Numerical Simulation And Experimental Investigation On Passive Jet Control For Vortex-induced Vibration Of Stay Cable

The cable-stayed bridge is often used for the long-span bridge because of its graceful shape and excellent mechanical properties. The vortex-induced vibration appears usually on the stay cable due to a small stiffness and damping, which will cause the fatigue of the stay cable and potential danger. So, it is important and meaningful to suppress the vortex-induced vibration.A passive jet control method is proposed to mitigate the vortex-induced vibration in the article. A hollow ring pipe is arranged on the circular cylinder. A set of holes are located on the outer surface of the hollow pipe. The oncoming flow enters into the hollow pipe through the holes on the windward side and blows out from the holes on the leeward side, which will suppress the alternating vortex shedding near the wake.A numerical simulation is carried out to study the aerodynamic force of the circular cylinder for different number of the holes on the outer surface of the hollow ring pipe and different thickness on radial direction of the hollow pipe. What’s more, it is also investigated at the different Reynolds number. Finally, a wind tunnel experiment is used to study the effect on the aerodynamic force by changing the spanwise spacing of the passive jet control pipe around the circular cylinder.It is revealed that the passive jet control method effectively suppresses the potential vortex-induced vibration at high Reynolds number(Re>1.0×104). The cross-flow lift fluctuation drop down more than 90%, and about 30% reduction for in-line drag force.