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radial distribution of resulting main blade camber along constant z section is shown in Fig. 6.11. Indeed this new rVe distribution gives significant improvement in the blade camber distribution. The lean angle along constant z section has been reduced to 25.8* from a value of 56.3* in Yang's original design calculation (see Fig. 1.6). These results appear to indicate that for designing blade with more radial filament along constant z section, one should specify the maximum loading along the shroud to have a value more negative than that along the hub. However, as will be shown in the following section, there is a better procedure to accomplish this (i.e., through the use of the Wrap Factor, to be defined below). The corresponding reversed flow regions are shown in Fig. 6.12a and 6.13a. Ap- parently the large spanwise gradient of rVe that results from the new distribution has caused the reversed flow region to reappear; this is in contrast to the absence of re- versed flow region using the rVe distribution in case b, which is more typical of Yang's distribution with similar maximum loading along the hub and shroud. This is to be expected, since Yang attempted to optimize the aerodynamics without any due con- sideration for the structural constraints; however, we are here attempting to strike a balance between aerodynamics and structural constraints. Nevertheless, we can still attempt to utilize Yang's guideline to move the stacking axis further downstream of the position of maximum loading. The results from this design calculation will be referred to as case e. The resulting reversed flow regions with the stacking position set at J=45 (slightly further downstream than that in case d) are shown in Fig. 6.12b and 6.13b. The reversed flow region on the main blade has been reduced, and the reversed flow region on the splitter blade is now confined to a small extent near the shroud. It appears that a minor alteration in the stacking condition does not influence the extent of the region of reversed flow significantly. The extent of the reversed flow region is far more affected by the rVa distribution.PDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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