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Operation and Analysis of a Supercritical CO2 Brayton Cycle

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Operation and Analysis of a Supercritical CO2 Brayton Cycle ( operation-and-analysis-supercritical-co2-brayton-cycle )

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1400 1300 1200 1100 1000 900 800 700 600 500 0 45000 40000 35000 30000 25000 20000 15000 10000 5000 0 1600 Prc P301 P400 P500 Pdrain RPM1 SCO2 Compression Loop Pressure Pressure (psia) RPM 200 400 600 800 Time(s) 1000 1200 1400 Figure 5-23: Measured pressure in gas foil bearing test CBC_090626_1303 The compression loop pressure and temperature for this same test are illustrated in Figure 5-23 and Figure 5-24, and the density and flow rate are shown in Figure 5-25. Notice that the drain temperatures approach the bearing temperatures, and that the mass flow rate through the compressor is nearly 5 lb/s with a pressure ratio of about 1.2. The oscillations in the density and flow at the beginning of the test show that the compressor was also operating in the two phase saturation conditions. This type of two phase compressor inlet conditions has been observed many times and causes no problems as the oscillation period is very slow ~ 60 seconds. It is estimated that the period of oscillation is related to the time it takes fluid to flow around the loop. 73

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