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Fig. 4.2 Operating Curves for a Conventional (Ideal Gas) Centrifugal Compressor [from Ref. 4.1] The off-normal (or off-design) performance estimation is essential for part load operation, transient simulation, and other changes in operational conditions (for example at different plant cooling water temperatures). It should be noted that off-design performance estimation is a challenging task even for conventional turbomachinery with ideal gas properties. Thus what follows is a first order estimate of the behavior of turbomachinery under off-normal conditions. This work should continue to obtain more reliable calculations of off-normal performance. In this section, aerodynamic scaling is briefly reviewed, and some data are surveyed to give a justification of the current approach which is constructed based on low speed compressor approximations. 4.2 Approach to Off-normal Performance of Compressors for S-CO2 Cycle Based on aerodynamic scaling, for a given compressor (geometry) and ideal gas (constant specific heat ratio, and gas constant), the pressure ratio and efficiency are functions of corrected mass flow (which reflects the inlet Mach number) and correct rotating speed (which is proportional to the Mach number of compressor tip speed). Pt, inlet ⎩ Pt, inlet Tt, inlet ⎭ ⎧&⎫ Pt,exit = f⎨m Tt,inlet , Ω ⎬ = f{m&corr ,Ωcorr} (4-1) 25PDF Image | Analysis of Radial Compressor Options for Supercritical CO2 Power
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