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In order to study the thrust deduction of waterjet propelled high-speed amphibious platform, the self-propulsion flow field of the platform was solved, based on RANS equations and VOF model. The trim and heave motion of the platform were calculated by adopting overlapping grid method, and the effect of waterjet pump was simplified using body force method to realize the numerical simulation of self-propulsion of waterjet propelled high-speed amphibious platform. The inlet surface of the propeller was obtained by streamline tracing method, and the total thrust of the propeller was calculated by momentum flux method. The results show that the thrust deduction fraction of amphibious platform exhibits different characteristics at different speeds. At low speed, the thrust deduction fraction is positive. Negative thrust deduction occurs at medium and high speeds. In the whole speed range, the resistance increment is always positive and the jet thrust deduction fraction is always negative. The reason for the negative thrust deduction at medium and high speeds is that the resistance increment decreases gradually with the increase of speed and approaches zero.
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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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