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Outline
In view of the problems of high noise and poor acoustic performance in the fresh air system of air conditioners，this study takes the fresh air system of a centrifugal fan for air conditioners as the research object and conducts research and analysis on the layered structure of centrifugal fan blades.Adopting the method combining numerical simulation and orthogonal experiments，the effects of the blade height ratio of upper and lower layers，the offset angle of upper and lower blades，and the number of lower‑layer blades on the aerodynamic performance of the centrifugal fan were analyzed.The research results show that the main parameters affecting the flow rate of the fan system，in order of significance，are the blade height ratio，offset angle，and number of blades.By optimizing these impeller structural parameters，the flow field in the flow passages between blades near the rear plate and at the volute bottom can be effectively improved，thereby enhancing the aerodynamic performance.Specifically，when the blade height ratio，offset angle，and number of lower‑layer blades are adjusted to 4.5，3.5°，and 57 respectively，the air volume increases by 6% at the same rotational speed，while the total noise level remains comparable.Furthermore，the low‑frequency broadband noise （0~600 Hz） is reduced by 2.1 dB（A），and the cavity noise is significantly attenuated.The research results can provide a reference for the aerodynamic optimization and noise reduction design of similar fresh air products.
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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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