湖北丘陵山区不同气象条件对风机叶片覆冰特征影响的模拟分析OA

Based on icing observation records from the Jieshan Wind Farm in Hubei Province,this study first analyzes the correlation between blade icing occurrences and the 2-minute average wind speed.Subsequently,by integrating dynamic blade parameters with the blade element momentum theory,we employ an Eulerian approach coupled with Fluent software to simulate the air-water droplet two-phase flow.This methodology simplifies the computational process while effectively analyzing the impact of various meteorological conditions on the water droplet collision coefficient,ice thickness,and ice shape.The results indicate that:(1)Droplet impingement primarily occurs near the leading edge of the airfoil.Within an attack angle range of 5° to 25°,the impingement center shifts toward the lower edge as the attack angle increases,a trend consistently reflected in the calculated ice thickness.(2)For median volumetric droplet diameters ranging from 30 to 50 μm,the impingement center remains largely unchanged with increasing diameter,whereas both the peak collision coefficient and ice thickness increase.(3)The liquid water content in the air exhibits a minor influence on collision characteristics.(4)As wind speed increases,both the peak collision coefficient and the impingement range expand,leading to increased ice accretion on the blades.Analysis of field data from Jieshan Wind Farm and relevant literature further elucidates the reason for the decreased probability of blade icing when wind speed exceeds a certain threshold.(5)Within the temperature range of-5℃to-1℃,ice thickness increases as temperature decreases.The rate of ice accretion initially increases,then decreases,and eventually stabilizes.