Performance enhancement of Wells turbine: Combined radiused edge blade tip, static extended trailing edge, and variable thickness modifications
| Autor: | P. Madhan Kumar, Paresh Halder, Afzal Husain, Abdus Samad |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Pressure drop
Environmental Engineering Materials science Turbine blade 020209 energy Oscillating Water Column Ocean Engineering 02 engineering and technology Mechanics 01 natural sciences Turbine 010305 fluids & plasmas law.invention Physics::Fluid Dynamics Flow separation Axial compressor law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Trailing edge Wells turbine |
| Zdroj: | Ocean Engineering. 185:47-58 |
| ISSN: | 0029-8018 |
| DOI: | 10.1016/j.oceaneng.2019.05.041 |
| Popis: | The Wells turbine is used in conjunction with an oscillating water column to harvest wave energy. It is a self-rectifying axial flow reaction turbine which consists of symmetrical blades aligned normal to the incoming flow. A narrow operating range due to flow separation restricts the power extracting capability of the turbine at a higher flow rate. To improve its performance, a turbine blade with combined design modifications such as radiused edge blade (REB) tip, static extended trailing edge (SETE) and variable thickness blade (VTB) was investigated through CFD analysis. Three-dimensional time independent Reynolds-averaged Navier-Stokes equations were solved in a commercial solver to obtain the turbine performance, which was given by non-dimensional torque, pressure drop and efficiency. The combined REB tip, SETE and VTB modifications enhanced relative average turbine power output by 97% and the relative operating range by 22%. However, the average efficiency is decreased by 7.7%, because of the increased pressure drop. |
| Databáze: | OpenAIRE |
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