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QBlade: OpenSource Horizontal and Vertical Axis Turbine 2030 Design and Simulation - Experts’ Visions - D. Marten J. Wendler G.Pechlivanoglou C.N. Nayeri C.O. Paschereit

H.F.I / ISTA TU Berlin - Chair of Fluid Dynamics - Mueller Breslau str. 8, D-10623, Berlin

QBlade Design - Design of custom using splines or airfoil mixing - Open source calculation , . - Airfoil import, NACA 4- and 5-digit airfoil generator distributed under the GPL. The software is seamlessly . - Inverse design from a specified velocity distributions integrated with the XFOIL airfoil design and analysis . - The integration of a sophisticated user interface makes Airfoil Analysis this software accessible to many more interested - Computation of airfoil coefficients employing the people than the usual command line interface software viscous-inviscid XFOIL panel method for angles of attack up to (or slightly beyond) tools. . - Visualization of pressure distribution and boundary - The software is especially adequate for teaching HAWT layer and VAWT design and . . Polar Extrapolation - QBlade includes user friendly post processing - Extrapolation of XFOIL generated or imported polars capabilities as well as advanced import & export over a range of 360° angle of attack using functionality. Montgomerie or Viterna algorithms. - The resulting software is a very flexible and user- Blade Design friendly platform for wind turbine blade design. It also - Advanced design of vertical and horizontal axis wind acts as a modular system for future implementations turbine blades. that can exploit the possibilities that a combination - Blade geometry export functionality of manual and parametric airfoil design and analysis . coupled with a blade design and simulation tool offers. Wind Turbine Simulation

- Selection of turbine type, and control . - User defined correction-algorithms and simulation

parameters. - Detailed presentation of simulation results in more than 30 variables, computation of annual yield for various windspeed distributions - Export functionality of all simulation results

airfoil analysis 360° Polar extrapolation wind turbine blade and rotor design HAWT analysis - Theoretical background VAWT analysis - Theoretical background The HAWT analysis is based on The VAWT analysis is based on the standard Blade Element the double-multiple-streamtube Momentum Method (BEM) [1 ]. algorithm after Paraschivoiu The BEM equates blade forces (DMST) [2]. Because the airflow with thrust force obtained from passes the rotor two times per the momentum balance over an rotation, a VAWT can be idealized ideal rotor disc. The generated as two HAWT's in a row. The blade forces have set of equations can then be solved iteratively. to be equated with the thrust force from the Numerous empirical correction algorithms, that momentum balance over two ideal rotordiscs. account for losses, three dimensional and One balancing is performed for the upwind half Reynolds number effects can be applied to a and the other for the downwind half of one simulation by means of user-defined options. rotation of the blade. wind turbine definition and simulation

Distribution Validation Downloads QBlade is distributed freely under the GPL Being applied for wind turbine designs and simulations by Since the software distribution started in June and is compiled for Windows, universities and research institutes around the world 201 0, QBlade has been downloaded more than and MacOS. The software can either be QBlade has been validated against numerous commercial 20.000 times by researchers, students and obtained from .net/projects/qblade and established wind turbine simulation codes [3] [4] [5] [6] [7]. people interested in from all or .de.to over the world.

List of contributors to the QBlade project: References: [1 ] HANSEN, M.O.L.: Aerodynamics of Wind Turbines, Earthscan, London, 2008 Juliane Wendler, TU Berlin [2] PARASCHIVOIU, I.: Wind Turbine Design – With Emphasis on Darrieus Concept, Presses Internationales Polytechnique, Canada, 2002 Guido Weinzierl, TEMBRA [3] SOLAND, T.: Investigation of Different Airfoils on Outer Sections of Large Rotor Blades, Bachelor sign Validation To [4] MARTEN, D.: Integration of a WT Blade Design Tool in XFOIL/XFLR5, Proceedings of the DEWEK 201 0, Bremen, Germany, 201 George Pechlivanoglou, TU Berlin / SMART BLADE [5] WIDJANARKO, S.: Steady Blade Element Momentum Code for Wind Turbine Design Validation Tool, Internship , 201 0 [6] MARTEN, D.: Extension of an Aerodynamic Simulator for Wind Turbine Blade Design and Performance Analysis, Diploma Thesis, TU Berlin, 201 0 David Marten, TU BERLIN [7] WENDLER, J.: Erweiterung einerSimulationssoftware um Module zuraerodynamischen Auslegung und Leistungsberechnung vertikalachsiger Windenergieanlagen, Bachelor Thesis, TU Berlin, 201 2