RTM Process Simulation And Mechanical Analysis Of Composite Wind Turbine Blades

Since the seriousness of global energy and environmental problems becomesmore and more salient during these years, human see an increasing need to newenergy. There is rapid expansion and growth on wind energy for it is renewable greenenergy resource which makes no environmental pollution. Nowadays, countries areactively exploiting and utilizing wind resources, and our country should beconsidered as one of them. The goal that wind energy can be transferred into electricenergy is achieved by nothing but wind turbine.As one key and foundational part of wind generator system, wind turbine bladebears the most complicated loads, and the normalization of design, rational of processand reliability of quality directly affects performance of wind turbine. This articletakes composite blades of a large horizontal axis wind turbine as the object study, andcarries out the research on blade design and modeling, simulation of resin transfermolding process, and mechanical analysis of wind turbine blade.Adoption of Wilson model and appropriate selection of characteristic parameterlike blade airfoil, tip-speed ratio are used during the blade design process. Chordlength and torsional angle of blade section at different radius are calculated. Anddimensional coordinates is obtained through coordinate transformation. The bladegeometric model is established by Pro/E, as well as the finite element model.The article simulates the resin transfer molding process of blade on the bases ofMoldflow software platform and gets filling time, volume shrinkage, warpage andresidual stress results. To reveal the influence melt temperature has on moldingproducts, comparison of simulations under various melt temperatures is conducted.The conclusions have directive significance to optimization of process andimprovement of blade quality.ANSYS is put to use to analyze the blade with mechanics based on finiteelement method. The inherent frequency and vibration are obtained which reveals thefrequency is close to its theoretical value. The article also discusses four main reasonsthat lead to blade vibration and method that prevent the wind turbine from resonance. The static analysis for blade operating at rating shows stress concentrating regionsand deformation of blade.Besides, to study the effects molding process has on performance of blade,simulation results which contain nodes, cell data, material properties and residualstress are imported into ANSYS for static analysis of blade, and comparison betweenthis and former results is conducted. Taking into consideration the influence processparameters have on blade properties, the article discusses static analysis results ofblade under different melt temperatures. And the conclusion about influence variousmelt temperatures have on blade properties is drew.