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3900 3800 3700 3600 3500 3400 3300 3200 Total-to-total Pressure Ratio Total-to-static Pressure Ratio Design Point 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 Pressure ratio Figure 9.16 Turbine characteristics – mass flow rate vs. pressure ratio 9.3.3 Turbomachinery Comparison In comparison with other turbomachinery the CO2 turbines and compressor are very compact and highly efficient. The usual rotor dimension for a helium turbine at synchronized rotational speed is about 1.5 m [Yan and Lidsky, 1993]. For this rotor diameter the helium turbine efficiency is lower than for CO2 and the turbine has more stages than a CO2 turbine. The helium turbine is about 4-5 times longer. Figure 9.17 compares a steam turbine and a helium turbine to the CO2 turbine. In addition to the size reduction, another significant advantage of the CO2 turbine is that it can be a single body design, whereas both steam and helium turbines usually employ more turbine bodies (high, medium and low-pressure in the case of steam, a high-pressure unit to power compressors and a low-pressure unit to power the generator in the case of helium). This further increases the difference in size as additional plena and piping are necessary. The high efficiency turbomachinery can substantially improve the cycle potential. As shown in Chapter 10 using the calculated turbomachinery efficiencies can increase the 223 Mass Flow Rate (kg/s)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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