Analysis of influence of structural parameters on performance of CO2 centrifugal compressor
To study the influence of key structural parameters on the performance of CO2cen-trifugal compressor,one-dimensional design and three-dimensional numerical simulation were car-ried out for the first stage in the low pressure section of a MW-level compressed CO2 energy stor-age system.Based on the model,the influence of four key structural parameters,namely the number of blades,the top clearance,the installation angle of the blade outlet and the relative width of the impeller outlet,on the compressor performance was studied.The results show that the installation angle of the blade outlet and the top clearance have the greatest impact on the perform-ance of the centrifugal compressor,followed by the number of blades and the relative width of the impeller outlet.Increasing the installation angle of the blade outlet can significantly improve the working capacity and pressure ratio,but too large the angle will increase the flow loss and reduce the efficiency.As the top clearance increases,the leakage flow will become more serious,which will affect the performance of the compressor.Reducing the number of blades will reduce the fluid constraint of the blades,and it is easier to produce flow separation.The relative width of the im-peller outlet is related to the design flow rate of the compressor,and too small the relative width will increase the loss of friction and leakage,which in turn will affect the performance of the com-pressor and the range of operating conditions.
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