Effect of Inlet Guide Vanes on Flow Behavior and Performance of S-CO2 Centrifugal Compressors
The supercritical carbon dioxide(S-CO2)Brayton cycle is widely recognized as a promising power cycle,where the performance of the S-CO2 compressor is crucial in determining the thermal efficiency of the cycle.In this study,the effect of the pre-swirl angle on the flow behavior and performance of the S-CO2 centrifugal compressor with inlet guide vane is investigated by numerical simulation.It is observed that an increase in the absolute value of the pre-swirl angle exacerbates flow separation on the suction side of the guide vane,elevating the total pressure loss within the guide vane section and intensifying flow non-uniformity at the impeller inlet.With the increase of the positive pre-swirl angle,the relative flow angle and relative velocity at the impeller inlet decrease,the expansion of the suction side of the blade accelerates and the flow separation weakens.The large positive pre-swirl angle results in a two-phase flow within the inlet guide vane section under high flow conditions.A reference for the study of inlet guide vane regulation of S-CO2 centrifugal compressor is provided by this research work.
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