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Table 4.2 Rotor 1-B Evaluation of Minimum-Loss Deviation Angle Prediction % Experimental Speed (deg) 100 6.26 90 4.9 70 5.16 50 5.36 Carter f(B2′) Modified by Cetin Hearsey (deg) (deg) 1.96 2.02 1.67 2.02 1.83 2.02 1.79 2.02 (deg) 4.18 4.18 4.18 4.18 1.24 Carter Modified by f(stagger) Cetin (deg) (deg) 2.00 4.13 2.00 4.13 2.00 4.13 2.00 4.13 3.42 1.29 Mean Error 3.61 3.40 For Rotor 1-B minimum-loss deviation angle, both of the Carter correlations modified by Cetin predicted values with mean differences of 1.24° and 1.29° from the data which was experimentally measured and converted to the relative frame of reference. Again, this was considered accurate in relation to the experiment, as the probes were only capable of measuring angles within the accuracy of ± 1°. However, a 1° difference in deviation can produce up to a 3% difference in the absolute exit total pressure and a 2% difference in efficiency. As can be seen in Table 4.2, the Hearsey model and both unmodified Carter correlations produced errors in minimum-loss deviation angle of over 3°. Evaluating the minimum-loss prediction was the next important step prior to calculating accurate off-minimum-loss predictions. This task was extremely difficult, as only the total loss was determined experimentally as opposed to the loss produced by individual mechanisms. For this reason, there was no means for quantifying with confidence the loss predicted by individual mechanisms, only the total loss obtained by superposing all mechanisms involved. As a result, much of the minimum-loss evaluation was based on previous findings and soundness of theory involved. 37PDF Image | Gas Turbine Design Axial Flow Compressors
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