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shock structures between 2-D transonic cascades and 3-D transonic rotors in the choke regime. Bloch (1996) suggested that the difference is a result of subsonic flow that exists in the casing boundary layer of the 3-D rotor that is not present in 2-D cascades. This subsonic region allows for downstream pressure information to influence the upstream flow conditions and shock structures. Downstream pressure information cannot travel fast enough upstream through the sonic or supersonic regions found in the 2-D cascades. This may explain why there exists a smooth transition from the started/unstarted regimes in the 3-D rotor and not in 2-D cascades. Predicting accurate deviation angles is equally important as predicting accurate loss models in order to obtain accurate stage characteristics. The Hearsey and Creveling off-minimum-loss deviation angle prediction performed consistently better than all other correlations tested (see Tables 4.4, 4.8, and 4.12). However, in the current evaluation, the accuracy criteria chosen was commonly unmet. The current evaluation is an assessment of the correlation accuracies based on the experimental data for Rotor 1-B and Stage 35. There were many differences in results between the two machines. This suggests that these correlations should be re-evaluated against experimental data from many other rotors and stators before a complete assessment of the accuracy and applicability of each correlation can be made. As with any investigation of predictions, the larger the experimental data base, the more confident the results. The current investigation focused only on the meanline predictions. In order to build more accurate stage characteristics, one must be able to predict the entire spanwise flowfield. Therefore, the correlations must be evaluated over the entire span of the blade. 64PDF Image | Gas Turbine Design Axial Flow Compressors
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