Numerical Simulation Of Transmission Line Vortex-Induced Vibration And Wake Effects

With the rapid development of China’s economy, the safe operation of EHV&UHV transmission lines is also get more and more attention. Wind-induced vibration as one of the main factors that endanger the safe operation of lines needed to be researched urgently.There are three main form of wind-induced vibration of transmission line, Aeolian vibration, Subspan Oscillation and Galloping. This paper focuses on the study of Aeolian vibration and Sub-span Oscillation. The Aeolian vibration of single conductor is mainly caused by Karman Vortex Street while the Aeolian vibration and Sub-span Oscillation of multi-split conductor involved Karman vortex street and wake effects.The simulation model of single conductor’s flow was set up firstly in this paper and comparison was taken between calculation results and classical results so as to validate the availability of CFD method. The Aeolian vibration model of single conductor was built to get the Vibration characteristic in vibrator simulation of different Reynolds. Forced vibration of single conductor was simulated employing ADINA to get lift and drag characteristics of conductor. Input power of single conductor was obtained via its Vibration displacement and lift schedule.Then twin conductor’s Aeolian vibration was studied. The Arrangement and CFD calculation model of twin conductors were raised up. The flow around characteristics of stable twin conductors was researched through the simulation under serial, parallel and staggered arrangement. The basic simulation analysis was finished toward the situation that the up-steam conductor fixed while down-steam conductor elastic supported.Finally, the Sub-span Oscillation of split conductors was analyzed. The simulation model of split conductors was established and calculated in ADINA. The course was taken in different Reynolds and arrangement. The average aerodynamic characteristics of down-steam conductor was determined in different position in the wake. All above provide a good basis for stability analysis of split conductors’ Sub-span Oscillation.