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can expect to have the Wrap Factor close to zero for highly radial blade cross sections at constant z. If this is not the case, then as shown below, the value of the Wrap Factor is optimum at a value different from zero. Two additional rVo distributions are considered for evaluating the usefulness of the Wrap Factor; the results from one of these are shown in Fig. 6.16a and 6.17a (this will be referred to as case f) while those from the other are shown in Fig. 6.16b and 6.17b (case g). For case f, the maximum loading along the hub is taken to be the same as that for case d (-1.75); however, the maximum loading along the shroud is made more negative than that of case d. It is taken to be -3.5. This increase in the value of (aV ),,,.. along the shroud is made to obtain a larger Wrap Factor. However, we cannot increase the maximum loading along the shroud further nor can we decrase the maximum loading along the hub to obtain an even larger Wrap Factor as this will result in negative velocity on the blade which causes the inverse design procedure to fail to converge to a final blade shape. For case g, the technique used is to move the position of point A (the point of maximum loading) so that a larger value of Wrap Factor is obtained. The values of the Wrap Factor for case d, f, and g are shown below in Table 6.1 with the corresponding wrap angle differences (or lean angles) at the trailing edge, which is denoted by AfT.E., and at z = 0.05ZT.E., which is denoted by Afo.05. Yang's results as described in Chapter 1 are also included. Table 6.1 Wrap Factor and Wrap Angle Difference Case Yang d f g Wrap Factor AfT.E.(deg) -0.75 56.3 -0.03 25.8 0.11 16.7 0.35 4.7 Afo.o (deg) 05 6.8 11.0 10.0 10.7PDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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