A Study On The Erosion Wear And Corrosion Behavior Of Wind Turbine Tower And Numerical Simulation By Fluent

Wind power has been developing rapidly these years all over the world. Which reducing environmental pollution, easing energy crisis, adjusting the energy structure effectively and making a outstanding contributions to environmental sustainable development strategy positively at the same time. However, as the particular environment in Xinjiang, especially strong wind, sandstorm, saline soil and high salinity salt water damage. All that lead to wash out erosion and corrosion problems to land wind turbines. This paper targeted in the erosion and corrosion of the key structure of wind turbine—tower. The results of this paper listed as follows:(1) The conclusions of anticorrosion coating system were:There were three segments in anticorrosion painting system of tower analyzed by the method of thickness gauge magnetic resistance and scanning electron microscope. The average thickness of polyurethane top paint was 54.5μm, the high build epoxy intermediate paint was 145.5μm, the epoxy zinc rich primer was 68.2μm, and total 254.5μm measured from cross section morphology of paint. The test of pull off adhesion showed that the bonding strength among base paint and matrix as well as intermediate coat and finish coat were over 13 Mpa, and more than a half was cohesive failure within the paint, all showed the better adhesive strength.(2)The gas-solid wash out experiments showed that:a) The equivalent orthogonal erosion experiments were carried out in coating sample and Q345 E steel respectively. On the whole, the resistant coating was easier to be damaged. Under the combination of particle size among 0.15-0.22 mm, wind speed 17.4m/s, attack angle 60 degree, the maximum wear rate per unit time was 0.7256′10-3g/kg×s, 3.21 times of the steel plate. For two group tests, wind speed was the most important factor. While influence of particle size and attack angle was slight.b) The erosion areas of paint were similar ellipse, while in that of steel had no certain regulation and bigger than paint erosion area. The surface of erosion areas were out of flatness and local residual face paint. Obvious layer between intermediate paint can be picked out. Small circle zinc within base paint and no damage under washing out. The matrix was flat among scales ripple distribution. whether erosion time long or not, structure had no change.c) The defensive to salt of surface paint was stronger than intermediate paint evaluated from loss mass in Salt spray test. The sample of intermediate coat occurred rusty spot whose level between s2 and s3. The middle of rusty around scratches was serious than other areas. The spot presented small deep green morphology under sem. There were etching pit and irregulation substance in serious corrosion.d) Continue the gas-solid scouring abrasion on former salt samples to evaluate the coupling effect between corrosion. Under the same experiment conditions, the defensive of surface paint was stronger than intermediate paint, the erosion area was similar to ellipse, too. The weight loss of wash out after salt-fog was bigger than previous pure erosion samples, which presented about 1.25 times, and the erosion area was bigger, too. All these showed that erosion accelerated the proceed of wash out, altogether promoted the failure process of paint system(3)The conclusions of fluent simulation are as follows:a) The nephogram of speed and pressure were simulated under the parameters of fluid speed 17.4m/s, 60 degree attack angle and particle size within 0.15-0.22 mm.At the same time, the distribution of particle pathlines and traces were described. Finally, present the corrosion cloud picture of windward side in tower, and the numerical wear rate value of the average 0.4986e-08kg/m2 and maximum 1.09e-08kg/m2.b) The erosion rate of experiment value, three-dimension steel plate and three-dimension tower lower segment were obtained under the same conditions. The whole tendency of two simulation were nearly similar to each other, the tendency of part of experiment was likeness to simulation graph. The biggest wear in test was 5# 8.5794e-06kg/m2×s. The maximum wear rate among simulation of steel plate were 5#and 8#, respective 5.4714e-03kg/m2×s and 6.2291e-03kg/m2×s. While three dimension tower lower segment occurred in 5#and 7#, valued 2.4477 e-08kg/m2×s and 2.6129 e-08kg/m2×s. Under two different model simulation, the minimum value was 1#condition, namely wind speed 7.9m/s, attack angle 30 degree and particle sizeamong 0.15-0.22 mm.