Wind and Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Aerodynamic force of four-bundled conductors with distorted modeling

  • Liu, Muguang (School of Civil Engineering & Transportation, State Key Laboratory of Subtropical Building Science, South China University of Technology) ;
  • Liu, Cheng (School of Civil Engineering & Transportation, State Key Laboratory of Subtropical Building Science, South China University of Technology) ;
  • Xie, Zhuangning (School of Civil Engineering & Transportation, State Key Laboratory of Subtropical Building Science, South China University of Technology)
  • Received : 2021.01.31
  • Accepted : 2021.08.16
  • Published : 2021.10.25
⟨ Previous Next ⟩

Abstract

The current study investigates the aerodynamic characteristics of four-bundled conductors designed by distorted approach with a series of wind tunnel tests. The distorted aeroelastic model is designed at a geometry scale of 1:25 with two different span correction coefficients of 0.8 and 0.5. Two sag ratios of 5% and 10% are considered in the test, and the sag ratio of 5% is the major focus. A continuous PVC hose is adopted to simulate the aerodynamic shape of the conductor. The aeroelastic tests are performed on three kinds of uniform turbulent flow and for four different wind directions. The test results show that the mean drag of the distorted model with four-bundled conductors is smaller than that of the normal model, although the consistency of the drag force for each conductor has been satisfied according to the distortion theory. The mean tension for the distorted models is also lower than that of the normal model. However, there is an increasing trend in the fluctuating component of drag force and tension for the distorted model, except for a decrease in the fluctuating tension when the span correction coefficient is 0.5. The increase of turbulence intensity can enlarge the mean and fluctuating values of the aerodynamic forces for the four-bundled conductors, but no significant effects are found in the relative error between the mean values of the distorted and normal models. A substantial imbalance in mean drag and tension on the upstream and downstream conductors is observed under oblique wind. And the differences between the distorted and normal model gradually decrease with the increase of wind yaw angles. The increase of sag ratio can further enhance the unbalanced effect in tension under oblique wind, and has obvious influence on the variance of the drag force and tension. For the four-bundled conductors using distorted modeling, a ratio of around 0.8 rather than a smaller ratio around 0.5 is recommended.

Keywords

Acknowledgement

The research described in this paper was financial supported by the National Science Foundation of China (51978285), and National Engineering Laboratory for High Speed Railway Construction (2017HSR06).

