Numerical investigation of dimple effects on darrieus vertical axis wind turbine
The Darrieus wind turbine is a type of vertical-axis wind turbines which, in spite of its simple structure, is very complex to analyze. In terms of aerodynamics, Darrieus VAWTs have properties which tend to make them distinctive of horizontal-axis wind turbines but generally are less effective. In t...
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| Veröffentlicht in: | Energy (Oxford) 2017-08, Vol.133, p.231-241 |
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| creator | Sobhani, Elyas Ghaffari, Mohammad Maghrebi, Mohammad Javad |
| description | The Darrieus wind turbine is a type of vertical-axis wind turbines which, in spite of its simple structure, is very complex to analyze. In terms of aerodynamics, Darrieus VAWTs have properties which tend to make them distinctive of horizontal-axis wind turbines but generally are less effective. In the present research, a cavity is created into blade's profile of a VAWT to enhance its performance. The computational fluid dynamics have been used to simulate the turbine in turbulent flow and finally calculate the forces affecting it. The shear stress transport (SST) k-w turbulence model has been used to complete the governing equations and the turbine has been modeled in two dimensions. In order to enhance efficiency and aerodynamic performance of the turbine, effects of different dimple parameters including diameter, profile and its location has been considered. The optimum airfoil state has been found with circular dimple with diameter equal to 8% of cord length located on pressure side of the airfoil and near the leading edge. Eventually, it was observed that the efficiency at optimal performance (λ = 2.6) and average efficiencies of the turbine were 18% and 25% improved when using the airfoil with a cavity, as compared to the reference airfoil.
•A detailed description of different stage of VAWTs aerodynamic analysis is proposed.•The effect of dimple to enhance efficiency of the VAWTs has been proven.•dimple parameters including diameter, profile and its location has been analyzed. |
| doi_str_mv | 10.1016/j.energy.2017.05.105 |
| format | Article |
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•A detailed description of different stage of VAWTs aerodynamic analysis is proposed.•The effect of dimple to enhance efficiency of the VAWTs has been proven.•dimple parameters including diameter, profile and its location has been analyzed.</description><subject>Aerodynamics</subject><subject>Computational fluid dynamics</subject><subject>Computer applications</subject><subject>Computer simulation</subject><subject>Darrieus</subject><subject>Dimple</subject><subject>Dimpling</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Horizontal Axis Wind Turbines</subject><subject>Hydrodynamics</subject><subject>Mathematical models</subject><subject>Mechanical stimuli</subject><subject>Optimization</subject><subject>Performance improvement</subject><subject>Shear stress</subject><subject>Turbines</subject><subject>Turbulence</subject><subject>Turbulent flow</subject><subject>Two dimensional models</subject><subject>Vertical axis wind turbines</subject><subject>Wind power</subject><subject>Wind turbine</subject><subject>Wind turbines</subject><issn>0360-5442</issn><issn>1873-6785</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp9kEtLxDAUhYMoOI7-AxcB161J8-xGkMEXiLrQdUib2yFlph2TdnT-val17erC4Z5z7_kQuqQkp4TK6zaHDsL6kBeEqpyIpIojtKBasUwqLY7RgjBJMsF5cYrOYmwJIUKX5QK9vYxbCL62G-y7PcTBr-3g-w73DXZ-u9sAhqaBeog4ic6G4GGMeA9h-DXZbx_xl-8cHsZQ-Q7O0UljNxEu_uYSfdzfva8es-fXh6fV7XNWM8aHjKqiKUphtQJX8poXulLWVVQWFSOgnGBWEspUpbWzEpidDE6XoDSBSgq2RFdz7i70n2N63LT9GLp00tAy9Sy05Dxt8XmrDn2MARqzC35rw8FQYiZ2pjUzOzOxM0QkdQq_mW2QGuw9BBNrD10NzofEwrje_x_wA9J1ekU</recordid><startdate>20170815</startdate><enddate>20170815</enddate><creator>Sobhani, Elyas</creator><creator>Ghaffari, Mohammad</creator><creator>Maghrebi, Mohammad Javad</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7ST</scope><scope>7TB</scope><scope>8FD</scope><scope>C1K</scope><scope>F28</scope><scope>FR3</scope><scope>KR7</scope><scope>L7M</scope><scope>SOI</scope></search><sort><creationdate>20170815</creationdate><title>Numerical