Full
Outline
In order to explore the energy conversion characteristics of the vacuum cleaner fan，the full‑flow field numerical simulation of the fan flow field under different working conditions was carried out to analyze the flow characteristics.After verification by performance tests，the distribution of the local entropy production rate of the impeller was analyzed based on the entropy production theory.The results indicate that there is an obvious flow impingement at the blade inlet.At the impeller outlet，the mixing of wake and jet increases the velocity gradient and forms a jet wake structure.As the flow rate decreases，large‑scale backflow occurs inside the impeller.Local entropy production is the main factor affecting the energy consumption of the fan.Under the design conditions，the proportion of local entropy production is 59.06%，and the high entropy production area is mainly concentrated at the blade inlet，the suction surface of the blade leading edge and the blade outlet trailing edge.By analyzing the distribution of secondary flow in different annular sections of the impeller，it is found that the secondary flow at the impeller inlet becomes more obvious as the flow rate increases，and the high entropy production areas mostly appear in the regions where secondary flow is generated，indicating that secondary flow is an important factor causing energy loss.
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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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