Experimental Study on a Model of a Commercial Windpumping Rotor

Sarkis, N.; Pinilla, Alvaro

doi:10.1260/030952406779994178

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…Despite attempting several values of relaxation factor, the algorithm diverged for a few TSR values. In the present study, equations ( 9), ( 12), ( 6), (11), and (10) were substituted one into another sequentially to eliminate one parameter each time. By this way, equation (10) was reduced to a single parameter equation (as a function of axial induction factor, a).…”

Section: Bem Methodsmentioning

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%

“…They emphasized that the balancing operation is essential for vibration mitigation. Sarkis and Pinilla 11 conducted experimental work on 1/8 scale model rotor of a commercial wind-driven water pump. The S835 airfoil profile was used to shape 10-blade rotor, which had constant pitch angle and chord length.…”

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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“…Hitz and Wood (2011) discuss the blade arrangement strategies for water-pumping wind mills to minimise eccentricity in the rotor mass and hence also reduce associated vibration. Sarkis and Pinilla (2006) tested two different 10-bladed SMT rotor designs, each having a rotor diameter of 300 mm. Substantial improvement in aerodynamic efficiency was achieved in the second rotor design which was based on rotor aerodynamic theory as compared with the first one, based on a design adapted from a traditional multi-bladed wind turbine used for water pumping applications.…”

Section: Literature Reviewmentioning

confidence: 99%

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

et al. 2019

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This article presents selected results from the development process of a small, prototype multi-bladed wind turbine designed to replace the American western-style, wind-driven water pumps still encountered in the Maltese rural landscape. The main focus of this article is on the rotor design, fabrication and system assembly, as well as on the results of the first open field tests. While the new design proves that the new machine is capable of aesthetically representing the windmills of old, preliminary findings indicate that it is also capable of meeting its predicted performance characteristics in a satisfactory manner, albeit subject to the installation site’s specific wind climatology.

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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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Experimental Study on a Model of a Commercial Windpumping Rotor

Cited by 7 publications

References 2 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

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

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

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