scholarly journals WindPACT Turbine Rotor Design Study: June 2000--June 2002 (Revised)

2006 ◽  
Author(s):  
D J Malcolm ◽  
A C Hansen
Keyword(s):  
Turbine Rotor ◽  
Design Study ◽  
Rotor Design

scholarly journals Double-Stage H-Darrieus Wind Turbine - Rotor Aerodynamics

2016 ◽  
Vol 829 ◽  
pp. 21-26
Author(s):  
Mahdi Torabi Asr ◽  
Reza Osloob ◽  
Faizal Mustapha
Keyword(s):  
Turbine Rotor ◽  
Point Of View ◽  
Peak Performance ◽  
Average Wind Speed ◽  
Stage Design ◽  
Rotor Aerodynamics ◽  
Rotor Design ◽  
Average Wind ◽  
Start Up ◽  
Novel Design

H-Darrieus wind turbines, due to their simple design and relatively low manufacturing costs have recently received much attention particularly for standalone applications. However start-up issues associated with their operation restricted their operation in areas of low average wind speed and encourages engineers to develop novel design. Several design proposed in this way but in most cases design came up with complex sensing mechanisms and mechanical actuators or high cost manufacturing parts. A recent rotor design called double Darrieus rotor proposed as a German patent case bridged these complexities appropriately. The aim of present study is to investigate this innovative design from aerodynamic point of view by means of validated CFD techniques. A flow-driven simulation setup based on 6DOF calculations employed in order to study rotor operation from stand still until peak performance obtained. Results from these precise modeling reveal the superiority of the proposed double-stage design in compare with the original H-Darrieus rotors in terms of start-up behavior and optimum performance.

scholarly journals Tuning turbine rotor design for very large wind farms

2018 ◽  
Vol 474 (2220) ◽  
pp. 20180237 ◽  
Author(s):  
Takafumi Nishino ◽  
William Hunter
Keyword(s):  
Wind Farm ◽  
Wind Farms ◽  
Theoretical Method ◽  
Turbine Rotor ◽  
Aerodynamic Optimization ◽  
Rotor Design ◽  
Coupling Procedure ◽  
Future Extension ◽  
Large Wind ◽  
Bem Theory

A new theoretical method is presented for future multi-scale aerodynamic optimization of very large wind farms. The new method combines a recent two-scale coupled momentum analysis of ideal wind turbine arrays with the classical blade-element-momentum (BEM) theory for turbine rotor design, making it possible to explore some potentially important relationships between the design of rotors and their performance in a very large wind farm. The details of the original two-scale momentum model are described first, followed by the new coupling procedure with the classical BEM theory and some example solutions. The example solutions, obtained using a simplified but still realistic NREL S809 aerofoil performance curve, illustrate how the aerodynamically optimal rotor design may change depending on the farm density. It is also shown that the peak power of the rotors designed optimally for a given farm (i.e. ‘tuned' rotors) could be noticeably higher than that of the rotors designed for a different farm (i.e. ‘untuned' rotors) even if the blade pitch angle is allowed to be adjusted optimally during the operation. The results presented are for ideal very large wind farms and a possible future extension of the present work for real large wind farms is also discussed briefly.

Turbocharger Turbine Rotor Design for Low U/C Values

2019 ◽  
Author(s):  
Hua Chen ◽  
Yuchao Song ◽  
Aiguo Gu ◽  
Yangfang Zhang ◽  
Hongwei Li
Keyword(s):  
Internal Combustion Engines ◽  
Mechanical Design ◽  
Turbine Rotor ◽  
Expansion Ratio ◽  
Test Results ◽  
Rotor Design ◽  
A Value ◽  
Emission Regulations ◽  
Blade Tip ◽  
C Value

Abstract Emission regulations worldwide demand better low-end torque from internal combustion engines. This pushes the operating condition of turbocharger turbine to lower U/C values, where U is the blade tip speed and C is the turbine isentropic spouting velocity which increases with turbine expansion ratio. Traditional radial and some mixed flow turbines, dictated by their rotor design, have their efficiency peaks at U/C value around 0.70, a value considerably larger than desired. In this paper, we deliberate the measures to shift the peak efficiency of turbine rotor toward a lower U/C value than 0.7. The underlying physics of these measures are first explained, CFD and test results where available are then given. Implications to mechanical design, manufacturing and others are also discussed. Finally, an example of a turbine rotor design is given implementing these measures. Test results showed better efficiency was obtained from the design at lower U/C values than from the baseline.

scholarly journals A method for preliminary rotor design – Part 2: Wind turbine Optimization with Radial Independence

