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Table 4.3 contains the eight possible combinations of loss models used to obtain a total minimum-loss prediction. Table 4.3 Rotor 1-B Evaluation of Minimum-Loss Prediction Experimental Koch Koch Lieblein Lieblein Swan Swan Hearsey Hearsey Total + + + + + + + + Minimum Koch Miller Koch Miller Koch Miller Koch Miller Loss + + + + + + + + Koch Koch 0.097 0.101 0.125 0.044 0.067 0.087 0.049 0.042 0.042 0.046 0.036 0.036 Koch Koch 0.147 0.171 0.092 0.112 0.052 0.052 0.042 0.042 0.026 0.037 Koch Koch 0.198 0.222 0.126 0.146 0.064 0.064 0.054 0.054 0.051 0.062 Koch Koch 0.117 0.141 0.089 0.109 0.069 0.069 0.063 0.063 0.025 0.036 MEAN ERROR 0.011 0.022 In Table 4.3, the titles for the predictions contain the names of the blade profile loss model + shock loss model + damper loss model. The second, third, fourth and fifth rows of the table contain the total minimum-loss results from Rotor 1-B’s 100%, 90%, 70%, and 50% corrected speed lines, respectively. It should be stated that the 100% and 90% corrected speed lines contained supersonic relative inlet Mach numbers, and the 70% and 50% corrected speed lines contained subsonic relative inlet Mach numbers. The combination that displayed the smallest mean error over the entire range of corrected speeds was the combination of Koch and Smith shock, blade profile, and damper losses. The mean error between the experimental value of total loss and the Koch and Smith combination was .011. Results were then broken down into those applicable to subsonic and supersonic inlet relative Mach numbers. For the case of supersonic relative inlet Mach numbers, again the Koch and Smith combination of shock, blade profile, and damper losses was clearly superior with an error of .016. However, in the subsonic case the Lieblein correlations for blade profile loss combined with Koch and Smith 39PDF Image | Gas Turbine Design Axial Flow Compressors
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