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The resulting main blade shapes are shown in Fig. 6.18a for case f and in Fig. 6.18b for case g. From the results in Table 6.1, there appears to be a correlation between the Wrap Factor and the lean angle at the trailing edge. Thus the Wrap Factor may be used as an indicator of the curvature of the blade filaments. The distribution of -I along the hub and shroud for case d, f, and g are shown in Fig. 6.19a, 6.19b and 6.19c. The values are not plotted against the distances along the hub and the shroud since they are different, but rather they are plotted against the node number in the streamwise direction so that they coincide at the leading edge and the trailing edge. There are several observations that can be made. In the first place, we see from the above table and from Fig. 1.6, 6.11, 6.18a, and 6.18b that as the Wrap Factor is increased, the blade cross sections at constant z get more and more radial, and it is optimal at Wrap Factor of approximately 0.35. This implies that the values of V. are not the same along the hub and the shroud (see Eq.(6.2) above). Secondly, the wrap angle difference near z = 0.05zT.E. does not get smaller with an increase in the Wrap Factor. This is to be expected since the Wrap Factor pertains to a region downstream of the stacking axis. One could also construct a second wrap factor; however, as will be shown in the following section, there is an alternative way that provides a simpler means of controlling the wrap angle near the leading edge. Thirdly, the resulting splitter blade shapes at constant z section are shown in Fig. 6.20a, 6.20b, and 6.20c for cases d, f, and g, respectively. These figures show that the splitter blades themselves do not get more radial with an increase in the Wrap Factor. The main blade and the splitter blade should have approximately the same camber distribution if the term (V)bLj Vai in Eq.(6.1) is small; however the computed results imply that this is not the case. The influence of (V)bj Vaj term can also be seen in the relative angular distance of the splitter blade a, of which the maximum and minimum values are tabulated in Table II as a fraction of the local pitch (the angularPDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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