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Modeling and Simulation of the VARI Process for Wind Turbine Blades Process Design

Author: TangYangGe
Tutor: LiuJinRong
School: Inner Mongolia University of Technology
Course: Chemical Engineering and Technology
Keywords: VARI Fan blade Simulation Permeability Runner
CLC: TM315
Type: Master's thesis
Year: 2013
Downloads: 30
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Abstract


Vacuum assisted resin infusion process (VARI) is a new cost-effective and high-performance composites forming technology. Because of its advantages of cost-effective,good properties of products and environmental-friendly, VARI has been successfullyapplied to the manufacture field of wind turbine blade.1.5MW fan blades are made byVARI, and it is a common challenge for blade manufacturers caused by large blade size,complex craft, many influence factors and so on. Which reinforced material permeability isone of the main factors affecting mold filling simulation based on the optimization ofpermeability as the core, this paper mainly discusses the simulation on the filling flowprocess of a40.3meters fan blade, then adjust design proposal by using computer aidedmolding technology. Pick out the optimum design combining with actual situation andconduct the actual production process, It turned to be a good effect.The permeability of the unidirectional composite fabric, the biaxial fabric, the threeaxial fabric and the continuous fabric were measured by1D unsaturation flow method inthis article. Using the experimental measured permeability values in mold fillingsimulation, the simulation of flow in the process of forward and mold filling time and theexperiment process in the resin flows forward with the mold filling time relationship, therelative error between the three axial cloth and continuous had time error.Will be trial and error method is applied to the mold filling simulation, by adjustingthe permeability of glass fiber cloth, realize the mold filling simulation time time matchwith the experiment, achieved the mold filling simulation method to optimize thepermeability value of purpose.In the meanwhile, we optimized permeability values by mold filling simulationmethod, then the equivalent permeability of wind turbine blade root, main beam, sandwichstructure and flanks of fan blade were obtained. After simulation on whole models byequivalent permeability values, we found that optimized permeability values were morecloser to the actual situation, and the results provided a research direction for theestablishment of the permeability database.1.5MW fan blades volume auxiliary molding processes were analyzed by the finiteelement/control volume method. We confirmed the perferred plan of root craft, compared mold filling time for different space of injection runners, and gained forefront location andpressure distribution in diverse moments, then we got the design for root which wasdecorated two runners in the root and the space is487mm. According to the technologyparameter of large fan blade and the permeability of each parts of the wind turbine bladeobtained through experiments and optimization. The results of the simulation showed theoptimal injection position which was decorate two runners in the root and the space is487mm, and the rest parts of the blade layout3runners, and then the numbers about theinjection gate, vent gate were respectively19and14, furthermore venting runner wasdecorated in the edge of the fan blade.On the basis of the optimal process obtained by mold filling simulation,1.5MW fanblades were designed and produced. The practical filling time is3hours past38minutes,and the error is16minutes compared with simulated result. The whole fan blade had afavorable quality, and its mechanics performance reached the standard.

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,) > Wind turbines
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