The two-stage centrifugal main compressor serves as the cycle's core component, circulating and pressurizing the sCO2 to achieve the required pressure ratio. It delivers a mass flow of 26 kg/s at 24 MPa discharge pressure under design inlet condition, with a rotational speed of 25,000 rpm . Its rigid rotor design and integrated anti-surge control system enable stable performance across various test configurations, including RCBC and SRBC modes.