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η = g(φ) (4-4) For a radial compressor, flow coefficient is defined by Eq (3-3). For an axial compressor, flow coefficient is defined as φ = Vx (4-5) U In general for high-pressure compressors, the Mach number effect becomes quite significant. For the pressure ratio (of ~ 2.6) used by the S-CO2 cycle, the low speed representation might be sufficient. The following figure shows a compressor map plotted in a different way. The compressor has a pressure ratio of above 2, which is quite close to the pressure ratio for our S-CO2 cycle. The example shows that Mach effects are not significant for a radial compressor with pressure ratio of 2. Figure 4.4 A Compressor Performance Map Represented in Two Different Ways. The Compressor Is a Radial Type with Pressure Ratio of 2.2 One implication is that for the current application, the compressor characteristics can be represented using an approach for incompressible flow (i.e. for a pump). Therefore the way in which compressor maps are represented in GAS-PASS is an acceptable approximation for the S-CO2 cycle. 4.3 Constructing an Off-Normal Performance Map for a Radial Compressor Based on the previous discussion, we conclude that for the pressure ratio of the S- CO2 cycle, the low speed assumption is still a good approximation, if we assume that the behavior of our compressor is similar to a conventional compressor with ideal gas. It is still a significant challenge to develop a reliable method for prediction of a compressor map if the inlet fluid is near its critical point. Current knowledge is not sufficient for 27PDF Image | Radial Compressor Options for Supercritical CO2 Power Conversion Cycles
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