Numerical Investigation on the Effect of the Azimuthal Deviation on Performance of Equal Speed Co-Rotating Double Rotor Small-Scale Horizontal-Axis Wind Turbine
A double-rotor setup is a promising approach to increase wind turbine power extraction. One common double-rotor configuration is the co-rotating-equal-speed arrangement. The performance of this setup is affected by the azimuthal deviation between the two rotors, which remains constant during rotatio...
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| Format: | Article |
| Language: | Arabic |
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Assiut University, Faculty of Engineering
2024-01-01
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| Series: | JES: Journal of Engineering Sciences |
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| Online Access: | https://jesaun.journals.ekb.eg/article_326773_67ec6c7c6d6a7056dba2f53dc4e1332f.pdf |
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| author | Ahmed Morsi Mohamed El-Dosoky Othman Othman Mohamed Ahmed Ahmed Hamza Ali |
| author_facet | Ahmed Morsi Mohamed El-Dosoky Othman Othman Mohamed Ahmed Ahmed Hamza Ali |
| author_sort | Ahmed Morsi |
| collection | DOAJ |
| description | A double-rotor setup is a promising approach to increase wind turbine power extraction. One common double-rotor configuration is the co-rotating-equal-speed arrangement. The performance of this setup is affected by the azimuthal deviation between the two rotors, which remains constant during rotation. To identify the impact of azimuthal deviation, a numerical investigation was conducted using 10 m/s input wind speed and 0.9 m turbine diameter. The separation distance between the two rotors varied for two values of 0.14 and 0.25 rotor-diameter. The power coefficient of both rotors and the overall turbine were analyzed at different azimuthal deviations using Reynolds-averaged Navier–Stokes k-ω SST equations. The azimuthal deviation was positive when the front rotor preceded the rear and negative when the rear preceded the front. At 0.14 rotor-diameter separation, positive deviation increased the front rotor power coefficient but decreased the rear’s, while negative deviation had the opposite effect on both rotors. The maximum changes in the power coefficient of the front and rear rotors at tip speed ratio of 5 were ΔC_P=0.058 and ΔC_P=0.066, respectively. However, the net harvesting power by the double-rotor wind turbine exhibited slight marginal change of ΔC_P=0.008 at a tip speed ratio of 5. In contrast, at the greater separation, the power coefficients of both rotors and the overall turbine showed slight change with the variation of the azimuthal deviation with a marginal change of ΔC_P=0.012 at a tip speed ratio of 5. Moreover, the highest increase in the power coefficient was 15% compared to single rotor. |
| first_indexed | 2024-03-08T17:16:24Z |
| format | Article |
| id | doaj.art-fe80b4517e8b4105870069654360e092 |
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| issn | 1687-0530 2356-8550 |
| language | Arabic |
| last_indexed | 2024-03-08T17:16:24Z |
| publishDate | 2024-01-01 |
| publisher | Assiut University, Faculty of Engineering |
| record_format | Article |
| series | JES: Journal of Engineering Sciences |
| spelling | doaj.art-fe80b4517e8b4105870069654360e0922024-01-03T11:49:57ZaraAssiut University, Faculty of EngineeringJES: Journal of Engineering Sciences1687-05302356-85502024-01-01521163510.21608/jesaun.2023.239362.1267326773Numerical Investigation on the Effect of the Azimuthal Deviation on Performance of Equal Speed Co-Rotating Double Rotor Small-Scale Horizontal-Axis Wind TurbineAhmed Morsi0Mohamed El-Dosoky1Othman Othman2Mohamed Ahmed3Ahmed Hamza Ali4Mechanical Power Dept., Assiut Faculty of Engineering, Assiut Universitya. Department of Mechanical Engineering, Assiut University, 71516 Assiut, Egypt b. College of Engineering, Fahad Bin Sultan University, P.O.B.15700, Tabuk 71454 KSAMechanical Power Engineering Departmentt,Faculty of engineering,Assiut university.Assiut city,EgyptMechanical Power Engineering Department, Faculty of Engineering, Assiut University, Assiut city, EgyptMechanical Power Department, Faculty of Engineering, Assiut University, Assiut city, EgyptA double-rotor setup is a promising approach to increase wind turbine power extraction. One common double-rotor configuration is the co-rotating-equal-speed arrangement. The performance of this setup is affected by the azimuthal deviation between the two rotors, which remains constant during rotation. To identify the impact of azimuthal deviation, a numerical investigation was conducted using 10 m/s input wind speed and 0.9 m turbine diameter. The separation distance between the two rotors varied for two values of 0.14 and 0.25 rotor-diameter. The power coefficient of both rotors and the overall turbine were analyzed at different azimuthal deviations using Reynolds-averaged Navier–Stokes k-ω SST equations. The azimuthal deviation was positive when the front rotor preceded the rear and negative when the rear preceded the front. At 0.14 rotor-diameter separation, positive deviation increased the front rotor power coefficient but decreased the rear’s, while negative deviation had the opposite effect on both rotors. The maximum changes in the power coefficient of the front and rear rotors at tip speed ratio of 5 were ΔC_P=0.058 and ΔC_P=0.066, respectively. However, the net harvesting power by the double-rotor wind turbine exhibited slight marginal change of ΔC_P=0.008 at a tip speed ratio of 5. In contrast, at the greater separation, the power coefficients of both rotors and the overall turbine showed slight change with the variation of the azimuthal deviation with a marginal change of ΔC_P=0.012 at a tip speed ratio of 5. Moreover, the highest increase in the power coefficient was 15% compared to single rotor.https://jesaun.journals.ekb.eg/article_326773_67ec6c7c6d6a7056dba2f53dc4e1332f.pdfwind turbinesmall horizontal axis wind turbinedouble rotortip speed ratiopower coefficient |
| spellingShingle | Ahmed Morsi Mohamed El-Dosoky Othman Othman Mohamed Ahmed Ahmed Hamza Ali Numerical Investigation on the Effect of the Azimuthal Deviation on Performance of Equal Speed Co-Rotating Double Rotor Small-Scale Horizontal-Axis Wind Turbine JES: Journal of Engineering Sciences wind turbine small horizontal axis wind turbine double rotor tip speed ratio power coefficient |
| title | Numerical Investigation on the Effect of the Azimuthal Deviation on Performance of Equal Speed Co-Rotating Double Rotor Small-Scale Horizontal-Axis Wind Turbine |
| title_full | Numerical Investigation on the Effect of the Azimuthal Deviation on Performance of Equal Speed Co-Rotating Double Rotor Small-Scale Horizontal-Axis Wind Turbine |
| title_fullStr | Numerical Investigation on the Effect of the Azimuthal Deviation on Performance of Equal Speed Co-Rotating Double Rotor Small-Scale Horizontal-Axis Wind Turbine |
| title_full_unstemmed | Numerical Investigation on the Effect of the Azimuthal Deviation on Performance of Equal Speed Co-Rotating Double Rotor Small-Scale Horizontal-Axis Wind Turbine |
| title_short | Numerical Investigation on the Effect of the Azimuthal Deviation on Performance of Equal Speed Co-Rotating Double Rotor Small-Scale Horizontal-Axis Wind Turbine |
| title_sort | numerical investigation on the effect of the azimuthal deviation on performance of equal speed co rotating double rotor small scale horizontal axis wind turbine |
| topic | wind turbine small horizontal axis wind turbine double rotor tip speed ratio power coefficient |
| url | https://jesaun.journals.ekb.eg/article_326773_67ec6c7c6d6a7056dba2f53dc4e1332f.pdf |
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