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Stabilizing Effects of Supercritical CO2 Fluid Properties on Compressor Operation

Chair of Turbomachinery, Faculty of Engineering, University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
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This paper is an extended version of our paper published in the Proceedings of 13th European Conference on Turbomachinery Fluid Dynamics & Thermodynamics, ETC13, Lausanne, Switzerland, 8–12 April 2019, Paper No. 121.
Int. J. Turbomach. Propuls. Power 2019, 4(3), 20; https://doi.org/10.3390/ijtpp4030020
Received: 8 May 2019 / Revised: 1 July 2019 / Accepted: 12 July 2019 / Published: 17 July 2019
This paper aims to give an understanding of an effect which stabilizes the inlet conditions of compressors for supercritical CO2 (sCO2) operating close to the critical point. The effect was observed during testing of the turbomachine within the sCO2-HeRo project, and is caused by the sCO2 real gas properties close to the pseudocritical line. Under theoretical consideration, strong gradients in the fluid properties around this line—dependent on the static temperature and pressure of sCO2—can result in strong variation of compressor performance and finally lead to unstable cycle behavior. However, this paper demonstrates reduced gradients in density at the compressor inlet when varying the cooling power and taking advantage of a stabilizing effect. The applicable range and the significance of this stabilizing effect depended on the cooler inlet temperature and pressure, and was used to evaluate the relevance for individual cycles. Controlling the cooling power and the measurement of the inlet density allowed control of the compressor inlet conditions equally well, independent of the operating point, even close to the critical point. View Full-Text
Keywords: supercritical CO2; pseudocritical line; compressor; control supercritical CO2; pseudocritical line; compressor; control
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Hacks, A.J.; Schuster, S.; Brillert, D. Stabilizing Effects of Supercritical CO2 Fluid Properties on Compressor Operation. Int. J. Turbomach. Propuls. Power 2019, 4, 20.

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