Numerical method for simulating high pressure CO2 flows with nonequilibrium condensation

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

A numerical method for compressible flows withnonequilibrium condensation is reconstructed for simulatingsupercritical CO2 flows with nonequilibrium condensationunder high pressure conditions. Thermophysical propertiesare interpolated from pressure-temperature look-up tables anddensity-internal energy look-up tables, which are generatedusing the polynomial equations in REFPROP. We employ thehigh pressure nonequilibrium condensation model in which thecritical radius of a liquid droplet is modified by consideringnon-ideal gas. We simulate high pressure CO2 flows through aLaval nozzle, which was experimentally investigated byLettieri et al. High-pressure CO2 passes through the nozzle,leading to a decrease in its pressure and temperature. It reachesthe supercooled condition near the throat. Nucleation and thesubsequent growth of droplets lead to an increase in thecondensate mass fraction in the diverging area. The proposedmethod for real gas reproduced the peak of pressuredistribution owing to the release of latent heat, whereas thenumerical result assuming ideal gas is different from theexperimental result. The nucleation region obtained using thepresent method is earlier and narrower than that in the case ofideal gas. The early and rapid nucleation leads to the high masscondensate rate at the outlet. These results show thatconsidering the real gas effect and nonequilibriumcondensation is crucial for developing the impeller of acompressor for the supercritical CO2 Brayton cycle.

本文言語English
ホスト出版物のタイトルOil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy
出版社American Society of Mechanical Engineers (ASME)
ISBN(印刷版)9780791851180
DOI
出版ステータスPublished - 2018 1 1
イベントASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 - Oslo, Norway
継続期間: 2018 6 112018 6 15

出版物シリーズ

名前Proceedings of the ASME Turbo Expo
9

Other

OtherASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
CountryNorway
CityOslo
Period18/6/1118/6/15

ASJC Scopus subject areas

  • Engineering(all)

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