Fluid-Structural Coupling Analysis of Large Turbine under Extreme Climate Conditions

• Main Authors: Jia-Qi Guo, 郭家齊
• Other Authors: Gwo-Chung Tsai
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/63236764620323173624

碩士 === 國立宜蘭大學 === 機械與機電工程學系碩士班 === 104 === In the research, CAE software was used to evaluate the blade mechanical behavior of NREL 5MW offshore wind turbine under typhoon with the speed of 60 m/s at normal shutdown and abnormal shutdown. The computational fluid dynamic software (CFX) and ANSYS/Structure mechanics software were used to perform the fluid structure coupling analysis of offshore wind blade. In the fluid dynamic simulation analysis of the offshore wind blade, fluid dynamic characteristics, turbulence model, and the action of blade with the typhoon wind speed were considered. The pressure on the model calculated from the computational fluid dynamic was transfer to the solid model to perform the structural analysis to observe the stress distribution of the full model of the wind turbine. Offshore wind turbine under normal shutdown condition has the wind direction angle of 0 degrees and pitch angle of 0 degrees. Twelve blade models with different wind direction angles and pitch angles were investigated under abnormal shutdown condition. A single blade with 120-degree cylindrical sector fluid zone was created to perform the fluid structure coupling analysis for saving the computational time and obtaining the reliable results. The results showed that the most influenced region of the off-shore wind turbine is on the turbine blade under either normal or abnormal shutdown conditions. It was observed that the maximum stresses are at the root of the blade for different wind angles and pitch angles.