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COBEM 2021
26th International Congress of Mechanical Engineering
CASE STUDIES OF MODELLING AND STRUCTURAL AND VIBRATION ANALYSIS OF CENTRIFUGAL COMPRESSOR IMPELLERS
Submission Author:
Lucas Nunes de Carvalho , SP , Brazil
Co-Authors:
Lucas Nunes de Carvalho, Diego Zilli Lima, Daniel Dezan, Elóy Esteves Gasparin, Vitor Cesar Nogueira Mattos, Leandro Salviano, Paulo Eduardo Batista de Mello, Fabio Saltara, Jurandir Itizo Yanagihara, Wallace Ferreira
Presenter: Lucas Nunes de Carvalho
doi://10.26678/ABCM.COBEM2021.COB2021-0584
Abstract
The oil extraction on off-shore platforms needs to deal with the CO2 present in the wells with a high oil-gas ratio. In addition to the oil industry, there is also a global environmental motivation to deal with a large amount of CO2 present in Earth’s atmosphere. The most recent researches in the area propose the use of centrifugal compressors to compress the gas and treat it, or even insert it back in the underground wells. This study presents an evolution of modeling and analysis of centrifugal compressors through three case studies. In the first case, using a model known as Eckardt Compressor, and analyzing only the impeller blades, the structural safety factors are calculated, and the possible resonance points are verified using the Campbell diagram. In the second case, using a compressor of stage 1 treatment of supercritical CO2, the ideal material for the impeller is determined, an early design of the impeller disc is performed and, through a previous Design of Experiments analysis, a new geometry that meets the structural safety factors including the burst speed is proposed. In the third case, a stage 4 compressor model used in sCO2 treatment is used, and due to the high-pressure ratio, the need to consider the impeller backplate pressure is evaluated, then an analytical model is identified for the application of the so-called “backpressure”, and to avoid changing the geometry of the blades, a parametric optimization of the disc geometry is performed with DOE, to meet the structural safety factors.
Keywords
Centrifugal Compressor, Campbell Diagram, structural analysis, Optimization, design of experiments
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