科研之友
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摘要
The design and numerical simulation of centrifugal compressor used in transcritical carbon dioxide (TCO2) heat pump cycle are carried out. The numerical simulation method is verified by the transcritical experimental data of MWe supercritical carbon dioxide (SCO2) centrifugal compressor, and the non-linear harmonic method is used for unsteady calculation. The degree of CO2 condensation increase in the passage under large flow transcritical conditions. The two-phase flow was found in tip clearance, which extends the phase change zone to the suction surface of downstream blade and affects the mainstream flow. The condensation phenomenon can be significantly reduced by setting superheat for compressor inlet in TCO2 cycle. The pressure distribution at the end of the blade is affected by dynamic and static interference effect between blade and vane diffuser, and the return vortex in the blade diffuser can be identified more accurately in unsteady simulation.
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