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In order to improve the propulsion performance of contra-rotating propellers and reduce the cavitation effect, an end plate was applied to the contra-rotating propeller. The cavitation performance and propulsion performance of the end-plate contra-rotating propeller were analyzed. The RANS method with Schnerr-Sauer cavitation model was used for analyzing. Then the propulsion performance of contra-rotating propellers composed of conventional skewed propellers and end-plate propellers were checked for comparison. It is found that the addition of an end-plate makes the contra-rotating propeller possess better anti-cavitation performance. The sheet cavitation range is reduced by about 59% in the bollard state (J=0), and the cavitation is delayed when J=0.1. In addition, under the condition of low advance speed, the end-plate contra-rotating propeller shows a higher propulsion efficiency by 0.9%~3.1% than the conventional one. The open water performance of the end-plate contra-rotating propeller was tested at different rotation speeds, and the data were in good agreement with the simulation results considering the cavitation model. In this study, an end plate is innovatively applied to the contra-rotating propeller, which is suitable for the propulsion and operation requirements of low-speed submersibles.
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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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