微型风轮机叶片设计与制造.ppt

Design and Manufacturing of a Micro Wind Turbine Blade of Biocomposites.PurposesMicro wind turbine blade designManufacturing exploration Biomaterial Embedded casting .Outline Micro wind turbine blade design and prototype manufacturing Materials for small wind turbine bladeManufacturing of small wind turbine blades Conceptual design for small blade structure with biomaterial and manufacturingMicro blade mould design and manufacturingMicro blade manufacturing with casting mouldDiscussionsConclusions.Micro wind turbine blade design and prototype manufacturingBlade element momentum method(BEM)Profile for BEM(Burton,et al.,Wind Energy Handbook,2001).Micro wind turbine blade design and prototype manufacturingAirfoil geometry and aerodynamicsAirfoil analysis(Manwell et al.,Wind Energy Explained,2010).Micro wind turbine blade design and prototype manufacturingPromising airfoils Airfoils geometry and thickness.Micro wind turbine blade design and prototype manufacturingLift and drag coefficients Lift coefficient at Re=6104 Ratio of Cl/Cd at Re=6104.Micro wind turbine blade design and prototype manufacturingStructure and solid model3D-Blade profiles with SD 7037 Solid model of rotor assembly.Micro wind turbine blade design and prototype manufacturingRapid prototypeLeft:3-D model;Middle:rapid prototype;Right:rapid prototype after surface treatment.Materials for small wind turbine bladeMetal:Steel and aluminumGlass and carbon fibre composites Glass fibre:cheap and good properties Carbon fibre:Expensive and high properties Both petro-based and not environmental friendlyWood and bamboo Biocomposites Natural fibres enforcedv Flax,jute,hemp,sisal:Nottingham Innovative Manufacturing Research Centre(NIMRC)v Hemp:Ris national Laboratory,Denmark Bio-resinv Epoxidized soybean oil(ESO)resin and PLA resin:Denmarkv ESO and a natural resin from Venonia in Ethiopia (NIMRC).v ESO in our lab(Dr.Deka).Manufacturing of small wind turbine bladesMechanical fabricating:CNC for woodHand-lay-up:glass fibre,carbon fibre and wood epoxyFilament winding:petro-based fibrePultrusion of fiberglass:BergeyInjection:Southwest WindpowerResin Transfer Moulding(RTM):PopularResin infusion technology .Conceptual design for small blade structure with biomaterial and manufacturingProfile structure for small bladeBiocomposite design for small wind turbine blade.Conceptual design for small blade structure with biomaterial and manufacturingProfile for mircro wind turbine blade.Blade mould design and manufacturingThree part mouldTools and preparation.Blade mould design and manufacturingThree part mould Lower mould Three part mould after sealing.Blade mould design and manufacturingTwo part mould processing Preparation Lower mould Upper mould in processing.Blade mould design and manufacturingFinal two part mould.Blade manufacturingBlade in mould.Blade manufacturingBlade before deburring.Blade manufacturingMoulded blade(left)and the prototype blade used to produce the mould(right).DiscussionsPlaster for mouldBroken moulds.DiscussionsBio-resin is thinVacuum or pressure casting will work betterPlaster is not good enough for working more blades,but good for one blade with one mouldMore biocomposites need to be further studied.ConclusionsA micro wind turbine blade was designed A micro blade built in liquid casting mouldEmbedded casting works well with biomaterial insideCasting mould is good for complex geometry and thin airfoil.Questions?.