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Chapter 6 Results from Design Calculations We will now proceed to present the results from the design calculations carried out in this thesis. Specifically we will focus our effort on examining the influences of rVe distribution, length of the splitter blades, stacking position, I_', non-vanishing first derivative of rV at the leading edge (i.e., finite incidence angle), blockage, and slip factor on the blade shape as well as on the extent of inviscid reversed flow region on the pressure surface of the blades. 6.1 Length of Splitter Blades Three splitter blade lengths are examined; these are 0.53, 0.61, and 0.74, and will be referred to as case a, b, and c, respectively. The numbers represent fractions of splitter blade lengths with respect to the main blade length, which is kept constant. The length itself is calculated as the average of the meridional distances along the hub and the shroud. Using the simple procedure for assigning the rV distribution between the main and splitter blades described in Chapter 5, the corresponding values of rVe at the leading edges of the main blades are 0.65, 0.62, and 0.57, respectively, of the net rVe at the inlet. The meshes used are shown in Fig. 6.1a, 6.1b, and 6.1c where the locations of the leading and trailing edges are indicated as well. The grids are set so that the leading and trailing edges coincide with the quasi-orthogonal grid line extending from the hub to the shroud. The splitter trailing edge for case b has been made more radial for assessing the change in the flow as we increase the length from case a to case c. The rVO distribution for each case on the hub is shown in Fig. 6.2a, 6.2b, and 6.2c and on the shroud in Fig. 6.3a, 6.3b, and 6.3c, respectively. They have beenPDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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