Abstract

The aerodynamic characteristics of wind blowing over three parallel bundled iced transmission lines were simulated by computation fluid dynamics (CFD) technology. The finite volume method and the SIMPLEC algorithm were used to solve the Navier-Stokes equations for the uniform viscous and incompressible flow when Reynolds number was in sub-critical area. In order to overcome the numerical instability for high Reynolds number flows, quadratic up wind scheme (QUICK) was incorporated for the Navier-Stokes equations, which is of third-order accuracy for the advection and remains only second-order accuracy for other terms such as diffusion. The effect of the wake interaction on the aerodynamic characteristics was analyzed for crescent and fan-shaped iced three bundled transmission lines. The results show that the scope of negative Deng Hartog coefficient for the crescent iced transmission lines is wider than that for the fan-shaped iced transmission lines, but the fan-shaped iced transmission lines gallop more violent than the crescent iced transmission lines. The aerodynamic coefficient of the leeward line is smaller than that of the upward line, and this is more evident for fan-shaped iced lines than for crescent iced lines.

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