper Orthogonal Decomposition (POD) was used to obtain the instantaneous and time-averaged characteristics of the flow field. The results show that at L/D < 0.6, the control effectiveness of nylon wires is limited because the nylon-induced vortex structures cannot reach the wake field. At L/D > 1.0, the nylon wires can significantly reduce the turbulent kinetic energy and Reynolds stress of the cylindrical wake field and suppress the lift and drag coefficient distributions around the circular cylinder. And at high values, nylon wires can inhibit the interaction between shear layers and thus change the von Kármán vortex shedding pattern of the cylinder.
-
图 5 无控和控制工况下的圆柱表面压力分布
Figure 5. Pressure distributions around the baseline and controlled circular cylinder model
图 6 无控和控制工况下圆柱非稳态升力系数的功率谱分析
Figure 6. Frequency spectrum analysis of the nonstationary lift coefficients about the cylindrical model with controlled and baseline cases
图 7 无控和控制工况下的圆柱升力系数和阻力系数
Figure 7. Drag and lift coefficients acting on the baseline and controlled circular cylinder model
图 8 PIV系统获得的瞬时涡量结构演变图
Figure 8. Instantaneous flow structures evolution measured by PIV measurement system
图 9 无控和控制工况下的湍动能分布和时均尾流场
Figure 9. TKE distributions and time-averaged wake field about the baseline and controlled circular cylinder model
图 10 无控和控制工况下的尼龙丝变形
Figure 10. The nylon wires' deformation of the baseline and controlled circular cylinder model
图 11 无控和控制工况下的圆柱尾流场的雷诺剪切应力分布
Figure 11. RSS concentrations in the wake field about the baseline and controlled circular cylinder model
-
[1] 陈政清. 桥梁风工程[M]. 北京: 人民交通出版社, 2005.CHEN Z Q. Bridge wind engineering[M]. Beijing: China Communications Press, 2005. [2] 刘庆宽, 孙一飞, 张磊杰, 等. 凹痕对斜拉桥斜拉索气动性能影响研究[J]. 工程力学, 2019, 36(S1): 272–277. doi: 10.6052/j.issn.1000-4750.2018.05.S053LIU Q K, SUN Y F, ZHANG L J, et al. Study on the influence of dent on aerodynamic performance of stay cables of cable-stayed bridge[J]. Engineering Mechanics, 2019, 36(S1): 272–277. doi: 10.6052/j.issn.1000-4750.2018.05.S053 [3] 董欣, 丁洁民, 邹云峰, 等. 倒角化处理对于矩形高层建筑风荷载特性的影响机理研究[J]. 工程力学, 2021, 38(6): 151–162, 208. doi: 10.6052/j.issn.1000-4750.2020.07.0451DONG X, DING J M, ZOU Y F, et al. Effect of rounded corners on wind load characteristics of rectangular tall buildings[J]. Engineering Mechanics, 2021, 38(6): 151–162, 208. doi: 10.6052/j.issn.1000-4750.2020.07.0451 [4] CHOI H, JEON W P, KIM J. Control of flow over a bluff body[J]. Annual Review of Fluid Mechanics, 2008, 40: 113–139. doi: 10.1146/annurev.fluid.39.050905.110149 [5] GAO D L, MENG H, HUANG Y W, et al. Active flow control of the dynamic wake behind a square cylinder using combined jets at the front and rear stagnation points[J]. Physics of Fluids, 2021, 33(4): 047101. doi: 10.1063/5.0043191 [6] YU H Y, CHEN W L, XU Z H, et al. Wake stabilization behind a cylinder by secondary flow over the leeward surface[J]. Physics of Fluids, 2022, 34(5): 055110. doi: 10.1063/5.0090797 [7] BEARMAN P, BRANKOVIĆ M. Experimental studies of passive control of vortex-induced vibration[J]. European Journal of Mechanics - B, 2004, 23(1): 9–15. doi: 10.1016/j.euromechflu.2003.06.002 [8] ZHOU B, WANG X K, GUO W, et al. Control of flow past a dimpled circular cylinder[J]. Experimental Thermal and Fluid Science, 2015, 69: 19–26. doi: 10.1016/j.expthermflusci.2015.07.020 [9] ZHOU X, WANG J J, HU Y. Experimental investigation on the flow around a circular cylinder with upstream splitter plate[J]. Journal of Visualization, 2019, 22(4): 683–695. doi: 10.1007/s12650-019-00560-x [10] GAO D L, HUANG Y W, CHEN W L, et al. Control of circular cylinder flow via bilateral splitter plates[J]. Physics of Fluids, 2019, 31(5): 057105. doi: 10.1063/1.5097309 [11] GAO D L, CHEN W L, LI H, et al. Flow around a circular cylinder with slit[J]. Experimental Thermal and Fluid Science, 2017, 82: 287–301. doi: 10.1016/j.expthermflusci.2016.11.025 [12] KO N W M, LEUNG Y C, CHEN J J J. Flow past V-groove circular cylinders[J]. AIAA Journal, 1987, 25(6): 806–811. doi: 10.2514/3.9704 [13] LIM H C, LEE S J. Flow control of circular cylinders with longitudinal grooved surfaces[J]. AIAA Journal, 2002, 40(10): 2027–2036. doi: 10.2514/2.1535 [14] HUANG S. VIV suppression of a two-degree-of-freedom circular cylinder and drag reduction of a fixed circular cylinder by the use of helical grooves[J]. Journal