Time Resolved PIV Investigation on the Skin Friction Reduction Mechanism of Outer-Layer Vertical Blades Array
The drag reducing efficiency of the outer-layer vertical blades, which were first devised by Hutchins (2003), have been demonstrated by the recent towing tank measurements. From the drag measurement of flat plate with various vertical blades arrays by Park et al. (2011), a maximum 9.6% of reduction...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2015-02-01
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| Series: | Advances in Mechanical Engineering |
| Online Access: | https://doi.org/10.1155/2014/901421 |
| _version_ | 1828415157436416000 |
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| author | Seong Hyeon Park Nam Hyun An Hyun Sik Yoon Hyun Park Ho Hwan Chun Inwon Lee |
| author_facet | Seong Hyeon Park Nam Hyun An Hyun Sik Yoon Hyun Park Ho Hwan Chun Inwon Lee |
| author_sort | Seong Hyeon Park |
| collection | DOAJ |
| description | The drag reducing efficiency of the outer-layer vertical blades, which were first devised by Hutchins (2003), have been demonstrated by the recent towing tank measurements. From the drag measurement of flat plate with various vertical blades arrays by Park et al. (2011), a maximum 9.6% of reduction of total drag was achieved. The scale of blade geometry is found to be weakly correlated with outer variable of boundary layer. The drag reduction of 2.8% has been also confirmed by the model ship test by An et al. (2014). With a view to enabling the identification of drag reduction mechanism of the outer-layer vertical blades, detailed flow field measurements have been performed using 2D time resolved PIV in this study. It is found that the skin friction reduction effect is varied according to the spanwise position, with 2.73% and 7.95% drag reduction in the blade plane and the blade-in-between plane, respectively. The influence of vertical blades array upon the characteristics of the turbulent coherent structures was analyzed by POD method. It is observed that the vortical structures are cut and deformed by blades array and the skin frictional reduction is closely associated with the subsequent evolution of turbulent structures. |
| first_indexed | 2024-12-10T13:39:50Z |
| format | Article |
| id | doaj.art-40abaf0bcfb74718b10f8b5b78cfd7cf |
| institution | Directory Open Access Journal |
| issn | 1687-8132 |
| language | English |
| last_indexed | 2024-12-10T13:39:50Z |
| publishDate | 2015-02-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Advances in Mechanical Engineering |
| spelling | doaj.art-40abaf0bcfb74718b10f8b5b78cfd7cf2022-12-22T01:46:42ZengSAGE PublishingAdvances in Mechanical Engineering1687-81322015-02-01710.1155/2014/90142110.1155_2014/901421Time Resolved PIV Investigation on the Skin Friction Reduction Mechanism of Outer-Layer Vertical Blades ArraySeong Hyeon Park0Nam Hyun An1Hyun Sik Yoon2Hyun Park3Ho Hwan Chun4Inwon Lee5 Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan 609-735, Republic of Korea Department of Shipbuilding and Marine Engineering, Koje College, Gyeongsangnam-do 656-701, Republic of Korea Global Core Research Center for Ships and Offshore Plants (GCRC-SOP), Pusan National University, Busan 609-735, Republic of Korea Global Core Research Center for Ships and Offshore Plants (GCRC-SOP), Pusan National University, Busan 609-735, Republic of Korea Global Core Research Center for Ships and Offshore Plants (GCRC-SOP), Pusan National University, Busan 609-735, Republic of Korea Global Core Research Center for Ships and Offshore Plants (GCRC-SOP), Pusan National University, Busan 609-735, Republic of KoreaThe drag reducing efficiency of the outer-layer vertical blades, which were first devised by Hutchins (2003), have been demonstrated by the recent towing tank measurements. From the drag measurement of flat plate with various vertical blades arrays by Park et al. (2011), a maximum 9.6% of reduction of total drag was achieved. The scale of blade geometry is found to be weakly correlated with outer variable of boundary layer. The drag reduction of 2.8% has been also confirmed by the model ship test by An et al. (2014). With a view to enabling the identification of drag reduction mechanism of the outer-layer vertical blades, detailed flow field measurements have been performed using 2D time resolved PIV in this study. It is found that the skin friction reduction effect is varied according to the spanwise position, with 2.73% and 7.95% drag reduction in the blade plane and the blade-in-between plane, respectively. The influence of vertical blades array upon the characteristics of the turbulent coherent structures was analyzed by POD method. It is observed that the vortical structures are cut and deformed by blades array and the skin frictional reduction is closely associated with the subsequent evolution of turbulent structures.https://doi.org/10.1155/2014/901421 |
| spellingShingle | Seong Hyeon Park Nam Hyun An Hyun Sik Yoon Hyun Park Ho Hwan Chun Inwon Lee Time Resolved PIV Investigation on the Skin Friction Reduction Mechanism of Outer-Layer Vertical Blades Array Advances in Mechanical Engineering |
| title | Time Resolved PIV Investigation on the Skin Friction Reduction Mechanism of Outer-Layer Vertical Blades Array |
| title_full | Time Resolved PIV Investigation on the Skin Friction Reduction Mechanism of Outer-Layer Vertical Blades Array |
| title_fullStr | Time Resolved PIV Investigation on the Skin Friction Reduction Mechanism of Outer-Layer Vertical Blades Array |
| title_full_unstemmed | Time Resolved PIV Investigation on the Skin Friction Reduction Mechanism of Outer-Layer Vertical Blades Array |
| title_short | Time Resolved PIV Investigation on the Skin Friction Reduction Mechanism of Outer-Layer Vertical Blades Array |
| title_sort | time resolved piv investigation on the skin friction reduction mechanism of outer layer vertical blades array |
| url | https://doi.org/10.1155/2014/901421 |
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