Tests for aerodynamic force interference effect of tandem cylinders

LIU Xiaobing1,2,3, WU Qianyun3, JIANG Huimin3, ZHAO Huitao3, YANG Qun1,2,3

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (7) : 37-44.

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PDF(3038 KB)
Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (7) : 37-44.

Tests for aerodynamic force interference effect of tandem cylinders

  • LIU Xiaobing1,2,3, WU Qianyun3, JIANG Huimin3, ZHAO Huitao3, YANG Qun1,2,3
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Abstract

Through wind tunnel tests of rigid model pressure measurement, aerodynamic force interference effects of tandem cylinders with different numbers and spacings in uniform flow field were studied. It was shown that the ratio  L/D of the center distance between adjacent cylinders L to cylinder diameter D changes from 1.2-12.0; the number of cylinders varies from 1-4; Reynolds number is 3.4 × 104. Test results showed that the critical spacing ratio (L/D)cr for flow state switching of tandem cylinders is 3.5-4; near the critical spacing, time average drag coefficient and fluctuating lift coefficient of the first two cylinders increase sharply, while the others drop sharply, and Strouhal number of each cylinder rises abruptly; the effect of aerodynamic force interference on time average drag coefficient and Strouhal number of tandem cylinders mainly reveals a reduction effect; effects of increase in the number of rear interference cylinders on the aerodynamic force of the first upstream cylinder can be ignored, while increase in the number of front interference cylinders has a significant impact on aerodynamic force of the last downstream cylinder.

Key words

tandem cylinders / aerodynamic force coefficient / Strouhal number / interference effect / wind tunnel test

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LIU Xiaobing1,2,3, WU Qianyun3, JIANG Huimin3, ZHAO Huitao3, YANG Qun1,2,3. Tests for aerodynamic force interference effect of tandem cylinders[J]. Journal of Vibration and Shock, 2021, 40(7): 37-44

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