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The stability line of a compressor is created by maintaining a constant compressor rotational speed and closing the exit throttle. This moves the operational condition of the compressor toward a decreased corrected mass flow rate and increased total pressure ratio along that same speed line. The performance of the machine improves until it reaches a point of unstable operation and an undesirable breakdown in machine performance. The stability line is the locus of these stability points for each of the constant corrected rotor speeds. Since the design point is defined as being close to the maximum efficiency, minimum-loss for the 100% speed typically occurs at or near the design point. Many investigators have also applied design loss theory to minimum-loss points that occur at off-design compressor speeds, with moderate success. In order to obtain an accurate design point stage characteristic, one must not only calculate an accurate design loss, but accurate design incidence and deviation angles as well. Currently, most off-design correlations use implicit or explicit methods in which one of the most important variables is the difference between the design and the off- design incidences. When a range of incidences for the 100% speed line is plotted, the off-design losses usually “bucket” around the design point, where the design point is regarded as the point of minimum-loss (see Figure 2.6). Off-minimum-loss deviation angle is predicted in a similar fashion. 13PDF Image | Gas Turbine Design Axial Flow Compressors
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