TY  - EJOU
AU  - Liu, Yuantao 
AU  - Li, Yanzhe 
AU  - Zhao, Shanpeng 
AU  - Zhang, Youpeng 
AU  - Zhang, Taizhen 

TI  - Numerical Analysis of the Influence of Turbulence Intensity on Iced Conductors Gallop Phenomena
T2  - Fluid Dynamics \& Materials Processing

PY  - 2023
VL  - 19
IS  - 10
SN  - 1555-2578

AB  - Turbulence is expected to play a relevant role in the so-called conductor gallop phenomena, namely, the highamplitude, low-frequency oscillation of overhead power lines due to the formation of ice structures and the ensuing effect that wind can have on these. In this work, the galloping time history of a wire with distorted (fixed in
time) shape due to the formation of ice is analyzed numerically in the frame of a fluid-solid coupling method for
different wind speeds and levels of turbulence. The results show that the turbulence intensity has a moderate
effect on the increase of the conductor’s aerodynamic lift and drag coefficients due to ice accretion; nevertheless,
the corresponding changes in the torsion coefficient are very significant and complicated. A high turbulence
intensity can affect the torsion coefficient in a certain range of attack angles and increase the torsion angle of
the conductor. Through comparison of the galloping phenomena for different wind velocities, it is found that the
related amplitude grows significantly with an increase of the wind speed. For a relatively large wind speed, the
galloping amplitude is more sensitive to the turbulence intensity. Moreover, the larger the turbulence intensity,
the larger the conductor’s vertical and horizontal galloping amplitudes after icing. The torsion angle also increases
with an increase in the wind speed and turbulence intensity.
KW  - Turbulence intensity; iced conductor; galloping amplitude; fluid-solid coupling

DO  - 10.32604/fdmp.2023.027471