Full
Outline
Casing treatment improves the flow stability of turbocharger centrifugal compressors，but often leads to additional aerodynamic losses. Based on the optimal Latin hypercube sampling，radial basis function(RBF) neural network and gradient mutation hybrid optimization algorithm，a coupling optimization of the impeller and the casing treatment for a turbocharger centrifugal compressor was implemented by taking the efficiencies of the large-flow-rate condition，the design condition and the near-stall condition as the optimization objectives. Results show that the efficiencies of the large-flow-rate condition，the design condition and the near-stall condition are increased by 3.90%，3.02% and 1.10%，and the pressure ratios are improved by 9.28%，6.38% and 4.49%，respectively. The choke flow rate is increased by 1.13%，and the stable operating range is expanded by 0.83%. Compared with the solid casing compressor，the efficiencies of the design condition and the large-flow-rate condition are improved by 1.70% and 0.68%，respectively. The coupling optimization realizes the improvements of aerodynamic performances of the compressor in all operating conditions，and solves the problem of the traditional optimization that the aerodynamic performances of the design condition or the large-flow-rate condition decrease after introducing the casing treatment. By combining the global sensitivity analysis of the design space and the comparative analyses of the flow fields before and after optimization，the mechanisms of stability and efficiency improvements of the centrifugal compressor are obtained.
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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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