Coupling optimization of supercritical carbon dioxide centrifugal impeller

LU Xue; LI Xiaojian; LIU Bin

doi:10.19666/j.rlfd.202302016

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Coupling optimization of supercritical carbon dioxide centrifugal impeller

更新时间：2025-09-28

- Coupling optimization of supercritical carbon dioxide centrifugal impeller
- Thermal Power Generation Vol. 52, Issue 11, Pages: 10-19(2023)
- 作者机构：
  
  1. 天津大学机械工程学院
  2. 中国航发湖南动力机械研究所
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202302016
  CLC： TH452
- Published：2023
- 稿件说明：
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LU Xue, LI Xiaojian, LIU Bin. Coupling optimization of supercritical carbon dioxide centrifugal impeller[J]. Thermal power generation, 2023, 52(11): 10-19.
DOI：

LU Xue, LI Xiaojian, LIU Bin. Coupling optimization of supercritical carbon dioxide centrifugal impeller[J]. Thermal power generation, 2023, 52(11): 10-19. DOI： 10.19666/j.rlfd.202302016.

摘要

自循环机匣处理能够显著提升超临界二氧化碳离心叶轮小流量区域的气动性能，但对大流量工况附近的性能提升不明显。为此，考虑自循环机匣与叶轮关键参数的耦合效应，对机匣几何和叶轮叶片掠角实施耦合优化，实现了叶轮性能的全面提升。耦合优化后叶轮在大流量工况、设计工况及小流量工况下的效率分别提升了3.51%、2.60%、4.43%。耦合优化的扩稳增效机理为：在大流量工况下改善了叶片前缘进口攻角，减小了叶轮内部亚临界区，抑制了冷凝的同时改善了叶轮内部流通能力；设计工况下机匣的抽吸量增大，叶顶附近更多低能流体被移除，改善了叶轮下游流场结构；小流量工况下显著减小了叶轮内部堵塞面积，叶轮流动稳定性增强，同时改善了机匣回流造成的掺混损失，叶轮效率提升。

Abstract

Self-recirculation casing treatment can significantly improve the aerodynamic performance of the supercritical carbon dioxide centrifugal impeller in small flow rate region

but the improvement is not obvious near the large flow rate region. Therefore

the coupling effect between the self-recirculation casing treatment and the key parameter of the impeller is considered

and the coupling optimization of the casing treatment geometry and the impeller blade sweep angle is carried out to achieve a comprehensive improvement of the impeller performance.After the coupling optimization

the efficiency of the impeller is increased by 3.51%

2.60% and 4.43% respectively under the large flow rate condition

the design condition and the small flow rate condition. The mechanisms of the coupling optimization for stability and efficiency enhancements are as follows. Under the large flow rate condition

the flow incidence angle of impeller is improved

the subcritical zone inside the impeller is reduced

then the condensation is suppressed and the flow capacity of the impeller is improved. Under the design condition

the recirculation flow of casing treatment is increased

more low-energy fluid near the shroud tip is removed

and the flow field structure downstream of the impeller is improved. Under the small flow rate condition

the internal blockage of the impeller is effectively reduced

the flow stability of the impeller is enhanced

and the mixing loss caused by the recirculation flow is improved

so the impeller efficiency is improved.

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