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Based on the concept of ‘casing treatment’ technology in aero-engine, a certain number of axial groove structures were set up in the inner wall of a pumpjet propulsor duct to weaken the tip vortex intensity, so as to reduce the pulsating pressure on the inner wall of the duct. By applying DES method and sliding mesh method, the flow around tip vortex field region of an elliptical hydrofoil was numerically simulated. The numerical calculation results are in good agreement with the experimental values, which verifies the reliability and applicability of the numerical calculation method.On this basis, the numerical simulations of the pumpjet propulsor with and without groove structures were carried out, and the effects of groove structure on the tip vortex core pressure, the pulsating pressure on the inner wall of the duct and hydrodynamic performance were compared and analyzed.The results show that the groove structures can significantly increase the tip vortex core pressure, reduce the amplitude of fluctuating pressure on the inner wall of the duct, and has little effect on the hydrodynamic performance.
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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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