investigation of dimple effects on darrieus vertical axis wind turbine</title><author>Sobhani, Elyas ; Ghaffari, Mohammad ; Maghrebi, Mohammad Javad</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c334t-172f295a87ed94c428b7adb162b30e7d53a60137b88da6e3a172fd89e780eb653</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Aerodynamics</topic><topic>Computational fluid dynamics</topic><topic>Computer applications</topic><topic>Computer simulation</topic><topic>Darrieus</topic><topic>Dimple</topic><topic>Dimpling</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Horizontal Axis Wind Turbines</topic><topic>Hydrodynamics</topic><topic>Mathematical models</topic><topic>Mechanical stimuli</topic><topic>Optimization</topic><topic>Performance improvement</topic><topic>Shear stress</topic><topic>Turbines</topic><topic>Turbulence</topic><topic>Turbulent flow</topic><topic>Two dimensional models</topic><topic>Vertical axis wind turbines</topic><topic>Wind power</topic><topic>Wind turbine</topic><topic>Wind turbines</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sobhani, Elyas</creatorcontrib><creatorcontrib>Ghaffari, Mohammad</creatorcontrib><creatorcontrib>Maghrebi, Mohammad Javad</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Environment Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Energy (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sobhani, Elyas</au><au>Ghaffari, Mohammad</au><au>Maghrebi, Mohammad Javad</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Numerical investigation of dimple effects on darrieus vertical axis wind turbine</atitle><jtitle>Energy (Oxford)</jtitle><date>2017-08-15</date><risdate>2017</risdate><volume>133</volume><spage>231</spage><epage>241</epage><pages>231-241</pages><issn>0360-5442</issn><eissn>1873-6785</eissn><abstract>The Darrieus wind turbine is a type of vertical-axis wind turbines which, in spite of its simple structure, is very complex to analyze. In terms of aerodynamics, Darrieus VAWTs have properties which tend to make them distinctive of horizontal-axis wind turbines but generally are less effective. In the present research, a cavity is created into blade's profile of a VAWT to enhance its performance. The computational fluid dynamics have been used to simulate the turbine in turbulent flow and finally calculate the forces affecting it. The shear stress transport (SST) k-w turbulence model has been used to complete the governing equations and the turbine has been modeled in two dimensions. In order to enhance efficiency and aerodynamic performance of the turbine, effects of different dimple parameters including diameter, profile and its location has been considered. The optimum airfoil state has been found with circular dimple with diameter equal to 8% of cord length located on pressure side of the airfoil and near the leading edge. Eventually, it was observed that the efficiency at optimal performance (λ = 2.6) and average efficiencies of the turbine were 18% and 25% improved when using the airfoil with a cavity, as compared to the reference airfoil.
•A detailed description of different stage of VAWTs aerodynamic analysis is proposed.•The effect of dimple to enhance efficiency of the VAWTs has been proven.•dimple parameters including diameter, profile and its location has been analyzed.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.energy.2017.05.105</doi><tpages>11</tpages></addata></record> |
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| subjects | Aerodynamics Computational fluid dynamics Computer applications Computer simulation Darrieus Dimple Dimpling Fluid dynamics Fluid flow Horizontal Axis Wind Turbines Hydrodynamics Mathematical models Mechanical stimuli Optimization Performance improvement Shear stress Turbines Turbulence Turbulent flow Two dimensional models Vertical axis wind turbines Wind power Wind turbine Wind turbines |
| title | Numerical investigation of dimple effects on darrieus vertical axis wind turbine |
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