Numerical analysis of pseudo-phase transition behaviors of supercritical CO2 flow in a centrifugal compressor

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2025-03-27 DOI:10.1016/j.supflu.2025.106608

Huimei Wang , Jinliang Xu , Lin Chen

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引用次数: 0

Abstract

The operational instability of supercritical CO₂ compressors near the pseudo-critical line is investigated, with a focus on key regions where pseudo-phase transitions occur. The efficiency, pressure ratio, and fluid property variations of the compressor are analyzed under three different inlet conditions (pseudo-liquid, pseudo-gas, and gas states) at rotating speeds of 30000–70000 rpm. The main findings are as follows: (1) Pseudo-phase transition mainly occurs at the blade tip under pseudo-liquid inlet conditions, forming low-density and high-entropy pseudo-gas clusters; (2) The pseudo-phase transition induces the vortex leading to the instability and low efficiency of the compressor (the worst 30–60 % of the efficiency); (3) The pseudo-phase transition caused by acceleration leads to significant density decrease and a sharp rise in the compressibility factor, weakening fluid compression performance. Based on these results, several strategies for better operation of the compressor are also discussed in aspects of the working conditions and the design of the impeller.

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.