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Numerical simulations of a ship in cavitation flow before and after the installation of a stern flap were conducted for the DTMB5415 benchmark ship model, considering factors such as ship speed, propeller speed, and ship wake. The results show that owing to the dual effects of change of propeller inflow and decrease in propeller speed, the cavitation area and cavitation start-stop angle of the propeller increase after the installation of a stern flap. The blade frequency amplitude of the propeller excitation force/torque decreased by an average of 9% at Fr=0.28 with the stern flap installed. Owing to the negative impact of the propeller cavitation, the corresponding reduction was only 2.5% at Fr=0.413. The hull surface fluctuating pressure was mainly affected by a decrease in the propeller speed after the installation of a stern flap. The average reductions in the blade frequency amplitude at low and high speeds were 17% and 12%, respectively.
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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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