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0.35 0.5 HT Recuperator Throttle Compressor Throttle Bypass Flow - HT Recupereator Throttle Bypass Flow - Compressor Throttle 0.3 0.25 0.2 0.15 0.1 0.05 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 00 0 0.2 0.4 0.6 0.8 1 Percent Full Power Figure 11.9 Recompressed fraction and bypass flow reference values and their effects cancel out and the turbomachinery operates at its design point. Unfortunately, as was mentioned in the section 11.2.1 the change of the pressure causes the flow split to change. Therefore, if inventory is withdrawn from the cycle and the pressure is reduced, the turbine operates at its design point, but the compressors will have different changes in mass flow rate and operating pressure and therefore will not operate at their design points. In addition, changing the flow split will cause one of the compressors to operate with larger than rated mass flow rate and the second with lower than rated mass flow rate. This will cause the pressure ratio across the recompressing compressor to increase and across the main compressor to decrease. This will require throttling the recompressing compressor outlet to match the main compressor outlet pressure. The reduction of the main compressor pressure ratio will result in an increased pressure ratio across the turbine. To prevent this the bypass valve needs to be opened. Thus the inventory control ultimately leads to bypass control. The way around this problem would be either to use multiple shaft layouts or use compressors with adjustable blading that would adjust their characteristics according to 252 Recompressed Fraction Bypass Flow (%)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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