首页|期刊导航|热科学学报（英文版）|PIV Measurements of Flows around the Wind Turbines with a Flanged-Diffuser Shroud
热科学学报（英文版）2008，Vol.17Issue(4)：375-380,6.
PIV Measurements of Flows around the Wind Turbines with a Flanged-Diffuser Shroud
PIV Measurements of Flows around the Wind Turbines with a Flanged-Diffuser Shroud
摘要
Abstract
The wind turbines with a flanged-diffuser shroud -so called "wind lens turbine"- are developed as one of high performance wind turbines by Ohya et al. In order to investigate the flow characteristics and flow acceleration, the paper presents the flow velocity measurements of a long-type and a compact-type wind turbines with a flanged-diffuser shroud by particle image velocimetry. In the case of the long type wind turbine, the velocity vec-tors of the inner flow field of the diffuser for turbine blades rotating and no blades rotating are presented at Rey-nolds number, 0.9x105. Furthermore the flow fields between with and without rotating are compared. Through the PIV measurement results, one can realize that the turbine blades rotating affects as suppress the disturbance and the flow separation near the inner wall of the diffuser. The time average velocity vectors are made on the av-erage of the instantaneous velocity data. There are two large vortices in downstream region of the diffuser. One vortex behind the flange acts as suck in wind to the diffuser and raise the inlet flow velocity. Another large vortex appears in downstream. It might be act as blockage vortex of main flow. The large blockage vortex is not clear in the instantaneous velocity vectors, however it exists clearly in the time average flow field. The flow field around the wind turbine with a compact-type flanged-diffuser shroud is also investigated. The flow pattern behind the flange of the compact-type turbine is the same as the long-type one. It means that the effect of flow acceleration is caused by the unsteady vortices behind the flange. The comparison with CFD and PIV results of meridional time-average streamlines after the compact-type diffuser is also presented.关键词
wind turbine/PIV/wind energy/flanged diffuser/flow visualizationKey words
wind turbine/PIV/wind energy/flanged diffuser/flow visualization分类
数理科学引用本文复制引用
Kazuhiko Toshimitsu,Koutarou Nishikawa,Wataru Haruki,Shinichi Oono,Manabu Takao,Yuji Ohya..PIV Measurements of Flows around the Wind Turbines with a Flanged-Diffuser Shroud[J].热科学学报（英文版）,2008,17(4):375-380,6.基金项目
The work was supported by the Grant-in-Aid for Sci-entific Research through grant number 19560791 from the Ministry of Education, Science, and Culture of Japan. （）