References

  1. Deng, H., Si, R., Hu, X. and Duan, C. (2013), "Wind tunnel study on wind-induced vibration responses of a UHV transmission tower-line system", Advan. Struct. Eng, 16(7), 1175-1186. https://doi.org/10.1260/1369-4332.16.7.1175
  2. Deng, H., Xu, H., Duan, C., Jin, X. and Wang, Z. (2016), "Experimental and numerical study on the responses of a transmission tower to skew incident winds", J. Wind Eng. Ind. Aerod., 157, 171-188. http://doi.org/10.1016/j.jweia.2016.05.010.
  3. Deng, H., Zhu, S., Chen, X. and Wang, Z. (2003), "Wind tunnel investigation on model of long span transmission line system", J. Tongji Univ.(Nat.Sci.), 31(2), 132-137. https://doi.org/10.3321/j.issn:0253-374X.2003.02.002
  4. Elawady, A., Aboshosha, H., El Damatty, A., Bitsuamlak, G., Hangan, H. and Elatar, A. (2017), "Aero-elastic testing of multi-spanned transmission line subjected to downbursts", J. Wind Eng. Ind. Aerod., 169, 194-216. http://doi.org/10.1016/j.jweia.2017.07.010.
  5. GB/T 1179-2008 (2009), Round Wire Concentric Lay Overhead Electrical Stranded Conductors, Standards Press of China, Beijing, China.
  6. Hamada, A., King, J.P.C., El Damatty, A., Bitsuamlak, G. and Hamada, M. (2017), "The response of a guyed transmission line system to boundary layer wind", Eng. Struct., 139, 135-152. http://doi.org/10.1016/j.engstruct.2017.01.047.
  7. Holmes, J.D. (2017), Wind Loading of Structures, CRC Press, London.
  8. Huang, M., Lou, W., Yang, L., Sun, B., Shen, G. and Tse, K. (2012), "Experimental and computational simulation for wind effects on the Zhoushan transmission towers", Struct. Infrastruct. Eng., 8(8), 781-799. http://doi.org/10.1080/15732479.2010.497540.
  9. Irvine, H.M. (1981), Cable Structures, The MIT. Press, London.
  10. Li, Z., Ren, K., Xiao, Z., Wang, Z.S. and Yu, K. (2011), "Aeroelastic model design and wind tunnel tests of UHV transmission line system", Acta Aerod. Sinica, 29(1), 102-106. https://doi.org/10.3969/j.issn.0258-1825.2011.01.017
  11. Li, Z., Xiao, Z. and Han, F. (2008), "Aeroelastic model design and wind tunnel tests of 1000kV Hanjiang long span transmission line system", Power Syst. Technol., 32(12), 1-5.
  12. Liang, S., Zou, L., Wang, D. and Cao, H. (2015), "Investigation on wind tunnel tests of a full aeroelastic model of electrical transmission tower-line system", Eng. Struct., 85, 63-72. http://doi.org/10.1016/j.engstruct.2014.11.042.
  13. Lin, W., Savory, E., McIntyre, R., Vandelaar, C.S. and King, J.P.C. (2012), "The response of an overhead electrical power transmission line to two types of wind forcing", J. Wind Eng. Ind. Aerod., 100, 58-69. http://doi.org/10.1016/j.jweia.2011.10.005.
  14. Loredo-Souza, A. and Davenport, A. (2001), "A novel approach for wind tunnel modelling of transmission lines", J. Wind Eng. Ind. Aerod., 89, 1017-1029. http://doi.org/10.1016/s0167-6105(01)00096-4.
  15. Momomura, Y., Marukawa, H., Okamura, T., Hongo, E. and Ohkuma, T. (1997), "Full-scale measurements of wind-induced vibration of a transmission line system in a mountainous area", J. Wind Eng. Ind. Aerod., 72, 241-252. http://doi.org/10.1016/S0167-6105(97)00240-7.
  16. Simiu, E. and Scanlan, R. (1996), Wind Effects on Structures: Fundamentals and Applications to Design, John Wiley & Sons, INC., New York.
  17. Wang, D., Chen, X. and Li, J. (2017), "Prediction of wind-induced buffeting response of overhead conductor: Comparison of linear and nonlinear analysis approaches", J. Wind Eng. Ind. Aerod., 167, 23-40. http://doi.org/10.1016/j.jweia.2017.04.008.
  18. Xie, Q., Cai, Y. and Xue, S. (2017), "Wind-induced vibration of UHV transmission tower line system: Wind tunnel test on aeroelastic model", J. Wind Eng. Ind. Aerod., 171, 219-229. http://doi.org/10.1016/j.jweia.2017.10.011.
  19. Xie, Q. and Yang, J. (2013), "Wind tunnel test and numerical simulation on transmission tower-line coupling system", Power Syst. Technol., 37(5), 1237-1243.
  20. Zhang, Z., Wang, D., Wang, T., Yu, Z., Huang, Z. and Zhang, D. (2021), "Aeroelastic wind tunnel testing on the wind-induced dynamic reaction response of transmission line", J. Aerosp. Eng., 34(1). http://doi.org/10.1061/(asce)as.1943-5525.0001223.
  21. Zhao, G., Xie, Q., Liang, S. and Li, J. (2009), "Wind tunnel test on wind resistant design of high-voltage transmission tower-line coupling system", High Volt. Eng., 35(5), 1206-1213.
  22. Zhao, S., Yan, Z., Li, Z., Dong, J. and Nie, X. (2019), "Design and analysis of an aeroelastic model for the 1000 kV Sutong long span transmission tower-line system", J. Vib. Shock, 38(12), 1-8.