Design of a Centrifugal Compressor and Radial Inflow Turbine Stage for a Supercritical CO2 Cycle

Designing Turbomachinery Components for Supercritical CO2

The inverse design method, which has been successfully applied to the ideal gas, is extended to applications for the real gas by using a real gas property lookup table. A fast interpolation lookup approach is implemented which can be applied both in superheated and two-phase regimes. This method is applied to the design of a centrifugal compressor blade and a radial-inflow turbine blade for a S-CO2 recompression Brayton cycle.

In this paper a design study of S-CO2 compressor and radial turbine used in a recompression Brayton cycle using 3D inverse design method is presented. For the first time, the real gas effect is implemented in the inverse design and is validated by comparing the blade loading (blade surface static pressure) from 3D inviscid inverse design and 3D viscous CFD simulation. The aerodynamic performance and flow field of the compressor and the turbine are investigated by CFD and their structural strength is evaluated by static structural analysis.

In this paper you will:

  1. Learn about the development of supercritical CO2 and the challenges it presents
  3. Understand how the real gas effect was brought into the inverse design method using a lookup table
  5. Discover how the method was validated using the blade loading obtained from the inverse design along with 3D CFD simulations

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