| Texto completo | |
| Autor(es): |
Neto, Murillo S. S. Pereira
;
Antonio, Bruno J. N.
;
Yanagihara, Jurandir I.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 144, p. 14-pg., 2025-07-03. |
| Resumo | |
Integrating hydrogen (H2) in natural gas pipelines presents a promising path towards decarbonization but poses challenges for centrifugal compressor performance. This work investigates the aerothermodynamic effects of varying hydrogen molar fractions (0 %, 10 %, 20 %) on the performance of a centrifugal compressor stage, using Computational Fluid Dynamics (CFD) to analyze the interplay of design and operational factors. The stage, comprising an impeller and vaned diffuser, is generated by a centrifugal compressor design code based on the 1D meanline and 2D streamline curvature methods. Initially optimized for pure CH4 and operating at a fixed flow coefficient, the rotor and stage total pressure ratios decrease from 1.900 to 1.672 and from 1.846 to 1.629 as H2 content increases to 20 % and rotation speed is maintained. Moreover, the stage isentropic efficiency decreases from 91.60 to 91.10 %, indicating notable performance degradation. Two similarity conditions are investigated to maintain the design total pressure ratio. Blade tip Mach number similarity slightly overestimates the rotor total pressure ratio, raising it to 1.913 as H2 content increases to 20 % and elevates the stage isentropic efficiency to 91.41 %. This rotor's isentropic efficiency is maintained between 96.50 and 96.60 % with H2 admixture, which indicates that H2-related losses mainly increase in the vaned diffuser. Rotor total pressure ratio similarity, which considers the effect of H2 on the mixture's isentropic pressure-volume exponent, maintains the rotor total pressure ratio at 1.900 at rotation speeds about 0.7 % slower than those determined with blade tip Mach similarity. Detailed three-dimensional analyses reveal increased mixing losses within the vaned diffuser due to higher H2 content. Mixing losses are pronounced near the vanes' pressure surface and are associated with secondary flow structures, which originated due to the impeller tip clearance effect. Consequently, while centrifugal compressors can handle varying gas compositions, performance degradation is inevitable. This underscores the importance of designing compressors for specific gas compositions to minimize losses, particularly when operation conditions deviate from the design point. (AU) | |
| Processo FAPESP: | 21/04538-1 - Simulação e otimização de um compressor centrífugo de hidrogênio em condições supercríticas |
| Beneficiário: | Murillo Souza dos Santos Pereira Neto |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |