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A B Figure 5-17: The left image shows an engineering blow up of labyrinth seal. The light blue ring in made of brass and has four teeth that approach the steps on the rotating shaft. The right image shows a photo of the compressor wheel and the four steps on the shaft. Table 5.3: Estimate of labyrinth seal leakage flow rate using the Egli correlation provided by Barber Nichols. Property Value Units Land thickness INPUT Upstream pressure Upstream specific volume Down stream pressure Radial clearance, small delta Diameter of seal Axial space between lands Number of lands Staggered 1=yes, 2= no thick Symbol Po vo Pdown clear Dia space n YorN 0.02 2007 0.025 200 0.0015 0.55 0.05 4 1 psia ft^3/lb psia inch inch inch OUTPUT Leakage area clearance/spacing A ratio 0.002592 0.075 leakage leakage in scfm (of air) units G 0.154463 123.5708 lb/sec cfm Haskel pumps are used to reduce the cavity pressure. These pumps use compressed air to reduce the rotor cavity pressure and then discharge the compressed CO2 back into the loop. The flow path was illustrated earlier in Figure 2-6. The pumping power is determined by the leakage mass flow rate multiplied by the change in enthalpy required to pump the fluid from 200-300 psia to the return pressure which is approximately 1120 psia. Of course this enthalpy change depends on the inlet temperature to the Haskel 65PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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