of Fluids and Structures, 2011, 27(7): 1124–1133. doi: 10.1016/j.jfluidstructs.2011.07.005 [15] CHAUHAN M K, DUTTA S, MORE B S, et al. Experimental investigation of flow over a square cylinder with an attached splitter plate at intermediate Reynolds number[J]. Journal of Fluids and Structures, 2018, 76: 319–335. doi: 10.1016/j.jfluidstructs.2017.10.012 [16] SAHU T R, FURQUAN M, JAISWAL Y, et al. Flow-induced vibration of a circular cylinder with rigid splitter plate[J]. Journal of Fluids and Structures, 2019, 89: 244–256. doi: 10.1016/j.jfluidstructs.2019.03.015 [17] BOCANEGRA EVANS H, HAMED A M, GORUMLU S, et al. Engineered bio-inspired coating for passive flow control[J]. Proceedings of the National Academy of Sciences of the United States of America, 2018, 115(6): 1210–1214. doi: 10.1073/pnas.1715567115 [18] BRÜCKER C. Interaction of flexible surface hairs with near-wall turbulence[J]. Journal of Physics: Condensed Matter, 2011, 23(18): 184120. doi: 10.1088/0953-8984/23/18/184120 [19] TALBOYS E, GEYER T F, BRÜCKER C. An aeroacoustic investigation into the effect of self-oscillating trailing edge flaplets[J]. Journal of Fluids and Structures, 2019, 91: 102598. doi: 10.1016/j.jfluidstructs.2019.02.014 [20] KUNZE S, BRÜCKER C. Control of vortex shedding on a circular cylinder using self-adaptive hairy-flaps[J]. Comptes Rendus Mécanique, 2012, 340(1-2): 41–56. doi: 10.1016/j.crme.2011.11.009 [21] GEYER T F, KAMPS L, SARRADJ E, et al. Vortex shedding and modal behavior of a circular cylinder equipped with flexible flaps[J]. Acta Acustica united with Acustica, 2019, 105(1): 210–219. doi: 10.3813/AAA.919301 [22] KAMPS L, GEYER T F, SARRADJ E, et al. Vortex shedding noise of a cylinder with hairy flaps[J]. Journal of Sound and Vibration, 2017, 388: 69–84. doi: 10.1016/j.jsv.2016.10.039 [23] DENG Z, CHEN W L, YANG Z F. The control mechanism of the soft trailing fringe on the flow characteristics over an airfoil[J]. Physics of Fluids, 2022, 34(9): 095112. doi: 10.1063/5.0106936 [24] DENG J, MAO X R, XIE F F. Dynamics of two-dimensional flow around a circular cylinder with flexible filaments attached[J]. Physical Review E, 2019, 100(5): 053107. doi: 10.1103/physreve.100.053107 [25] DENG J, XU J J, YE Q Q. Experimental investigation of flow around a circular cylinder with attached membranes[J]. Journal of Fluids and Structures, 2022, 113: 103628. doi: 10.1016/j.jfluidstructs.2022.103628 [26] KOEHL M A R. How do benthic organisms withstand moving water?[J]. American Zoologist, 1984, 24(1): 57–70. doi: 10.1093/icb/24.1.57 [27] BECHERT D W, BRUSE M, HAGE W, et al. Fluid mechanics of biological surfaces and their technological application[J]. Naturwissenschaften, 2000, 87(4): 157–171. doi: 10.1007/s001140050696 [28] DE LANGRE E. Effects of wind on plants[J]. Annual Review of Fluid Mechanics, 2008, 40: 141–168. doi: 10.1146/annurev.fluid.40.111406.102135 [29] IRWIN H P A H, COOPER K R, GIRARD R. Correction of distortion effects caused by tubing systems in measurements of fluctuating pressures[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1979, 5(1-2): 93–107. doi: 10.1016/0167-6105(79)90026-6 [30] CHEN W L, LI H, HU H. An experimental study on a suction flow control method to reduce the unsteadiness of the wind loads acting on a circular cylinder[J]. Experiments in Fluids, 2014, 55(4): 1707. doi: 10.1007/s00348-014-1707-7 [31] PARK J, DERRANDJI-AOUAT A, WU B, et al. Uncertainty analysis: Particle imaging velocimetry[C]// ITTC Recommended Procedures and Guidelines, Interna-tional Towing Tank Conference. 2008. [32] SIROVICH L. Turbulence and the dynamics of coherent structures. I. Coherent structures[J]. Quarterly of Applied Mathematics, 1987, 45(3): 561–571. doi: 10.1090/qam/910462 [33] DERI E, BRAZA M, CID E, et al. Investigation of the three-dimensional turbulent near-wake structure past a flat plate by tomographic PIV at high Reynolds number[J]. Journal of Fluids and Structures, 2014, 47: 21–30. doi: 10.1016/j.jfluidstructs.2012.11.005 [34] PROTHIN S, DJERIDI H, BILLARD J Y. Coherent and turbulent process analysis of the effects of a longitudinal vortex on boundary layer detachment on a NACA0015 foil[J]. Journal of Fluids and Structures, 2014, 47: 2–20. doi: 10.1016/j.jfluidstructs.2013.08.014 -
下载:
点击查看大图
图(12)
计量
- 文章访问数: 219
- HTML全文浏览量: 55
- PDF下载量: 35
- 被引次数: 0
