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Off-design speeds (choose 6)(ratio to design speed) 1.2 1.1 1.0 0.9 0.8 0.7 Figure B.1: The input file for RGRC Currently, RGRC does not include other fluid options, but they could be added. This will require the development of a critical velocity database for any new fluid and polynomials for its fluid properties in the range of interest would greatly help to reduce computing time. For the time being, only CO2 can be used in RGRC. Mass flow rate, pressure ratio, inlet fluid conditions, and velocity will be determined by the application of the compressor. The hub diameter will be determined by the dimensions of the shaft required for the torque. The other inputs are flexible and can be chosen by the user. Some guidance for each input is given in Table B.1. Table B.1: RGRC inputs and their suggested ranges Number of blades at input Splitter Blades Thickness of blades (inlet) Thickness of blades (outlet) Axial height of blades (outlet) Blade clearance Impeller backsweep 17 to 35 recommended will help to avoid stall, but there is an efficiency penalty should be a few percent of the hub diameter See discussion to follow* About 2 % of the outlet diameter, but could be 1 % to 4 % 2 % to 4 % of blade height Anywhere from 20 o to 60 o *The thickness of blades at the impeller outlet will depend on the impeller diameter, the blade height, and the rotational speed. The designer should ensure that there are no undue stresses on the blades and thicker blades will be needed when the stresses are high. This is one area where the calculations in RGRC are lacking. There is no determination of the stresses within the blades, and therefore it can be difficult to judge whether or not the blade thickness is appropriate. The output from RGRC will be in the form of a text file, output.txt. This file contains all the information needed to produce a compressor map. Figure B.2 shows the top portion of an RGRC output. 137PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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