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To investigate the impact of intake configuration on the performance and flow field of a centrifugal compressor，characteristic tests were conducted to measure performance，while PDA and PIV techniques were employed to characterize the inlet‑duct flow.The effects of curved‑duct intake on the compressor′s pressure ratio，efficiency and inlet uniformity were analyzed.The results reveal how a 90° elbow affects both performance and flow behavior.Compared with a straight inlet，the elbow reduces the pressure ratio（-0.8 % to -2.7 %） and efficiency（-1.4% to -9.8%） at the maximum efficiency point across the tested speed range（60 000~100 000 r/min），and the deterioration grows as rotational speed increases.Especially under high‑flow conditons，the decline in pressure ratio and efficiency is more pronounced.When the speed exceeds 70 000 r/min，the circumferential static‑pressure non‑uniformity at the compressor inlet becomes pronounced；The maximum static‑pressure ratio at the 120° location rises from 1.002 8 to 1.011 5.With a straight inlet，the flow at the maximum efficiency point is nearly uniform，whereas the bent inlet generates severe inlet distortion：two counter‑rotating vortex cores appear on the radial section.The research results provide a theoretical basis for optimizing the inlet conditions of centrifugal compressors and improving their actual operating efficiency and stability in the future.
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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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