Wind and Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Experimental study on passive flow control of circular cylinder via perforated splitter plate

  • Sahin, Serdar (Department of Mechanical Engineering, University of Cukurova) ;
  • Durhasan, Tahir (Department of Aerospace Engineering, University of Adana Alparslan Turkes Science and Technology) ;
  • Pinar, Engin (Department of Ceyhan Mechanical Engineering, University of Cukurova) ;
  • Akilli, Huseyin (Department of Mechanical Engineering, University of Cukurova)
  • Received : 2020.10.06
  • Accepted : 2021.05.28
  • Published : 2021.06.25
⟨ Previous Next ⟩

Abstract

Present experimental investigation aims to reduce the shedding of vortex in the near wake region of a circular cylinder using a perforated splitter plate. Perforated plates were placed in the wake region of the cylinder and aligned with the streamwise direction. The length of the plates was equal to the diameter of the cylinder. Different plate porosities and locations were examined and obtained results were compared to the baseline cylinder. Flow measurements downstream of the cylinder were performed in a water channel by employing a particle image velocimetry technique (PIV) at a Reynolds number of Re=5×103. It is observed that the effect of the porosity on the flow characteristics of the cylinder depends on the location of the plate. The strength of shear layers and flow fluctuations in the near wake region of the cylinder are considerably diminished by the perforated splitter plate. It is found that the porosity of ε=0.3 is the most effective control element for gap ratio of G/D=0.5. On the other hand, proper gap ratio is determined as G/D=2 for porosity of ε=0.7. It is concluded in the present study that the perforated splitter plate could be used as alternative passive flow control technique in order to reduce vortex shedding of the cylinder.

