| The iced conductors generate self-excitation vibration in the wind. When the frequency of the vibration is close to the intrinsic frequency of conductors, it tends to generate galloping which is a kind of vibration with low frequency and high amplitude. In order to study galloping, lots of experiments have been done to get aerodynamic characteristics of iced conductors. Because the ice shape is various, such experiments cost too much to be practical. So the numerical simulation study becomes most helpful.In this thesis the flow around the iced conductors is numerically simulated. The numerical results are compared with the experiment's results to investigate the possibility of providing aerodynamic data of the iced conductors using numerical simulation instead of expensive tests.It can be seen from the study that a reasonable difference style is very important to an effective simulation. A uniform viscous and incompressible flow around three bundled iced power transmission lines was numerical simulated. The CFD technology is used to calculate aerodynamic characteristics of the flow and the finite volume method for incompressible Navier-Stokes equations is employed in the program. The Reynolds numbers of the simulation are 104 and 105 respectively. In order to overcome numerical in stability for the high Reynolds number flows, quadratic up wind scheme (QUICK) is incorporated for the Navier-Stokes equations, which is of third-order accuracy for the advection and remains only second-order for other terms such as diffusion.In the analysis of the feasibility on the basis of this paper were to review iced power transmission line, three bundled iced power transmission lines arranging in different ways, the facilities to restrict galloping and the dynamic aerodynamic characteristics of the line, and Explore some of these laws. |
