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<p>The supercritical carbon dioxide (sCO<sub>2</sub>) 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 <i>W</i><sub>C</sub>, inlet temperature <i>T</i><sub>in</sub>, inlet pressure <i>P</i><sub>in</sub> and pressure ratio <i>ε</i>. Characteristic sizes of compressors <i>l</i><sub>c</sub>, profile loss <i>Y</i><sub>p</sub> and clearance loss <i>Y</i><sub>cl</sub> are all proportional to powers of <i>W</i><sub>C</sub> 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 <i>η</i><sub>tt</sub> grows as the <i>W</i><sub>C</sub> 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 <i>η</i><sub>tt</sub> curves turn soft as the <i>n</i> increase. As the <i>P</i><sub>in</sub> and <i>T</i><sub>in</sub> approach the critical point, the <i>η</i><sub>tt</sub> increase. Compressor efficiency follows a parabolic curve as the <i>ε</i> increases, this parabolic distribution results from the tradeoff between the change in losses and the pressure distribution of blades. The <i>η</i><sub>tt</sub> versus <i>P</i><sub>in</sub>, <i>T</i><sub>in</sub> and <i>ε</i> 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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Tianze Wang,
  • Jinliang Xu,
  • Haonan Zheng,
  • Jianhui Qi

摘要

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 ε. 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 ε 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 ε 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.