Experimental study on Reynolds number effect on aerodynamic pressure and forces of cylinder

Liu Qingkuan; Shao Qi; Zheng Yunfei; Li Conghui; Ma Wenyong; Liu Xiaobing

doi:10.11729/syltlx20150112

Volume 30 Issue 4

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Journal of Experiments in Fluid Mechanics > 2016 > 30(4): 7-13. > DOI: 10.11729/syltlx20150112

Liu Qingkuan, Shao Qi, Zheng Yunfei, Li Conghui, Ma Wenyong, Liu Xiaobing. Experimental study on Reynolds number effect on aerodynamic pressure and forces of cylinder[J]. Journal of Experiments in Fluid Mechanics, 2016, 30(4): 7-13. DOI: 10.11729/syltlx20150112

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Experimental study on Reynolds number effect on aerodynamic pressure and forces of cylinder

Liu Qingkuan^{1, 2, ,},
Shao Qi³,
Zheng Yunfei³,
Li Conghui³,
Ma Wenyong^{1, 2},
Liu Xiaobing^{1, 2}

1.
Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2.
Hebei Province Key Lab of Structural Health Monitoring and Control, Shijiazhuang 050043, China
3.
School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

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Received Date: August 27, 2015
Revised Date: April 27, 2016

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Abstract

Abstract

By wind tunnel tests, Reynolds number effect on drag force coefficient, lift force coefficient and wind pressure coefficient of cylinder were measured, the mechanism of the aerodynamic force variation from the point of view of the flow field distribution was analyzed, and the correlation of the flow field in the cylinder axis direction under the Reynolds number effect was studied. Results show that in the subcritical Reynolds number regime, the time averaged flow field around the cylinder model is symmetric, the Reynolds number has little influence on the averaged drag force coefficient and flow field, and the averaged lift force is around zero. In the critical Reynolds number regime, with the appearance of large amplitude negative pressure in certain areas, flow field becomes asymmetric, and the averaged lift force as well as fluctuation lift force appears. In the supercritical Reynolds number regime, with the appearance of large amplitude negative pressure on the two sides, flow field becomes to symmetric again, and the averaged lift force disappears. Reynolds number has obvious effect on the flow field correlation along the cylinder axis. In the subcritical Reynolds number regime, the scale of the Karman vortex in the cylinder axis direction is relatively large, while the scale becomes small with the increase of Reynolds number.
- cylinder,
- aerodynamic force,
- flow field distribution,
- Reynolds number,
- correlation in axis direction

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Experimental study on Reynolds number effect on aerodynamic pressure and forces of cylinder

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