Keywords

References

  1. Akilli, H., Sahin, B. And Tumen, N.F. (2005), "Suppression of vortex shedding of circular cylinder in shallow water by a splitter plate", Flow Measure. Instrument., 16(4), 211-219. https://doi.org/10.1016/j.flowmeasinst.2005.04.004.
  2. Alam, M.M., Kim, S. and Maiti, D.K. (2016), "Flow interference between two tripped cylinders", Wind Struct., 23(2), 109-125. https://doi.org/10.12989/was.2016.23.2.109.
  3. Apelt, C.J., West, G.S. and Szewczyk, A.A. (1973), "The effects of wake splitter plates on the flow past a circular cylinder in the range 1044", J. Fluid Mech., 61(1), 187-198. https://doi.org/10.1017/S0022112073000649.
  4. Bao, Y. and Tao, J. (2013), "Active control of a cylinder wake flow by using a streamwise oscillating foil", Physics Fluids, 25(5), https://doi.org/10.1063/1.4802042.
  5. Cardell, G.S. (1993), "Flow past a Circular Cylinder with a Permeable Wake Splitter Plate", Ph.D. Dissertation, California Institute of Technology, Pasadena, California, USA.
  6. Chehreh, B.B. and Javadi, K. (2018), "Flow control around a circular cylinder with swinging thin plates", J. Fluids Struct., 81, 738-760. https://doi.org/10.1016/j.jfluidstructs.2018.06.010.
  7. Chen, W. L., Chen, G. B., Xu, F., Huang, Y. W., 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, https://doi.org/10.1016/j.jweia.2020.104119.
  8. Chen, W.L., Li, H. and Hu, H. (2014), "An experimental study on a suction flow control method to reduce the unsteadiness of the wind loads acting on a circular cylinder", Experim. Fluids, 55(4), https://doi.org/10.1007/s00348-014-1707-7.
  9. Cimbala, J.M. and Chen, K.T. (1994), "Supercritical Reynolds number experiments on a freely rotatable cylinder/splitter plate body", Phys. Fluids, 6(7), 2440-2445. https://doi.org/10.1063/1.868191.
  10. Dehkordi, B.G. and Jafari, H.H. (2010), "On the suppression of vortex shedding from circular cylinders using detached short splitter-plates", J. Fluids Eng. Transactions ASME, 132(4), 0445011-0445014. https://doi.org/10.1115/1.4001384.
  11. El-Khairy, H. (2003), "Drag reduction of a circular cylinder at subcritical flow regime using base shield plates", Wind Structures, 6(5), 347-356. https://doi.org/10.12989/was.2003.6.5.347.
  12. El-Khairy, H. (2008), "Evaluation of base shield plates effectiveness in reducing the drag of a rough circular cylinder in a cross flow", Wind Struct., 11(5), 377-389. https://doi.org/10.12989/was.2008.11.5.377.
  13. Firat, E., Ozkan, G.M. and Akilli, H. (2019), "Flow past a hollow cylinder with two spanwise rows of holes", Experim. Fluids, 60(11), https://doi.org/10.1007/s00348-019-2814-2.
  14. Gao, D., Chen, G., Chen, W., Huang, Y. and Li, H. (2019), "Effects of steady wake-jets on subcritical cylinder flow", Experiment. Thermal Fluid Sci., 102, 575-588. https://doi.org/10.1016/j.expthermflusci.2018.12.026.
  15. 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", Experiment. Thermal Fluid Sci., 117, https://doi.org/10.1016/j.expthermflusci.2020.110135.
  16. Gerrard, J.H. (1966), "The mechanics of the formation region of vortices behind bluff bodies", J. Fluid Mech., 25(2), 401-413. doi:10.1017/S0022112066001721.
  17. Gozmen, B. and Akilli, H. (2014), "Flow control downstream of a circular cylinder by a permeable cylinder in deep water", Wind Struct., 19(4), 389-404. https://doi.org/10.12989/was.2014.19.4.389.
  18. Gozmen, B., Akilli, H. and Sahin, B. (2013), "Passive control of circular cylinder wake in shallow flow", Measurement, 46(3), 1125-1136. https://doi.org//10.1016/j.measurement.2012.11.008.
  19. Gu, F., Wang, J.S., Qiao, X.Q. and Huang, Z. (2012), "Pressure distribution, fluctuating forces and vortex shedding behavior of circular cylinder with rotatable splitter plates", J. Fluids Struct., 28, 263-278. https://doi.org/10.1016/j.jfluidstructs.2011.11.005.
  20. Lin, S., Li, M. and Liao, H. (2017), "Aerodynamic coefficients of inclined and yawed circular cylinders with different surface configurations", Wind Struct., 25(5), 475-492. https://doi.org/10.12989/was.2017.25.5.475.
  21. Liu, K., Deng, J. and Mei, M. (2016), "Experimental study on the confined flow over a circular cylinder with a splitter plate", Flow Measure. Instrument., 51, 95-104. https://doi.org/10.1016/j.flowmeasinst.2016.09.002.
  22. Lu, L., Guo, X.L., Tang, G.Q., Liu, M.M., Chen, C.Q. and Xie, Z.H. (2016), "Numerical investigation of flow-induced rotary oscillation of circular cylinder with rigid splitter plate", Physics Fluids, 28(9), https://doi.org/10.1063/1.4962706.
  23. Ozkan, G.M., Firat, E. and Akilli, H. (2017a), "Passive flow control in the near wake of a circular cylinder using attached permeable and inclined short plates", Ocean Eng., 134, 35-49. https://doi.org/10.1016/j.oceaneng.2017.02.014.
  24. Ozkan, G.M., Firat, E. and Akilli, H. (2017b), "Control of vortex shedding using a screen attached on the separation point of a circular cylinder and its effect on drag", J. Fluids Eng. Transactions ASME, 139(7), https://doi.org/10.1115/1.4036186.
  25. Posdziech, O. and Grundmann, R. (2001), "Electromagnetic control of seawater flow around circular cylinders", Europ. J. Mech., B/Fluids, 20(2), 255-274. https://doi.org/10.1016/S0997-7546(00)01111-0.
  26. Roshko, A. (1955), "On the wake and drag of bluff bodies", J. Aeronaut. Sci., 22, 124-132. https://doi.org/10.2514/8.3286
  27. Schulmeister, J.C., Dahl, J.M., Weymouth, G.D. and Triantafyllou, M.S. (2017), "Flow control with rotating cylinders", J. Fluid Mech., 825, 743-763. https://doi.org/10.1017/jfm.2017.395.
  28. Shukla, S., Govardhan, R.N. and Arakeri, J.H. (2009), "Flow over a cylinder with a hinged-splitter plate", J. Fluids Struct., 25(4), 713-720. https://doi.org/10.1016/j.jfluidstructs.2008.11.004.
  29. Teksin, S. and Yayla, S. (2016), "Effects of flexible splitter plate in the wake of a cylindrical body", J. Appl. Fluid Mech., 9(6), 3053-3059. https://doi.org/10.29252/jafm.09.06.25564.
  30. Xu, J.C., Sen, M. and Gad-El-Hak, M. (1990), "Low-Reynolds number flow over a rotatable cylinder-splitter plate body", Physics Fluids A, 2(11), 1925-1928. https://doi.org/10.1063/1.857820.
  31. Yuan, W.B., Yu, N. T. and Wang, Z. (2018), "The effects of grooves on wind characteristics of tall cylinder buildings", Wind Struct., 26(2), 89-98. https://doi.org/10.12989/was.2018.26.2.089.
  32. Zhang, X., Choi, K.S., Huang, Y. and Li, H.X. (2019), "Flow control over a circular cylinder using virtual moving surface boundary layer control", Experiment. Fluids, 60(6), https://doi.org/10.1007/s00348-019-2745-y.
  33. Zhou, X., Wang, J.J. and Hu, Y. (2019), "Experimental investigation on the flow around a circular cylinder with upstream splitter plate", J. Visualization, 22(4), 683-695. doi:10.1007/s12650-019-00560-x.