Mechanical Engineering Science

Aerothermodynamic Design and Flow Characteristics for a S-CO2 Radial Inflow Turbine

HULehao, JIANGYu, DENGQinghua, ZHAOZhuobi, LIJun, FENGZhenping

Abstract


In this paper, a radial inflow turbine is designed for the 150 kW S-CO2 Brayton cycle system, and flow characteristics and off-design performances are analyzed. The design results are accurate and high performances can be achieved for the S-CO2 power system, and the total-static efficiency of 86% and net output power about 285.2 kW can meet the design requirements of S-CO2 cycle system. The results of the flow characteristics show the streamlines of radial inflow turbine distribute uniformly, and the vortexes generated at the shroud of the blade suction surface have little influence on the turbine performances. The off-design performances show the total-static efficiency remains above 80% in the pressure ratio range of 1.6 ～ 2.9, and the output power and mass flow rate increase with the pressure ratio increasing. It is indicated the that the designed turbine has excellent off-design performances and can meet the operation requirements. The study results can provide guidance for S-CO2 radial inflow turbine design and operation.

Keywords


supercritical carbon dioxide; radial inflow turbine; flow characteristics; off-design performances

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DOI: https://doi.org/10.33142/mes.v3i2.6724

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