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distance between two successive main blades, 27r/B) for all the cases considered in this study. Ideally, without this term, the main and splitter blades would have exactly the same shapes, and the splitter blades will be exactly halfway between the main blades (a = 50%). Because of the influence of this term, the splitter blade shapes deviate from the middle of the passage between blade to blade and can reach a value of a as high as 78.9% (close to the pressure side of the main blade) and as low as 30.3% (close to the suction side of the main blade) as in case g. The corresponding reversed flow regions for case f and g are shown in Fig. 6.21a and 6.21b, respectively, for the main blades and in Fig. 6.22a and 6.22b for the splitter blades. There are regions of reversed flow on the pressure surface because we have used a class of rVO distribution with a fairly large spanwise gradients. We may now deduce that one has to specify rVe on the hub and the shroud that results in an increase of the Wrap Factor in order to make the blade filament at constant z section of the main blades more radial. A way is to increase the value of (v),Ma on the shroud and reduce it on the hub. The value of (L' ),a, on the shroud for case g is -3.6 and it is much higher than the value of (~ 8),, in Yang's original design calculations, a case of which has a maximum value of -2.5. However, since the plotted rVe distributions are all normalized by the value of rVe at the leading edge of the main blade, the equivalent value of (a '),ma, for case g is -2.2(= 0.62. (-3.6)); this is smaller than the value used by Yang. Hence, the advantage of using splitter blades is that it gives more room for manipulating the rVe distribution so as to alter the Wrap Factor without specifying too high a loading (2r') on either the main blade or the splitter blade; this would be difficult to do if we have main blades only. 6.4 Non-zero Incidence Angle at the Leading Edge In all of Yang's design calculations, the values of 9rVa at the leading edge are always a.PDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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