Drag Reduction Through Air-Trapping Discrete Grooves in Underwater Applications
Vehicles travelling underwater experience drag and the frictional drag costs 60% of the total energy consumption. Using trapped air serving as a lubricant is a promising way to reduce drag. The trapped air plays a significant role in drag reduction, and most failures in drag reduction are related to...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
|
| Series: | Journal of Marine Science and Engineering |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-1312/12/12/2224 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846104128124616704 |
|---|---|
| author | You Nie Ding Weng Jiadao Wang |
| author_facet | You Nie Ding Weng Jiadao Wang |
| author_sort | You Nie |
| collection | DOAJ |
| description | Vehicles travelling underwater experience drag and the frictional drag costs 60% of the total energy consumption. Using trapped air serving as a lubricant is a promising way to reduce drag. The trapped air plays a significant role in drag reduction, and most failures in drag reduction are related to instability, escape, and dissolution of the trapped air. In this work, discrete grooves are employed to trap air and reduce drag. Through the analysis of the trapped air stability, the groove length and width are believed to be the main factors that influence the air escape and instability, and thus they are limited in this work to avoid these problems. The air dissolution is inevitable. The effective way to mitigate the air dissolution is to deepen the groove depth. The groove depth in this work varies from 0.5 mm to 4 mm. The numerical simulation is employed to analyze the flow field, reveal the drag reduction mechanism, and optimize the groove length. The experimental measurements are conducted to verify our design. The result confirms our design that the discrete grooves successfully avoid air escape and instability, mitigate air dissolution, and reduce drag. This work is meaningful for underwater vehicles to travel with low energy consumption and high speed. |
| format | Article |
| id | doaj-art-2f89cccef5704415a97ce885e0bf04bd |
| institution | Kabale University |
| issn | 2077-1312 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-2f89cccef5704415a97ce885e0bf04bd2024-12-27T14:33:18ZengMDPI AGJournal of Marine Science and Engineering2077-13122024-12-011212222410.3390/jmse12122224Drag Reduction Through Air-Trapping Discrete Grooves in Underwater ApplicationsYou Nie0Ding Weng1Jiadao Wang2State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, ChinaVehicles travelling underwater experience drag and the frictional drag costs 60% of the total energy consumption. Using trapped air serving as a lubricant is a promising way to reduce drag. The trapped air plays a significant role in drag reduction, and most failures in drag reduction are related to instability, escape, and dissolution of the trapped air. In this work, discrete grooves are employed to trap air and reduce drag. Through the analysis of the trapped air stability, the groove length and width are believed to be the main factors that influence the air escape and instability, and thus they are limited in this work to avoid these problems. The air dissolution is inevitable. The effective way to mitigate the air dissolution is to deepen the groove depth. The groove depth in this work varies from 0.5 mm to 4 mm. The numerical simulation is employed to analyze the flow field, reveal the drag reduction mechanism, and optimize the groove length. The experimental measurements are conducted to verify our design. The result confirms our design that the discrete grooves successfully avoid air escape and instability, mitigate air dissolution, and reduce drag. This work is meaningful for underwater vehicles to travel with low energy consumption and high speed.https://www.mdpi.com/2077-1312/12/12/2224drag reductiongroovestrapped air |
| spellingShingle | You Nie Ding Weng Jiadao Wang Drag Reduction Through Air-Trapping Discrete Grooves in Underwater Applications Journal of Marine Science and Engineering drag reduction grooves trapped air |
| title | Drag Reduction Through Air-Trapping Discrete Grooves in Underwater Applications |
| title_full | Drag Reduction Through Air-Trapping Discrete Grooves in Underwater Applications |
| title_fullStr | Drag Reduction Through Air-Trapping Discrete Grooves in Underwater Applications |
| title_full_unstemmed | Drag Reduction Through Air-Trapping Discrete Grooves in Underwater Applications |
| title_short | Drag Reduction Through Air-Trapping Discrete Grooves in Underwater Applications |
| title_sort | drag reduction through air trapping discrete grooves in underwater applications |
| topic | drag reduction grooves trapped air |
| url | https://www.mdpi.com/2077-1312/12/12/2224 |
| work_keys_str_mv | AT younie dragreductionthroughairtrappingdiscretegroovesinunderwaterapplications AT dingweng dragreductionthroughairtrappingdiscretegroovesinunderwaterapplications AT jiadaowang dragreductionthroughairtrappingdiscretegroovesinunderwaterapplications |