| Autor: |
Wang, Xiao Hang, Wong, Kok Hoe, Chong, Wen Tong, Ng, Jo Han, Qiu, Cheng Jun, Khor, Chong Shen |
| Předmět: |
|
| Zdroj: |
International Journal of Energy Research; Jan2022, Vol. 46 Issue 1, p351-369, 19p |
| Abstrakt: |
Summary: Research has proven that the performance of a horizontal axis wind turbine (HAWTs) can be increased significantly by the application of a diffuser. It serves as a power augmented feature to draw higher wind flow toward the HAWT. However, research on integrating a diffuser onto vertical axis wind turbines (VAWTs) is scant, where most of the available power augmentation devices used for VAWTs are the convergent duct, deflector plate, shroud, and guide vanes which are placed in a proper configuration at the upwind. In this paper, laboratory tests and computational simulations have been carried out to study the impacts of a downwind diffuser on the performance of a VAWT. The diffuser is designed with the absence of a concentrator or flange and is placed downwind of the VAWT. Parametric computational fluid dynamics (CFD) studies were carried out for the downwind diffuser length and semi‐opening angle. A five‐bladed H‐rotor was selected as the testing wind turbine, whereas the diffuser used was made up of flat plates. Both simulations and experiment results are consistent. From the experiments, it was found that a downwind diffuser increases the VAWT performance remarkably. The diffuser‐augmented VAWT produced an increment in the maximum coefficient of power of 31.42% at the TSR 0.65 to 0.75. Moreover, the diffuser induced a better self‐start ability on the VAWT. The simulation showed that the flow field at the diffuser promotes a flow expansion which created a lower‐pressure region at downstream that accelerates the wind toward the VAWT, hence increasing the turbine performance significantly. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
