Simulation Study On Vacuum Infusion Composite Wind Turbine Blade Technology

Vacuum Assisted Resin Transfer Molding(VARTM)is an advanced composite material forming process which is low-cost and high performance.The products with VARTM has the advantages of high fiber content,low porosity,low manufacturing cost and low environmental impact.It’s suitable for the preparation of large-size wind turbine blades.In this paper,we test the permeability in X,Y and Z directions and the porosity of the fabric.We use the computer to simulate the filling process of VARTM and study the impact on the filling process with the design of lamination,runner,sandwich structure,ply drop structure.We design the actual production process of composite materials wind power and also make the product.Although the permeability of fiberglass unidirectional fabric varies greatly in the X and Y axis directions,due to the effect of the guide mesh,the penetration speed of the resin in the plane is mainly affected by the permeability in the thickness direction.Therefore,the changes of the ply angle make little effect on the filling process.Several ways of glass fiber/carbon fiber mixing layer are designed and simulated.After the glass fiber unidirectional fabric is converted into carbon fiber unidirectional fabric,the permeability in the thickness direction is higher than that of glass fiber unidirectional fabric and the filling time is reduced.We design five kinds of basic flow path,and discover that multiple injection pipelines on the middle of the surface instead of the edge can improve the filling efficiency.In this paper,Balsa wood and PVC foam sandwich materials for structural design are optimized.We cut balsa wood with small hole and equivalent it to 2mm wide grooves,and design 2mm wide grooves for resin flowing on PVC foam surface,then the simulation results show that the resin use the shorter time infiltrating from the surface down to the fiber panel below.When use the way of the layering layer,the design of a number of parallel pipelines set on the guide mesh surface can effectively improve the resin filling rate.We inject resin through time sharing to allow preferential infiltrating the thickest part,thereby reducing the difference in the thickness direction of the resin flow forward,and reducing the generation of defects.Through analyzing the force in different areas and different directions of the girder and the shell of the wind turbine blades,and the conclusion of the influence of the ply mode,the design of flow channel and the design of sandwich structure on the filling process in chapter 3,we design the process of producing the girder and the shell of the wind turbine blades,including the choice of the sandwich material,the way of laying and the design of the flow path.The girder and the shell ply are designed to use the layering layer.The flow path of the girder is designed to inject by one side,and exhaust by the other side.The flow path of the shell is designed to use fishbone-shaped channel on the blade root,and multiple parallel channels on other parts with injecting the resin at different times.We simulate the resin filling process of the girder and verify by experiments,which proves the feasibility of the computer simulation of VARTM forming process.Then we apply the process design to the actual production,and find the quality and the performance of the product is good.