Abstract
Closed-loop supercritical CO\({}_{2}\) (sCO\({}_{2}\)) cycles are one of most promising power conversion options for the foreseeable future. Experimental studies are necessary for a successful development and deployment of these technologies. This paper focuses on the design of a sCO\({}_{2}\) experimental loop with a supersonic nozzle test section. The expansion process has operating conditions similar to those found at the inlet of supercritical compressors with non-equilibrium condensation. Among the possible cycle configurations, the transcritical refrigeration cycle is preferred for its wide range of applications and the operability in the thermodynamic region of interest close to the critical point. The design of the converging-diverging nozzle is also discussed. The saturation curve is crossed in the diverging section of the nozzle, therefore a non-equilibrium condensation model is presented and validated for an accurate design of the test section. In addition, the validated model is employed to present first results from the designed nozzle.
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Petruccelli, G., Uusitalo, A., Grönman, A., Turunen-Saaresti, T., Zocca, M. (2021). Design of a Closed-Loop Supercritical Carbon Dioxide Wind Tunnel: Numerical Modelling of Non-equilibrium Condensation in a Converging-Diverging Nozzle. In: Pini, M., De Servi, C., Spinelli, A., di Mare, F., Guardone, A. (eds) Proceedings of the 3rd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power. NICFD 2020. ERCOFTAC Series, vol 28. Springer, Cham. https://doi.org/10.1007/978-3-030-69306-0_11
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