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all normalized by the value of rVo at the leading edges of the main blades. The distances along the hub and the shroud have been normalized by the diameter. Along the shroud, a maximum value of 2 for O8 has been selected for all cases; the region for which (7, ),ma, = -2.0 is chosen to extend as far downstream as possible so long as it does not result in reversed loading (i.e., an "overshoot" in the curve of arve). Along the hub, the loading distribution has a triangular shape with ( 2 )A-B set to positive values for case a and c (see Table III and IV). For case b it is set to zero. The resulting main blade cross-sections at constant z are shown in Fig. 6.4a, 6.4b, and 6.4c. In these cases the blades have been stacked at the leading edge. The computed results indicate that as the splitter blade length is increased, the reduction in the lean angle at the trailing edge of the main blade is rather insignificant. In fact, case b has a larger wrap angle at the trailing edge (more than -2.4 radians) compared to that of case a and c. This may be attributed to the fact that the region over which the loading is maximum for case b has been extended for a finite length. The corresposing reversed flow regions on the pressure sides are shown in Fig. 6.5a, 6.5b, 6.5c for the main blades and in Fig. 6.6a, 6.6b, and 6.6c for the splitter blades. We observe that the splitter blades with lengths of 0.53 and 0.61 have eliminated reversed flow regions on the pressure side of the main blade entirely. However, when the length is increased to 0.65 (case c), small reversed flow regions are observed to appear on the pressure sides of both the main and splitter blades. Hence we may deduce that increasing the length of splitter blades does not necessarily reduce or eliminate the inviscid reversed flow region. Moreover, the increasing length of the splitter blades will result in additional profile loss in real flow. The elimination of the reversed flow region can be attributed to the nature of the specified loading, and not the extent of the splitter blade. This gives a good indication that we are taking a step in the right direction: we add splitter blades to allow us the flexibility of tailoring the loading on the main blades appropriately.PDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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