This paper proposes a method of controlling the vortex-induced vibration (VIV) wind turbine towers by adding continuous trapezoidal straight spoiler plates (TS) onto their outer surface: fluid–solid coupling model was constructed to simulate processes Karman vortex generation and shedding on different surfaces an original tower (O–tower) with TS (TS–tower) assumed actual Re, while VIV frequenci...

This project takes XX unit as the analysis object to study first-order vibration wind speed of turbine under shutdown vibration. The vortex-induced response is calculated and displacement resonant by fluid-solid coupling method. above techniques methods are forward-looking advanced in characteristics domestic turbines. On basis fluid dynamics analysis, suppression measures studied emphatically....

We investigate the in-line and cross-flow vortex-induced vibrations of a long cylindrical tensioned beam, with length to diameter ratio L/D=200, placed within a linearly sheared oncoming flow, using three-dimensional direct numerical simulation. The study is conducted at three Reynolds numbers, from 110 to 1100 based on maximum velocity, so as to include the transition to turbulence in the wake...

In this paper, 3D flow past a long tapered tower is examined. A tapered tower is described by the taper ratio. Tapered cylinders are a good description of many structures, like wind turbine tower e.t.c. Similar to the flow around cylinders, the Reynolds number is the important flow parameter, and the Strouhal number represents the shedding frequency. These flow patterns are difficult to predict...

Lattice vibration modes are collective excitations in periodic arrays of atoms or molecules. These modes determine novel transport properties in solid crystals. Analogously, in periodical arrangements of magnetic vortex-state disks, collective vortex motions have been predicted. Here, we experimentally observe wave modes of collective vortex gyration in one-dimensional (1D) periodic arrays of m...

Monju is Japan's prototype fast breeder reactor :280 MWe (714MWt), fueled with mixed oxides of plutonium and uranium, cooled by liquid sodium. Construction was started in 1985 and initial criticality was attained in April 1994 On 8th December 1995, sodium leakage from a secondary circuit occurred in a piping room of the reactor auxiliary building. The secondary sodium leaked through a temperatu...