In this research an analytical model for performance prediction of centrifugal compressors is developed. The loss mechanisms are investigated in impeller, diffuser and volute separately for wide operating rotational speeds of the compressor. The contributions of compressor components in total entropy generation are further studied using different experimental correlations and methods. The results are verified using experimental test results, carried out at Sharif University of technology Turbocharger laboratory which has been designed to derive performance curves of turbocharger compressors. The test rig is equipped to measure static and stagnation pressures at inlet and outlet of each component to determine the total pressure drop of each one. The model results show good agreement with experimental results.

The results show the losses which are related to the impeller are higher than stationary component losses at design and off design operating conditions and the incidence loss is the main source of entropy generation in off design conditions. Also the diffuser losses increase with increasing mass flow rate while volute losses decrease.

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