Influence of splitting blade length and circumferential position on the aerodynamic performance of hydrogen centrifugal compressor
In order to investigate the mechanism of the influence of the splitting blade length and circumferential position on the performance of hydrogen centrifugal compressor,the numerical simulations of hydrogen centrifugal compressor models with different structural parameters were carried out using NUNECA software,and the characteristic lines and internal flow fields of the compressor were investigated in depth to obtain the performance law of hydrogen centrifugal compressor with different splitting blade lengths and circumferential positions.The results of the study show that the addition of splitting blade inside the impeller can reduce the load on the pressure surface of the main blade and delay the separation of the attached surface layer,thus improving the performance of the hydrogen centrifugal compressor to a certain extent,but the excessively long splitting blade will lead to an increase in the contact area with the airflow,making the friction loss in the flow channel increase,and also lead to blockage in the inlet,thus reducing the efficiency and pressure ratio of the compressor.With the increase of the splitting blade length and circumferential position coefficient,the total pressure ratio and isentropic efficiency characteristic line of the impeller as a whole show a trend of first rising and then falling,by analyzing the internal flow field,it was found that the best impeller aerodynamic performance was achieved when the splitting blade length coefficient was 0.8 and the circumferential position coefficient was 0.5.
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