Full
Outline
In order to solve the problem that the inlet flow field of a centrifugal compressor distorts under the elbow intake mode，which in turn has a significant impact on the performance of the compressor，through the self‑designed compressor test device，combined with characteristic tests and PIV flow field measurements，the correlation mechanism between the performance of the compressor and the flow field structure under the elbow intake is quantitatively revealed. The results show that，compared with the straight pipe intake，the elbow intake causes the pressure ratio and efficiency of the centrifugal compressor at the highest efficiency point to decrease by up to 2.7% and 9.8% respectively，indicating that the elbow structure significantly deteriorates the performance of the compressor. PIV testing revealed the presence of a reverse rotating twin vortex structure in the inlet section，whose strength is positively correlated with compressor flow rate and speed； Based on the analysis of the velocity uniformity index of the inlet pipe path cross-section，the interface velocity uniformity is good，and the radial velocity uniformity has a weak influence （the absolute value of γ is less than 0.2）. The asymmetry of the circumferential velocity distribution is strongly negatively correlated with the pressure ratio （γ=-0.976） and efficiency （γ=-0.923），indicating that circumferential distortion is the dominant factor in performance degradation. The research results can provide a reference for the performance improvement of centrifugal compressors.
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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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