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| Multi-Objective Optimization Design of Meridional Profile of Centrifugal Compressor with Low Specific Speed |
| DOI：10.13949/j.cnki.nrjgc.2023.02.011 |
| Key Words:meridian flowpath impeller optimization centrifugal compressor multi-objective optimization fuel cell |
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| Abstract:A combined leading/trailing edge swept low specific speed centrifugal compressor impeller was taken as the research object， and the meridian profile control points of the impeller were selected as optimization variables. And a sample database was constructed by combining the Latin hypercube experimental design method. The Kriging prediction model was established to explore the nonlinear relationship between optimization variables and aerodynamic performance through the training of sample data. Based on the prediction model， the SPEA–Ⅱ multi-objective optimization algorithm was used for multi-variable optimization to achieve the maximum isentropic efficiency under the design and the non-design condition， and the entire stage calculation and analysis of the impeller flow field were carried out. The optimization results showed that the isentropic efficiency of the compressor increased by 2.69 percentage points and 0.45 percentage points under the design and the non-design condition， respectively. The stage pressure ratio was improved under the large flow condition， while slightly decreased under the small flow condition. The operating range expanded significantly with increasing blocking flow. For the impeller flow field， clearance leakage and flow separation were suppressed because the front curvature of the meridian flowpath decreased. The reduction of the flowpath rear height led to a decrease in the passage diffusion， which increased the flow velocity at the outlet and reduced the flow loss of the low-speed flow mass. |
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