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10 9 8 7 6 5 4 3 2 1 Main Compressor and Labyrinth Mass Flow Rate CBC_081202_1003.csv 60000 50000 40000 30000 20000 10000 MassFlow LeakageFlow1 RPM1 Power1 00 12310 12320 12330 12340 12350 12360 12370 12380 Time(s) Figure 5-10: Measured mass flow rate and labyrinth seal leakage flow rate (lb/s) as a function of time. At ~12335 s the flow control valve was closed in a series of steps resulting in a decrease in flow from 8.7 lb/s to 3.6 lb/s. The data provided in Figure 5-10 was used to make the performance maps. The maps consist of two curves. The first is shown in Figure 5-11 and plots the corrected or equivalent specific enthalpy change as a function of corrected or equivalent flow rate. The corrected values account for differences between the actual temperature and pressure at which the data was taken and the reference values. These equations are described in Glassman, 1972 and in Noalls 2008. The black lines show the predicted values and the markers show the measured values. The change in enthalpy values are based on the measured temperature and pressures. The second performance map (see Figure 5-12) compares the measured efficiency with the predicted efficiency. The efficiencies are based on the measured motor controller power with corrections to account for windage losses and pump vane power losses which are estimated to be 17% of the windage losses. The windage losses are significant and must be included. The windage losses use the correlation by Vrancik (Vrancik, 1968) and depend on the measured rotor cavity density and viscosity which are estimated from the measured rotor cavity pressure and temperature. The efficiency plots are shown at 56 Mass Flow (lb/s)/ Density (lb/ft^3) / dP201 (In H2O) RPM & Motor Power (W)PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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