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The air lubrication drag reduction is a flow control method for energy-saving and carbon reduction. Under the background of “carbon peaking, carbon neutrality” strategy in China, the air lubrication drag reduction is essential for the development of low-carbon and zero-carbon ships since it can effectively reduce the ship resistance. In this paper, the background of the air lubrication drag reduction technology both at home and abroad is introduced. The definition and classification of air lubrication drag reduction are clarified based on the air-water flow regime and drag reduction mechanisms, i.e. dispersed bubble drag reduction and continuous air layer drag reduction. The progress of dispersed bubble drag reduction and continuous air layer drag reduction in two-phase flow regimes, drag reduction characteristics and mechanisms are summarized respectively. Finally, the status of air lubrication drag reduction is summarized and the future opportunities in this field are discussed.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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