Abstract: In order to predict the characteristics of the multi-stage compressor, the attack angle calculation model, the efficiency calculation model and the rim power calculation model in the 1D(one-dimensional) calculation program are corrected by single stage 3D(three-dimensional) calculation, so that the stage characteristics predicted by the 1D calculation is more suitable to the blade used in the calculation, and reduces the error caused by the data-transferring at the mixing plane of the 3D calculation. This method can achieve a better prediction of the compressor characteristics, meanwhile reduce the resources and time consumed by using 3D calculation to predict the compressor performance. Taking an 8-stage compressor as the calculation model to verify the proposed method. The results shows that, compared with the 1D calculation prediction without corrected, the 1D prediction corrected is closer to the experimental results. Under the same pressure ratio, the flow difference between the three-dimensional calculation and the test result is about 1.18%, while the 1D calculation and the experimental result flow deviation after scaling is reduced to 0.29%. The corrected 1D calculation is more accurate in predicting the lag angle and attack angle of compressor blade. The proposed 1D program correction method based on dimension scaling can better predict the characteristics of multi-stage compressors.

Key words: performance prediction, axial multi-stage compressor, one-dimensional calculation, rotor/stator interface, stage-stacking method