Physical property effects of the compression process with supercritical carbon dioxide as working fluid
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DOI 10.1007/s12206-020-0731-1
Journal of Mechanical Science and Technology 34 (8) 2020 Original Article DOI 10.1007/s12206-020-0731-1 Keywords: · Compressor flow field · Isentropic compression · Physical property effects · Supercritical carbon dioxide
Physical property effects of the compression process with supercritical carbon dioxide as working fluid Jinlan Gou1,2, Kelong Zhang1,2, Yuansheng Lin1,2, Yong Li1,2, Can Ma1,2 and Hanbing Ke1,2 1
Correspondence to: Hanbing Ke [email protected]
Citation: Gou, J., Zhang, K., Lin, Y., Li, Y., Ma, C., Ke, H. (2020). Physical property effects of the compression process with supercritical carbon dioxide as working fluid. Journal of Mechanical Science and Technology 34 (8) (2020) 3379~3393. http://doi.org/10.1007/s12206-020-0731-1
Received October 8th, 2019 Revised
January 21st, 2020
Accepted June 1st, 2020 † Recommended by Editor Yong Tae Kang
Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, Hubei Province, 2 China, Wuhan Second Ship Design and Research Institute, Wuhan 430205, Hubei Province, China
Abstract
The compressor is one of the key components in the closed supercritical carbon dioxide (S-CO2) Brayton cycle, but its design method is far from mature. It is naturally expected that the well-established design method of the air compressor can provide favorable guidelines, on the basis of further understanding the effects of the physical property on the compressor flow field. Considering that isentropic compression is one of the core physical processes in the compressor, the physical property effects on this process were mainly investigated in this work. Similarity criterion was considered, and the change rate discrepancy of the main variables in this process between S-CO2 and the ideal air was fully analyzed. Results show that S-CO2 is compressed faster than the ideal air in most cases, along with generating smaller Mach number and larger pressure rise ratio. It is noted the important parameter of the static pressure coefficient distribution with S-CO2 in the compression process is almost the same as that with the ideal air at low Mach number, which is conductive to the extension of the air compressor research experience, but it is quite different at high Mach number. The simulation cases about compressor cascade are further applied and prove the suitability of the revealed physical property effects in the compressor passage. Understanding these effects on the compression process is helpful to improve the design method of the S-CO2 compressor.
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
The closed Brayton cycle operating with supercritical carbon dioxide (S-CO2) has a compact layout and can obtain high efficiency with modest turbine inlet temperature. This type of energy conversion cycle is widely recognized and researched [1, 2]. It was first proposed by Feher [3], and then further discussed by Angelino [4]. Limited by the manufacturing level, th
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