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For the influence of cavitation effect on the forward and reverse performance of two-way propellers, the ice-class propeller model test in a cavitation tunnel was adopted to discuss the hydrodynamic effects of the cavitation number and the advance coefficient on the propeller forward and reverse performance in the uniform flow environment, as well as the effects of the cavitation number, advance coefficient and ice-propeller spacing in ice blockage environment. The results show that in the uniform flow environment with constant flow speed and variable rotating speed, severe cavitation phenomenon reduces more thrust and torque than the increase of thrust and torque due to the increase of rotating speed. In the ice blockage environment with constant rotating speed and variable flow speed, the thrust and torque of the propeller are affected by the ice blockage and cavitation. When the cavitation is severe, the thrust and torque no longer increase with the decrease of the blockage distance. The reverse performance of the two-way propeller is worse than the forward performance. The larger the advance coefficient is, the greater the performance difference is. When the advance coefficient is 0.7 in the uniform flow environment, the difference of the thrust coefficient is about 80%. With the increase of ice-propeller spacing, the hydrodynamic difference increases insignificanty. Cavitation is continuously generated on the blades, and quickly collapses when it is separated from the blades. With the decrease of the ice-propeller spacing, the cavitation phenomenon on the surface of the blade near the ice is more serious, the larger the area of cavitation is, the more irregular the shape of the cavitation will be.
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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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