Experimental study of air layer drag reduction of self-propelled model
ObjectivesThis paper explores the effects of air flow rate and sailing angle on the air layer retention and energy efficiency of the bottom groove of a ship, focusing on a large scale model of a bulk carrier. MethodsAn air layer drag reduction self-propelled model system and hull cavity scheme are d...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Editorial Office of Chinese Journal of Ship Research
2024-10-01
|
| Series: | Zhongguo Jianchuan Yanjiu |
| Subjects: | |
| Online Access: | http://www.ship-research.com/en/article/doi/10.19693/j.issn.1673-3185.03360 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846173791700385792 |
|---|---|
| author | Hao WU Ziye YANG Jianxin CAO Yongpeng OU |
| author_facet | Hao WU Ziye YANG Jianxin CAO Yongpeng OU |
| author_sort | Hao WU |
| collection | DOAJ |
| description | ObjectivesThis paper explores the effects of air flow rate and sailing angle on the air layer retention and energy efficiency of the bottom groove of a ship, focusing on a large scale model of a bulk carrier. MethodsAn air layer drag reduction self-propelled model system and hull cavity scheme are designed, and drag reduction experiments are conducted under open water conditions. The jet drag reduction effect on the model in a positive floating attitude of ship is examined, as well as the impact of a certain trim angle on the speed and shaft power of the model. Results The results indicate that, when the main engine speed is constant, air injection can significantly improve the speed of model; after stopping the jet, the air layer within the air cavity of the bottom groove can be maintained for a long time, with better drag reduction efficiency when the ship is in an upright state and the trimming is within 0.25 degrees. When the trimming angle is too large, the gas will overflow from both sides of the model head and the air layer will not effectively cover the bottom of the ship, decreasing the efficiency of drag reduction. ConclusionsSeveral meaningful conclusions are obtained from the above experiments, providing useful references for the engineering application of air layer drag reduction technology on full-formed ships. |
| format | Article |
| id | doaj-art-07a521208cd4483aba302940c6cf8335 |
| institution | Kabale University |
| issn | 1673-3185 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Editorial Office of Chinese Journal of Ship Research |
| record_format | Article |
| series | Zhongguo Jianchuan Yanjiu |
| spelling | doaj-art-07a521208cd4483aba302940c6cf83352024-11-08T09:59:41ZengEditorial Office of Chinese Journal of Ship ResearchZhongguo Jianchuan Yanjiu1673-31852024-10-01195434810.19693/j.issn.1673-3185.03360ZG3360Experimental study of air layer drag reduction of self-propelled modelHao WU0Ziye YANG1Jianxin CAO2Yongpeng OU3Key Laboratory of High Performance Ship Technology, Ministry of Education, Wuhan University of Technology, Wuhan 430063, ChinaKey Laboratory of High Performance Ship Technology, Ministry of Education, Wuhan University of Technology, Wuhan 430063, ChinaKey Laboratory of High Performance Ship Technology, Ministry of Education, Wuhan University of Technology, Wuhan 430063, ChinaCollege of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan 430033, ChinaObjectivesThis paper explores the effects of air flow rate and sailing angle on the air layer retention and energy efficiency of the bottom groove of a ship, focusing on a large scale model of a bulk carrier. MethodsAn air layer drag reduction self-propelled model system and hull cavity scheme are designed, and drag reduction experiments are conducted under open water conditions. The jet drag reduction effect on the model in a positive floating attitude of ship is examined, as well as the impact of a certain trim angle on the speed and shaft power of the model. Results The results indicate that, when the main engine speed is constant, air injection can significantly improve the speed of model; after stopping the jet, the air layer within the air cavity of the bottom groove can be maintained for a long time, with better drag reduction efficiency when the ship is in an upright state and the trimming is within 0.25 degrees. When the trimming angle is too large, the gas will overflow from both sides of the model head and the air layer will not effectively cover the bottom of the ship, decreasing the efficiency of drag reduction. ConclusionsSeveral meaningful conclusions are obtained from the above experiments, providing useful references for the engineering application of air layer drag reduction technology on full-formed ships.http://www.ship-research.com/en/article/doi/10.19693/j.issn.1673-3185.03360self-propelled modelair injection deviceair layer maintenancedrag reductionenergy conservation |
| spellingShingle | Hao WU Ziye YANG Jianxin CAO Yongpeng OU Experimental study of air layer drag reduction of self-propelled model Zhongguo Jianchuan Yanjiu self-propelled model air injection device air layer maintenance drag reduction energy conservation |
| title | Experimental study of air layer drag reduction of self-propelled model |
| title_full | Experimental study of air layer drag reduction of self-propelled model |
| title_fullStr | Experimental study of air layer drag reduction of self-propelled model |
| title_full_unstemmed | Experimental study of air layer drag reduction of self-propelled model |
| title_short | Experimental study of air layer drag reduction of self-propelled model |
| title_sort | experimental study of air layer drag reduction of self propelled model |
| topic | self-propelled model air injection device air layer maintenance drag reduction energy conservation |
| url | http://www.ship-research.com/en/article/doi/10.19693/j.issn.1673-3185.03360 |
| work_keys_str_mv | AT haowu experimentalstudyofairlayerdragreductionofselfpropelledmodel AT ziyeyang experimentalstudyofairlayerdragreductionofselfpropelledmodel AT jianxincao experimentalstudyofairlayerdragreductionofselfpropelledmodel AT yongpengou experimentalstudyofairlayerdragreductionofselfpropelledmodel |