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Multi-region oscillation characteristics and hazard of supercritical carbon dioxide in parallel channels natural circulation system

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  • Luo, Qiao
  • Zhou, Yuan
  • Huang, Yanping
  • Huang, Jiajian
  • Hu, Wei
  • Yuan, Yuan
  • Tang, Longchang

Abstract

In order to solve the energy crisis, many countries have actively explored alternative energy and more efficient power cycle systems, among which flexible operation supercritical carbon dioxide (S–CO2) power cycle system with a compact structure has attracted widespread attention. However, the problem of flow instability in the natural circulation parallel channel system needs to be solved. When the oscillation flow instability occurs, it not only affects the operation efficiency, but also cause local damage for system. In this paper, a new experimental facility was established to study the flow characteristics of S–CO2 natural circulation with parallel channels. Three types of flow instability phenomena were observed in the experiment: the systematic oscillation occurs when the outlet temperature of the test section reaches the pseudo-critical temperature. The type Ⅰ oscillation of parallel channels occurs in the low-power region, and the type Ⅱ oscillation of parallel channels occurs in the high-power region. The influences of different system pressures and inlet temperatures on steady-state flow are discussed and the damage of flow oscillation is evaluated. A theoretical model of steady state characteristics of natural circulation is established. The experimental results and theoretical model can provide reference for natural circulation system design and risk assessment.

Suggested Citation

  • Luo, Qiao & Zhou, Yuan & Huang, Yanping & Huang, Jiajian & Hu, Wei & Yuan, Yuan & Tang, Longchang, 2023. "Multi-region oscillation characteristics and hazard of supercritical carbon dioxide in parallel channels natural circulation system," Energy, Elsevier, vol. 267(C).
    • Handle: RePEc:eee:energy:v:267:y:2023:i:c:s0360544222034740
    DOI: 10.1016/j.energy.2022.126587
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    References listed on IDEAS

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