Open AccessAerodynamic performance and blockage investigation of a cambered multi-bladed windmill
Author(s) -
Itoje H. John,
Jerson Rogério Pinheiro Vaz,
David Murakami Wood
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1618/4/042003
Subject(s) - solidity , aerodynamics , airfoil , rotor (electric) , windmill , thrust , structural engineering , torque , wind tunnel , marine engineering , engineering , aerospace engineering , computer science , wind power , mechanical engineering , physics , electrical engineering , thermodynamics , programming language
Windmills for water pumping typically operate at low speed and high torque owing to their multi-bladed nature. This, however, complicates the rotor aerodynamic behavior due to the mutual interaction between adjacent blades and low Reynolds number, Re, operation. While studies on their aerodynamic performance indicate that increasing blade number, N, and airfoil type are critical analysis and design parameters, its low Re behavior with cambered airfoils appears complicated and is still poorly understood. Accordingly, the performance of a windmill model of diameter 0.68 m with 3 ≤ N ≤ 24 identical blades was investigated in two open jet wind tunnels, with different test section sizes: one with high blockage of 36.3 % and the other with a negligible blockage of 4.5 %, for comparison with Blade Element Theory (BET) predictions of thrust, torque, and power. It was found that BET is accurate except at low tip speed ratios, λ where it under-predicts the torque primarily because of the high solidity at high N. Furthermore, the study reveals that high blockage impacts significantly on rotor performance and is a function of N . Overall, the experiment gave a better performance, highlighting the importance of accounting for solidity in aerodynamic performance prediction.