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Chapter 4 Off-Normal Compressor Characteristics 4.1 Introduction The single most compelling reason for preferring use of a radial rather than an axial main compressor is the much wider operating range (between stall and surge) of the radial machine. Hence the final selection of type may come down to component/PCS performance during transients. This evaluation is a separate task in the subject project, in which the GAS-PASS PCS dynamics code is being modified to handle non-ideal, near- critical working fluids. Thus maps of radial compressor off-normal operating characteristics must be developed in the specific format needed by GAS-PASS. Turbomachinery analysts differ in their choice and normalization of parameter groupings for such maps. The convention adopted for GAS-PASS is to employ efficiency and pressure ratio curves (both normalized by their full power values) as a function of mass flow rate (again normalized), for a range of shaft speeds (again normalized). Fig. 4.1 shows the input developed earlier in this project for the axial main compressor. For comparison Fig. 4.2 shows radial compressor (non-normalized) operating maps from Ref. [4.1] for a conventional (ideal gas) machine. Both are useful frames of reference for comparison later with our radial, real gas compressor maps. Fig. 4.1 AXIAL Main Compressor Off-Normal Performance Map 24PDF Image | Radial Compressor Options for Supercritical CO2 Power Conversion Cycles
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