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Again, both Carter models performed well as they did in Rotor 35, with mean errors of 0.71° and 0.76°. The Hearsey model also performed well, with mean errors of 1.23°. The Carter correlation modified by Cetin over-predicted the minimum-loss deviation angle by a mean of 3.12°. As Stator 35 had no mid-span damper and the inlet relative Mach number was subsonic, the blade profile loss was assumed to equal the total loss. This facilitated evaluation of the minimum-loss correlations for Stator 35. Table 4.11 contains the four blade profile loss models used to obtain a total minimum-loss prediction. Table 4.11 Stator 35 Evaluation of Minimum-Loss Prediction Inlet Experimental Mach Minimum Number Loss 0.7710 0.0400 0.729 0.026 0.581 0.029 MEAN ERROR Koch 0.0140 0.0153 0.0197 0.0153 Lieblein Swan 0.0154 0.0175 0.0157 0.0162 0.0171 0.0166 0.0156 0.0149 Hearsey 0.0371 0.0371 0.0371 0.0074 The Hearsey model predicted minimum-loss best with a mean error of only 0.0074. Koch and Smith, Lieblein, and Swan blade profile loss predictions all displayed a mean error of approximately 0.015. 4.3.4 Stator 35 Off-Minimum-Loss and Deviation Angle Prediction Figure 4.18 shows the loss predicted by correlations and experiment for Stator 35 at 100% rotor speed. The range of Mach numbers at the inlet to the stator for this rotor speed was 0.75 to 0.77. 57PDF Image | Gas Turbine Design Axial Flow Compressors
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