Development and performance testing of a small, multi-bladed wind turbine

Sant, Tonio; Farrugia, Robert N.; Muscat, Martin; Axisa, Redeemer; Borg, Albert; Cassar, Cecille M; Cassar, Josianne; Cordina, Christian; Schembri, Steven

doi:10.1177/0309524x19849845

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Equation (9) proposed by Lanzafame and Messina 32 was utilized for a#. Unlike the commonly used form in Manwell et al 18 which is a function of both F and u, equation ( 9) depends solely on a.…”

Section: Bem Methodsmentioning

confidence: 99%

“…In the experiments, optimum performance of a 0.5-m diameter turbine was achieved with a 3-blade, low design TSR rotor. Sant et al 9 reported on the design, installation, and power generation test results of a 9-blade turbine with a 3.4-m diameter to replace the American wind-driven water pump. The blades were shaped using the Eppler 197 airfoil profile.…”

Section: Introductionmentioning

confidence: 99%

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Increasing power coefficient of small wind turbine over a wide tip speed range by determining proper design tip speed ratio and number of blades

Yilmaz

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper proposes a design strategy based on an understanding of basic rotor aerodynamics principles to achieve aerodynamically efficient small wind turbine rotor by determining proper design tip speed ratio (TSR) and number of blades. In the design and performance analyses of rotors, the blade element momentum (BEM) method was employed in conjunction with the Viterna-Corrigan post-stall model and Buhl’s wake state model. BEM simulations use the Re number dependent airfoil aerodynamic coefficients derived through Xfoil panel code. Reduced design tip speed ratio increased rotor solidity and hence blade Reynolds number. The width of the optimum TSR range, on the other hand, was found to decrease when the design TSR was less than a certain threshold. At high tip speeds, rotors with optimum design TSR were able to maintain an almost constant and near-ideal axial induction factor, resulting widest optimum TSR range for high aerodynamic efficiency. Increasing number of blades ( B) increased CP,max, but further increase in B lowered rotor efficiency due to reduced blade Re number. Based on CFD results, 5-blade SD7032 rotor with a design TSR of 4 achieved 12.3% higher CP,max compared to 0.9 m diameter 3-blade experimental reference rotor. Maximum achievable power coefficient of infinitely many-bladed ideal rotor with design TSR of 4 is 0.559, while CP,max of 5-blade SD7032 rotor is 0.492.

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Section: Bem Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Increasing power coefficient of small wind turbine over a wide tip speed range by determining proper design tip speed ratio and number of blades

Yilmaz

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The windmill used here was developed by Singh 12 as a model of Wegereef's and a comparison of its thrust, power, and torque is given in John 13 . Other recent windmill studies include Sarkis and Pinilla 14 and Sant et al 15 who both considered non‐standard airfoil profiles for the blades.…”

Section: Introductionmentioning

confidence: 99%

Helical vortex theory and blade element analysis of multi‐bladed windmills

2022

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Multi-bladed windmills usually pump water for agriculture and domestic consumption, often in remote locations. Although they have been around for over 150 years, their aerodynamic performance is still poorly understood. This paper describes the use of helical vortex theory (HVT) and blade element momentum (BEM) analysis to predict windmill thrust, torque, and extracted power. We emphasize the unusual features of windmills: low Reynolds numbers and tip speed ratios and high solidity, all related to the generation of high torque at low wind speeds. Wind tunnel tests on a model rotor with 3, 6, 12, and 24 circular-arc, constant-chord blades determined the thrust, torque, and extracted power over a range of tip speed ratio that extended to runaway. For comparison, BEM was implemented with a correction for finite blade number derived from HVT, as well as the classical Prandtl tip loss factor. The HVT correction predicted the rotor power coefficient to within 3% of the test data on the average. At low tip speed ratios and smaller blade numbers, HVT was consistently more accurate than the Prandtl factor. At all blade numbers, the measured rotor torque exceeded the BEM predictions at the lowest tip speed ratios indicating stall delay which became more important (and more beneficial for windmill performance) as the blade number increased. The Prandtl formulation predicted the thrust to within a mean accuracy of 13% and was more accurate than the HVT method.

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Low-speed, low induction multi-blade rotor for energy efficient small wind turbines

Yilmaz

2023

Energy

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Development and performance testing of a small, multi-bladed wind turbine

Cited by 5 publications

References 17 publications

Increasing power coefficient of small wind turbine over a wide tip speed range by determining proper design tip speed ratio and number of blades

Increasing power coefficient of small wind turbine over a wide tip speed range by determining proper design tip speed ratio and number of blades

Helical vortex theory and blade element analysis of multi‐bladed windmills

Low-speed, low induction multi-blade rotor for energy efficient small wind turbines

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