Case 2 As case 1 with reduced mass flow of CO 2 of 50 kg/s Case 3 As case 1 with reduced mass flow of CO 2 of 33.3 kg/s Case 4 As case 1 with reduced mass flow of CO 2 of 50 kg/s and the maximum pressure ratio per stage/section increased to 4 to mimic multi-impeller inline centrifugal compressor(s).