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1. The Impeller Inlet (Inducer) 2. Dimensioning the impeller 3. The Impeller Outlet 4. Losses 5. The Vaneless Space 6. The Vaned Diffuser After the design portion is complete, the off-design performance is computed by repeating the above list (with the exception of item 2) for a range of impeller speeds and mass flow rates. 3.3.3 Variable Nomenclature There is a consistent naming scheme to the variables in the code. Numbers 0 through 4 are used to denote positions in the compressor beginning from inlet and going to outlet. 0- Conditions upstream of the compressor 1- Inducerinlet 2- Impeller outlet 3- Vaned Diffuser Inlet 4- Vaned Diffuser Outlet Absolute velocities are designated with a “V”, relative velocities with a “W”, and blade speeds with a “U”. At the inducer inlet a “T” denotes the blade tip, “H” the hub, and “MF” the root mean square radius. A “U” or “M” for tangential and meridional, respectively, will appear as the second letter in velocity components. For example, VU1MF is the tangential component of the absolute velocity at the RMS radius of the inducer inlet. Simpler examples include U1T and U2: the blade tip speeds at inducer inlet and impeller outlet, respectively. The blade tip speed at the impeller outlet (2) does not have a tip and a hub speed because they are equivalent when the blade passage is oriented perpendicular to the rotating axis as at the impeller outlet. Enthalpies, densities, and pressures are saved as structured data types of “total”, “stat”, and “rel”, such that P3.stat is used for the static pressure at position “3”, H1.rel is the relative enthalpy at position “1”, and H2.total denotes the total enthalpy at position “2”. 3.3.4 Impeller Calculations The impeller inlet dimensions are determined from a few inputs from the user. These include hub diameter and the fluid properties upstream of the compressor, including mass flow rate, static pressure, entropy and velocity. RGRC always assumes a zero prewhirl condition, because the design of the inlet guide vanes will depend on many things external to the compressor and will be important for transient control of the cycle as a whole. Prewhirl, however, can be very 55PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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