Wind and Structures

  • 제37권5호
  • /
  • Pages.375-382
  • /
  • 2023
  • /
  • 1226-6116(pISSN)
  • /
  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Aerodynamic characteristics of wavy splitter plate on circular cylinder

  • Liang Gao (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • J. Jegadeeshwaran (Turbulence & Flow Control Lab, School of Mechanical Engineering, SASTRA Deemed University) ;
  • S. Ramaswami (Turbulence & Flow Control Lab, School of Mechanical Engineering, SASTRA Deemed University) ;
  • S. B. M. Priya (School of Electrical and Electronics Engineering, SASTRA Deemed University) ;
  • S. Nadaraja Pillai (Turbulence & Flow Control Lab, School of Mechanical Engineering, SASTRA Deemed University)
  • 투고 : 2023.02.23
  • 심사 : 2023.08.03
  • 발행 : 2023.11.25
⟨ 이전 논문 다음 논문 ⟩

초록

The aerodynamic characteristics of a circular cylinder with a wavy splitter plate were experimentally studied, specifically the potential reduction of drag and fluctuations in drag. To study the individual effects of amplitude and wavelength, the experiments were conducted by varying one parameter at a time while holding the other one constant. To study the effect of amplitude (A), the wavelength to diameter ratio (λ/D) was fixed at 0.115 and the amplitude to diameter ratio (A/D) was varied as 0.005, 0.010, 0.015 and 0.020. Similarly, to study the effect of wavelength, A/D was fixed as 0.020 and λ/D was varied as 0.46, 0.23, 0.15 and 0.12. Analysis of the data indicated that the wavy splitter plate caused a significant reduction in both the magnitude and the fluctuation of drag. The variation of aerodynamic forces and the fluctuations with them corresponding to different Reynolds numbers were computed and the spectral aspects of fluctuating forces due to vortex shedding is analysed and effective reduction in both shedding frequency and magnitude was observed.

키워드

과제정보

Authors are grateful for the project supported by Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2022JM-282 & 2018JQ5081) and Natural Science Foundation of Shaanxi Provincial Department of Education (17JK0567).

참고문헌

  1. Assi, G.R.S., Bearman, P.W. and Kitney, N. (2009), "Low drag solutions for suppressing vortex-induced vibration of circular cylinders", J. Fluids Struct., 25(4), 666-675. https://doi.org/10.1016/j.jfluidstructs.2008.11.002.
  2. Baek, H. and Karniadakis, G.E. (2009), "Suppressing vortex-induced vibrations via passive means", J. Fluids Struct., 25(5), 848-866. https://doi.org/10.1016/j.jfluidstructs.2009.02.006.
  3. Chen, W.-L., Chen, G.-B., Xu, F., Huang, Y.-, Gao, D.-L. and Li, H. (2020), "Suppression of vortex-induced vibration of a circular cylinder by a passive-jet flow control", J. Wind Eng. Ind. Aerod., 199, 104119. https://doi.org/10.1016/j.jweia.2020.104119.
  4. Chen, W.-L., Xin, D.-B., Xu, F., Li, H., Ou, J.-P. and Hu, H. (2013), "Suppression of vortex-induced vibration of a circular cylinder using suction-based flow control", J. Fluids Struct., 42, 25-39. https://doi.org/10.1016/j.jfluidstructs.2013.05.009.
  5. Fransson, J.H.M., Konieczny, P. and Alfredsson, P.H. (2004), "Flow around a porous cylinder subject to continuous suction or blowing", J. Fluids Struct., 19(8), 1031-1048. https://doi.org/10.1016/j.jfluidstructs.2004.06.005.
  6. Gao, D.-L., Chen, G.-B., Huang, Y.-W., Chen, W.-L. and Li, H. (2020), "Flow characteristics of a fixed circular cylinder with an upstream splitter plate: On the plate-length sensitivity.", Experim. Thermal Fluid Sci., 117, 110135. https://doi.org/10.1016/j.expthermflusci.2020.110135.
  7. Gao, Y., Fu, S., Ren, T., Xiong, Y. and Song, L. (2015), "VIV response of a long flexible riser fitted with strakes in uniform and linearly sheared currents", Appl. Ocean Res., 52, 102-114. https://doi.org/10.1016/j.apor.2015.05.006.
  8. Hsu, L.-C. and Chen, C.-L. (2020), "The drag and lift characteristics of flow around a circular cylinder with a slit", Europ. J. Mech. - B/Fluids, 82, 135-155. https://doi.org/10.1016/j.euromechflu.2020.02.009.
  9. Ishihara, T. and Li, T. (2020), "Numerical study on suppression of vortex-induced vibration of circular cylinder by helical wires", J. Wind Eng. Ind. Aerod., 197, 104081. https://doi.org/10.1016/j.jweia.2019.104081.
  10. Liang, S., Wang, J., Xu, B., Wu, W. and Lin, K. (2018), "Vortex-induced vibration and structure instability for a circular cylinder with flexible splitter plates", J. Wind Eng. Ind. Aerod., 174, 200-209. https://doi.org/10.1016/j.jweia.2017.12.030.
  11. Lin, J.C., Towfighi, J. and Rockwell, D. (1995), "Near-wake of a circular cylinder: Control, by steady and unsteady surface injection", J. Fluids Struct., 9(6), 659-669. https://doi.org/10.1006/jfls.1995.1036.
  12. Sui, J., Wang, J., Liang, S. and Tian, Q. (2016), "VIV suppression for a large mass-damping cylinder attached with helical strakes", J. Fluids Struct., 62, 125-146. https://doi.org/10.1016/j.jfluidstructs.2016.01.005.
  13. Wang, C., Tang, H., Duan, F. and Yu, S.C.M. (2016), "Control of wakes and vortex-induced vibrations of a single circular cylinder using synthetic jets", J. Fluids Struct., 60, 160-179. https://doi.org/10.1016/j.jfluidstructs.2015.11.003.
  14. Wang, R., Xin, D. and Ou, J. (2019), "Experimental investigation on suppressing circular cylinder VIV by a flow control method based on passive vortex generators", J. Wind Eng. Ind. Aerod., 187, 36-47. https://doi.org/10.1016/j.jweia.2019.01.017.
  15. Wu, J., Shu, C. and Zhao, N. (2014), "Investigation of flow characteristics around a stationary circular cylinder with an undulatory plate", Europ. J. Mech. - B/Fluids, 48, 27-39. https://doi.org/10.1016/j.euromechflu.2014.04.007.
  16. Zhou, B., Wang, X., Gho, W.M. and Tan, S.K. (2015), "Force and flow characteristics of a circular cylinder with uniform surface roughness at subcritical Reynolds numbers", Appl. Ocean Res., 49, 20-26. https://doi.org/10.1016/j.apor.2014.06.002.