2021 ◽  
Vol 6 (3) ◽  
pp. 917-933 ◽  
Author(s):  
Kenneth Loenbaek ◽  
Christian Bak ◽  
Michael McWilliam
Keyword(s):  
Cost Function ◽  
Wind Turbine ◽  
Energy Production ◽  
Optimization Problems ◽  
Turbine Rotor ◽  
Global Optimum ◽  
Blade Root ◽  
Rotor Design ◽  
Global Power ◽  
Optimization Methodology

Abstract. A novel wind turbine rotor optimization methodology is presented. Using an assumption of radial independence it is possible to obtain an optimal relationship between the global power (CP) and load coefficient (CT, CFM) through the use of Karush–Kuhn–Tucker (KKT) multipliers, leaving an optimization problem that can be solved at each radial station independently. It allows solving load constraint power and annual energy production (AEP) optimization problems where the optimization variables are only the KKT multipliers (scalars), one for each of the constraints. For the paper, two constraints, namely the thrust and blade root flap moment, are used, leading to two optimization variables. Applying the optimization methodology to maximize power (P) or annual energy production (AEP) for a given thrust and blade root flap moment, but without a cost function, leads to the same overall result with the global optimum being unbounded in terms of rotor radius (R̃) with a global optimum being at R̃→∞. The increase in power and AEP is in this case ΔP=50 % and ΔAEP=70 %, with a baseline being the Betz optimum rotor. With a simple cost function and with the same setup of the problem, a power-per-cost (PpC) optimization resulted in a power-per-cost increase of ΔPpC=4.2 % with a radius increase of ΔR=7.9 % as well as a power increase of ΔP=9.1 %. This was obtained while keeping the same flap moment and reaching a lower thrust of ΔT=-3.8 %. The equivalent for AEP-per-cost (AEPpC) optimization leads to increased cost efficiency of ΔAEPpC=2.9 % with a radius increase of ΔR=17 % and an AEP increase of ΔAEP=13 %, again with the same, maximum flap moment, while the maximum thrust is −9.0 % lower than the baseline.

scholarly journals A method for preliminary rotor design – Part 1: Radially Independent Actuator Disc model

2021 ◽  
Vol 6 (3) ◽  
pp. 903-915 ◽  
Author(s):  
Kenneth Loenbaek ◽  
Christian Bak ◽  
Jens I. Madsen ◽  
Michael McWilliam
Keyword(s):  
Power Optimization ◽  
Turbine Rotor ◽  
Power Coefficient ◽  
Analytical Relationship ◽  
Local Power ◽  
Step Method ◽  
Thrust Coefficient ◽  
Rotor Design ◽  
Viscous Loss ◽  
Actuator Disc

Abstract. We present an analytical model for assessing the aerodynamic performance of a wind turbine rotor through a different parametrization of the classical blade element momentum (BEM) model. The model is named the Radially Independent Actuator Disc (RIAD) model, and it establishes an analytical relationship between the local thrust loading and the local power, known as the local-thrust coefficient and the local-power coefficient respectively. The model has a direct physical interpretation, showing the contribution for each of the three losses: wake rotation loss, tip loss and viscous loss. The gradient for RIAD is found through the use of the complex step method, and power optimization is used to show how easily the method can be used for rotor optimization. The main benefit of RIAD is the ease with which it can be applied for rotor optimization and especially load constraint power optimization as described in Loenbaek et al. (2021). The relationship between the RIAD input and the rotor chord and twist is established, and it is validated against a BEM solver.

Small Wind Turbine Rotor Design

2015 ◽  
Vol 806 ◽  
pp. 197-202
Author(s):  
Breda Kegl ◽  
Stanislav Pehan
Keyword(s):  
Wind Turbine ◽  
Design Procedure ◽  
Turbine Rotor ◽  
Direct Drive ◽  
Design Procedures ◽  
Rotor Design ◽  
Starting Conditions ◽  
Interesting Discussion ◽  
Turbine Design ◽  
Wind Turbine Rotor

The paper discusses the development procedure of a small direct drive wind turbine. Especially attention to the main rotor and to the wind blade design procedure is dedicated. Decisional technological steps are described, which makes the wind turbine design effective as environmental friendly product. All the design procedures are well documented by the clearly figures and by adequate descriptions as well. The starting conditions at different wind conditions are estimated and the interesting discussion about the necessity of the starting motor is given.

scholarly journals Wind turbine rotor design under wind farm control laws

2020 ◽  
Vol 1618 ◽  
pp. 042027
Author(s):  
L Sartori ◽  
P De Fidelibus ◽  
S Cacciola ◽  
A Croce
Keyword(s):  
Wind Turbine ◽  
Wind Farm ◽  
Turbine Rotor ◽  
Control Laws ◽  
Rotor Design ◽  
Wind Turbine Rotor
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