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Because the distance along the hub is greater than that along the shroud, the wrap angle at the trailing edge is thus more negative on the hub than on the shroud. To have radial blade shape, the wrap angles at the trailing edge on the hub and the shroud should approximately be the same. This suggests that we have to specify an rV0 distribution such that the value of WO decreases more on the shroud than on the hub from the stacking axis to the trailing edge. This observation leads to the development of an indicator which will be referred to as the "Wrap Factor" in the following. Neglecting the last term in Eq.(6.1), the blade boundary condition reduces to: 8f, 1W a =j1We (6.2) sr (V, where s denotes the meridional distance along the blades (Ref.8, Eq.(5.3)). This sug- gests that if we integrate the value of -w with respect to the distance along the hub and the shroud from the stacking position to the trailing edge and take the difference between them, we will get some guidance on how to make the blade filament at con- stant z more radial. This integrated value will be referred to as the Wrap Factor which is given below: rtraiingedge W Wrap Factor= ( ds)hub,- -trailing edge W ai (t.ki ds)shroud (6.3) Jatacking azis r The Wrap Factor has little to do with the real flow field, nor does it take into Jetacking azia T account the mean meridional velocity V, in Eq.(6.2), which is not known a priori before a converged solution of the blade shape is obtained. On the contrary, the values of F& and the distances along the hub and the shroud are precisely known once we specify the geometry and the rV9 distributions along the hub and shroud. As will be shown below, it is possible to use the Wrap Factor as a measure of the degree of curvature in the blade filament; this can be done a priori without having to implement the design calculation. If the values of the mean meridional velocity on the hub and the shroud are the same at the same axial location and if the last term in Eq.(6.1) is indeed small, then wePDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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