工程热力学

Performance and Sizes of sCO2 Multistage Axial Compressors at Various Power Capacities

  • WANG Tianze ,
  • XU Jinliang ,
  • ZHENG Haonan ,
  • QI Jianhui
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  • 1. Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 100026, China
    2. Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University), Ministry of Education, Beijing 102206, China
    3. School of Energy and Power Engineering, Shandong University, Ji’nan 250061, China

网络出版日期: 2025-03-04

基金资助

This work was supported by the Natural Science Foundation of China (52130608, 51821004).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

Performance and Sizes of sCO2 Multistage Axial Compressors at Various Power Capacities

  • WANG Tianze ,
  • XU Jinliang ,
  • ZHENG Haonan ,
  • QI Jianhui
Expand
  • 1. Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 100026, China
    2. Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University), Ministry of Education, Beijing 102206, China
    3. School of Energy and Power Engineering, Shandong University, Ji’nan 250061, China

Online published: 2025-03-04

Supported by

This work was supported by the Natural Science Foundation of China (52130608, 51821004).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

摘要

超临界二氧化碳(sCO2)循环可由多种能源驱动,是未来的研究热点。为了帮助用户获得比预设压缩机效率的文献更准确的结果,我们提出了一个完整的模型,在压缩机的性能、尺寸和功率WC、入口温度Tin、入口压力Pin 和压力比ɛ等参数之间建立联系。压缩机的特征尺寸lc、叶型损失Yp和叶顶间隙损失Ycl 都与WC的幂成正比,幂值分别为 0.5、-0.075 以及 -0.5~0。压缩机等熵效率ηtt随着WC的增加单调递增,且效率曲线逐渐平缓。当压缩机转速取运行工况对应的最佳值而非3000 r/min时,压缩机效率有所提高,且压缩机效率-功率曲线更加平缓。当PinTin接近临界点时,压缩机效率增加。当ɛ增加时,压缩机效率呈抛物线分布,这种分布形式是由级内损失变化与叶片压力分布两因素共同导致的。由于各损失项的占比对压缩机功率不敏感,因此压缩机效率与温压参数的关系在全容量范围内相对稳定。压缩机效率图有助于估算系统性能,而不可逆损耗和特性长度的比例法则以及恒定标准分析有助于理解不同容量压缩机的特性。

本文引用格式

WANG Tianze , XU Jinliang , ZHENG Haonan , QI Jianhui . Performance and Sizes of sCO2 Multistage Axial Compressors at Various Power Capacities[J]. 热科学学报, 2025 , 34(2) : 352 -373 . DOI: 10.1007/s11630-025-2091-8

Abstract

The supercritical carbon dioxide (sCO2) cycle can be powered by traditional as well as clean energy. To help users obtain more accurate results than the literatures with pre-set compressor efficiency, we proposed a complete model to establish a link between the performance, sizes of compressors and parameters such as power WC, inlet temperature Tin, inlet pressure Pin and pressure ratio ɛ. Characteristic sizes of compressors lc, profile loss Yp and clearance loss Ycl are all proportional to powers of WC with powers of 0.5, –0.075 and –0.5 to 0 respectively; the scaling laws are constant in the range of capacities from 20 MW to 200 MW. The compressor isentropic efficiency ηtt grows as the WC increases, and the curves become gentle. Compressor efficiency improves over the full power range when the speed is changed from standard speed to the optimal speed; the ηtt curves turn soft as the n increase. As the Pin and Tin approach the critical point, the ηtt increase. Compressor efficiency follows a parabolic curve as the ɛ increases, this parabolic distribution results from the tradeoff between the change in losses and the pressure distribution of blades. The ηtt versus Pin, Tin and ɛ relations are similar at various capacities because of insignificant changes in the distribution of losses. Compressor efficiency maps facilitate the estimation of system performance, while scaling law for irreversible losses and characteristic lengths, along with constant criterion analyses, aid in comprehending the characteristics of compressors across various capacities.

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