scholarly journals An Integrated Method for Designing Airfoils Shapes

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Wang Xudong ◽  
Wang Licun ◽  
Xia Hongjun
Keyword(s):  
Wind Turbine ◽  
Design Method ◽  
Integrated Design ◽  
Direct Consequence ◽  
Airfoil Surface ◽  
Integrated Method ◽  
Analytical Functions ◽  
Drag And Lift ◽  
Main Component ◽  
Turbine Airfoils

A new method for designing wind turbine airfoils is presented in this paper. As a main component in the design method, airfoil profiles are expressed in a trigonometric series form using conformal transformations and series of polynomial equations. The characteristics of the coefficient parameters in the trigonometric expression for airfoils profiles are first studied. As a direct consequence, three generic airfoil profiles are obtained from the expression. To validate and show the generality of the trigonometric expression, the profiles of the NACA 64418 and S809 airfoils are expressed by the present expression. Using the trigonometric expression for airfoil profiles, a so-called integrated design method is developed for designing wind turbine airfoils. As airfoil shapes are expressed with analytical functions, the airfoil surface can be kept smooth in a high degree. In the optimization step, drag and lift force coefficients are calculated using the XFOIL code. Three new airfoils CQ-A15, CQ-A18, and CQ-A21 with a thickness of 15%, 18%, and 21%, respectively, are designed with the new integrated design method.

scholarly journals Integrated Design of Aerodynamic Performance and Structural Characteristics for Medium Thickness Wind Turbine Airfoil

2019 ◽  
Vol 9 (23) ◽  
pp. 5243
Author(s):  
Quan Wang ◽  
Pan Huang ◽  
Di Gan ◽  
Jun Wang
Keyword(s):  
Wind Turbine ◽  
Design Method ◽  
Structural Characteristics ◽  
Functional Integration ◽  
Integrated Design ◽  
Aerodynamic Performance ◽  
Integration Theory ◽  
Medium Thickness ◽  
Cross Sectional ◽  
Turbine Airfoils

The currently geometric and aerodynamic characteristics for wind turbine airfoils with the medium thickness are studied to pursue maximum aerodynamic performance, while the interaction between blade stiffness and aerodynamic performance is neglected. Combining the airfoil functional integration theory and the mathematical model of the blade cross-section stiffness matrix, an integrated design method of aerodynamic performance and structural stiffness characteristics for the medium thickness airfoils is presented. The aerodynamic and structural comparison of the optimized WQ-A300 airfoil, WQ-B300 airfoil, and the classic DU97-W-300 airfoil were analyzed. The results show that the aerodynamic performance of the WQ-A300 and WQ-B300 airfoils are better than that of the DU97-W-300 airfoil. Though the aerodynamic performance of the WQ-B300 airfoil is slightly reduced compared to the WQ-A300 airfoil, its blade cross-sectional stiffness properties are improved as the flapwise and edgewise stiffness are increased by 6.2% and 8.4%, respectively. This study verifies the feasibility for the novel design method. Moreover, it also provides a good design idea for the wind turbine airfoils and blade structural properties with medium or large thickness.

scholarly journals A new direct design method of wind turbine airfoils and wind tunnel experiment

2016 ◽  
Vol 40 (3) ◽  
pp. 2002-2014 ◽  
Author(s):  
Jin Chen ◽  
Quan Wang ◽  
Shiqiang Zhang ◽  
Peter Eecen ◽  
Francesco Grasso
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Design Method ◽  
Wind Tunnel Experiment ◽  
Direct Design ◽  
Turbine Airfoils

Aerodynamic Performance of Wind Turbine Blades in Dusty Environments

2007 ◽  
Author(s):  
Yasmin Khakpour ◽  
Suheila Bardakji ◽  
Sudhakar Nair
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Flow Rate Ratio ◽  
Surface Drag ◽  
Wind Turbine Blades ◽  
Dimensionless Numbers ◽  
Airfoil Surface ◽  
Discrete Phase ◽  
Sand Particles ◽  
Drag And Lift

The performance of wind turbine blades can be affected by conditions such as sand concentration in dry dusty environments. The mathematical formulations for continuum phase (air) and discrete phase (sand particles) along with the imposed assumptions and applied boundary conditions are presented in this paper. The numerical simulation conducted in this paper studied the effect of sand particles on flow structure and essential dimensionless numbers for flow over the primary airfoil of the wind turbine. The effects of controlling parameters such as sand dimensions, sand/air drift velocity and sand/air mass flow rate ratio are studied and the results are compared against the conditions of uniform, far-field air flow. The results are presented in terms of pressure distribution over the airfoil surface, drag and lift coefficients along with variation of erosion and accretion due to the collision of sand particles over the airfoil surface for various attack angles.

A Systematic Design Selection Methodology for System-Optimal Compliant Actuation

Robotica ◽  
2018 ◽  
Vol 37 (4) ◽  
pp. 656-674 ◽  
Author(s):  
Abdullah Kamadan ◽  
Gullu Kiziltas ◽  
Volkan Patoglu
Keyword(s):  
Knee Prosthesis ◽  
Design Method ◽  
Real Life ◽  
Direct Consequence ◽  
System Level ◽  
Full Potential ◽  
System Optimal ◽  
Compliant Actuation ◽  
Design Selection ◽  
Selection Methodology

SummaryThis work presents a systematic design selection methodology that utilizes a co-design strategy for system-level optimization of compliantly actuated robots that are known for their advantages over robotic systems driven by rigid actuators. The introduced methodology facilitates a decision-making strategy that is instrumental in making selections among system-optimal robot designs actuated by various degrees of variable or fixed compliance. While the simultaneous co-design method that is utilized throughout guarantees systems performing at their full potential, a homotopy technique is used to maintain integrity via generation of a continuum of robot designs actuated with varying degrees of variable and fixed compliance. Fairness of the selection methodology is ensured via utilization of common underlying (variable) compliant actuation principle and dynamical task requirements throughout the generated system designs. The direct consequence of the developed methodology is that it allows robot designers make informed selections among a variety of systems which are guaranteed to perform at their best. Applicability of the introduced methodology has been validated using a case study for system-optimal design of an active knee prosthesis that is driven by a mechanically adjustable compliance and controllable equilibrium position actuator (MACCEPA) under a periodic/real-life dynamical task.

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