integrated_design_of_turbine_rotors - Integrated design of...

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Integrated design of turbine rotors Lars Fuglsang Head of Blade Design, Research, LM GlasFber A/S Abstract. A novel approach in blade design is presented with proven potential for CoE reduction. RotorOpt, a dedicated design tool for integrated design and optimization of rotors has been developed to ensure a holistic design process. The design tool includes aerodynamic analysis, aeroelastic load calculation, tur- bine controller tuning and structural design, all set up in an integrated design environment with an optimizer on top. Special attention is put on the level of detail required in structural design to obtain meaningful results in optimization. Further, an important degree of freedom has been added de±ning the airfoils as design variables in the optimization. The design history of a rotor design using the RotorOpt design tool is presented and a substantial 3.5% increase in annual energy yield is found. PROBLEM DEFINITION Blade and turbine design is all about making the right compromises. The impact of the con- ceptual choices made in the initial design phase is massive and will a²ect CoE and thus competi- tiveness signi±cantly. The complexity in design is, however, signi±cant and the associated risk of bad choices favors incremental development of existing turbines in small steps. Most important in the de- sign process is integrated design of the turbine, the blades and the controller. The present paper ad- dresses the above problem outlining a structured approach in integrated design by which risk is mit- igated and CoE is reduced. In design of a turbine the number of parame- ters and choices to be made are numerous and it is simply not possible to de±ne all as free vari- ables in the design process. The common approach is to select some primary characteristics such as rated power, IEC class, rotor diameter, tip speed etc. These characteristics are commonly selected based on a market analysis, experience and design philosophy of the company. Based on these pri- mary variables, ±rst component designs are made and here from an iterative process begins. In the integrated design process less parameters are ±xed for the purpose of ±nding the best com- promise taking into account the couplings between components. Examples of such parameters are tip LM Glasfber A/S Rolles Møllevej 1, 6640 Lunderskov, Denmark e-mail: [email protected] phome: +45 7984 0000 url: speed, rotor diameter, rated power and their e²ect on blades, generator, bed frame etc. This adds, however, to the complexity of the design problem and it is argued that clari±cation of conceptual choices requires detailed load analysis and compo- nent design. To accommodate the added complex- ity in integrated design the design tool RotorOpt has been developed o²ering high level of detail and ³exibility.
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integrated_design_of_turbine_rotors - Integrated design of...

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