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We note from these results that the length of the splitter blades appear not to have any significant effect on the blade shape. From structural consideration, however, it is desirable to have splitter blades with blade filament being more radial at the trailing edge such as that in case b. For this reason, the splitter blade with length of 0.61 will be examined further for assessing the parametric influence of other key design parameters. 6.2 Stacking Position The effects of stacking position on the flow field have been studied by Yang (Ref.1, Sec. 6.2), and in general, to avoid unacceptable low value of Wb (which causes the solution to fail to converge to the final blade shape), stacking position is chosen to be near where the loading is maximum and preferebly slightly downstream of it. In this section the effect of stacking position on the extent of reversed flow region will be examined in the context of the use of splitter blade in radial inflow turbine wheel. A new distribution of rV is specified for the configuration with splitter of length 0.61, of which the grid is shown in Fig. 6.1b. This will be referred to as case d. The rVe along the hub is shown in Fig. 6.7 and the rV along the shroud is shown in Fig. 6.8. Instead of having an equal value of -2 for ( , a, on the hub and the shroud, the maximum value of V' on the hub is decreased to -1.75 and the maximum value of and splitter blades are shown in Fig. 6.9 and 6.10, respectively. When stacked at the leading edge, this new rV0 distribution fails to give convergent blade shape. So the stacking axis is moved to a location 1/3 chord (J=40) downstream from the leading edge; this corresponds to the location of the maximum loading. The arve on the shroud is increased to -3. The location of maximum , is moved further away from the leading edge. This new rVe distribution along the hub and shroud is rather similar to that used by Zangeneh (Ref. 8) which has yielded a blade shape with a lean angle of no more than 10*. The corresponding swirl distributions on the main 1PDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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