Modified one-dimensional analysis and two-zone modelling for predicting the performance of radial compressors

摘要

Simulation of centrifugal compressors performance is widely performed by one-dimensional analysis because of relatively reliable results by this method, considering some major modifications in gas properties and analysing compression stages. The compressed medium is mixture of various gasses with different thermodynamic properties and molecular weights, which lead to considerable changes owing to different process and site conditions in many oil and gas applications. The mentioned characteristic changes are not considered in traditional performance prediction methods and result in large errors during estimation. In this paper, modified two-zone and one-dimensional models are presented, in which major variations are considered and numerical solutions are employed to successfully achieve satisfactory performance estimation. Results are verified with experimental data for stage pressure ratios and rotor efficiencies. These comparisons show that the proposed one-dimensional and two-zone models are revised in comparison to conventional techniques and effectively simulate compressors performance.