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 vectors of the inner flow field of the diffuser for turbine blades rotating and no blades rotating are presented at Reynolds number, 0.9×105. 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 average 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.
| Original language | English |
|---|---|
| Pages (from-to) | 375-380 |
| Number of pages | 6 |
| Journal | Journal of Thermal Science |
| Volume | 17 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Dec 1 2008 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
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PIV measurements of flows around the wind turbines with a flanged-diffuser shroud. / Toshimitsu, Kazuhiko; Nishikawa, Koutarou; Haruki, Wataru; Oono, Shinichi; Takao, Manabu; Ohya, Yuji.
In: Journal of Thermal Science, Vol. 17, No. 4, 01.12.2008, p. 375-380.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - PIV measurements of flows around the wind turbines with a flanged-diffuser shroud
AU - Toshimitsu, Kazuhiko
AU - Nishikawa, Koutarou
AU - Haruki, Wataru
AU - Oono, Shinichi
AU - Takao, Manabu
AU - Ohya, Yuji
PY - 2008/12/1
Y1 - 2008/12/1
N2 - 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 vectors of the inner flow field of the diffuser for turbine blades rotating and no blades rotating are presented at Reynolds number, 0.9×105. 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 average 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.
AB - 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 vectors of the inner flow field of the diffuser for turbine blades rotating and no blades rotating are presented at Reynolds number, 0.9×105. 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 average 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.
UR - http://www.scopus.com/inward/record.url?scp=57349148356&partnerID=8YFLogxK
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U2 - 10.1007/s11630-008-0375-4
DO - 10.1007/s11630-008-0375-4
M3 - Article
AN - SCOPUS:57349148356
VL - 17
SP - 375
EP - 380
JO - Journal of Thermal Science
JF - Journal of Thermal Science
SN - 1003-2169
IS - 4
ER -