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Table 5.1: A summary of the S-CO2 compressor wheel operating characteristics and the design dimensions are listed in this table. These values were used in the BNI design tools and the SNL mean line flow analysis code to determine the operating performance characteristics. The design pressure ratio is 1.8. Compressor Operating Conditions Variable Units Value Shaft Speed rpm Shaft Speed rps Inlet Temperature (total) Mass Flow Rate Inlet Pressure Nrpm rev/min Nrps rev/s T.o1 K mdot kg/s p.o1 kPa 75000 1250 305.30 3.53 7687 Compressor Design Dimensions r.tip r.tip m 0.0186817 blade Height Blade tip angle (minus is back swept) Number of exit blades Thickness of blade Shroud Radius Hub Inlet Radius Inlet Blade Angle at tip Exit Vaned Diffuser Angle Tip clearance b.2 m beta.2b deg Z.r t.b m r.s1 m r.h1 m beta.1bt deg alpha.2 deg l.c1 m 0.001712036 -50 12 0.000762 0.009372047 0.002537485 50 71.5 0.000254 5.3.1 Measured Compressor Maps This section of the report describes the test measurements that were used to map the performance characteristics of the main compressor. The goal of these tests was to spin the TAC at a fixed speed and then use the motor driven flow control valve to reduce the flow while recording inlet and outlet temperature and pressure along with the motor controller power. Overall the shaft was rotated at speeds varying from 45 krpm to 60 krpm in increments of 5 krpm. Figure 5-9 and Figure 5-10 show a short section of the pressure, mass flow rate, and power data that was recorded in test CBC_081202_1003. The presented data was recorded while at 55 krpm. In both figures the shaft speed and motor controller power use the secondary axis located on the right side of the graph. The starting compressor inlet temperature and pressure were 304.4 K (88.3 F) and 7.536 MPa (1093 psia) which was very near the critical point (87.8°F /304.1 K and 1070 psia / 7377 kPa). In Figure 5-9 the shaft speed was increased from 10 krpm to 55 krpm in about 10 seconds in a series of steps. These step changes in speed were limited to 15 krpm to avoid over currents in the motor controller. As the speed increases the outlet pressure increases as well. Once the shaft speed reached 55 krpm it was kept constant. At high speed (55 krpm) the compressor outlet temperature increased approximately 11.1 K (20°F). At 12,335 seconds into the recorded data the flow control valve was closed in steps, each valve closure step caused further increases in the compressor outlet pressure which also cause reductions in the mass flow rate. The maximum outlet pressure measured in this phase of the test reached 12.1 MPa (1757 psia). 54PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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