Gas Turbine Design Axial Flow Compressors

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Gas Turbine Design Axial Flow Compressors ( gas-turbine-design-axial-flow-compressors )

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The Creveling, Hearsey model, and Howell correlations all performed fairly accurately over the entire region tested. The correlation that resulted in the minimum RMS error for each speed and regime is highlighted in bold in Table 4.4. 4.3 Evaluation of Models with NASA Stage 35 4.3.1 Rotor 35 Minimum-Loss Incidence, Deviation Angle, and Loss Prediction Table 4.5 shows the minimum-loss predictions of NASA SP-36 and the Hearsey model, also known as CPAC. Table 4.5 Rotor 35 Evaluation of Minimum-Loss Incidence Prediction % Speeds Experiment (deg) 100 3.02 90 3.3 70 4.51 Mean Error NASA SP-36 (deg) Hearsey (deg) 9.35 5.25 9.35 2.46 8.22 4.18 5.37 1.13 The Hearsey model showed a much better agreement with the experimentally measured data than did NASA SP-36, with a mean error of only 1.13°. The Hearsey model also predicted the minimum-loss incidence for the 70% and the 90% speeds to within 1°. For the 100% speed, the Hearsey model exhibited a greater error of 2°. 48

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