Radial Inflow Splitter Blades in Three-Dimensional

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Radial Inflow Splitter Blades in Three-Dimensional ( radial-inflow-splitter-blades-three-dimensional )

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The general overall effect of increasing the Wrap Factor has been an increase in the maximum adverse reduced static pressure gradient. The maximum gradient, however, is not a monotonically increasing function of the Wrap Factor. This is to be expected since the same value of Wrap Factor can be obtained through an infinitely many specifications of rVe along the hub and shroud. This suggests that there are ways to increase the Wrap Factor by keeping the increase in adverse pressure gradient to a minimum. The computed results indicate that an increase in wake number is associated with an increase in Wrap Factor. The results in Ref. 1 show that for an optimal value of wake number, the rVo distribution along the hub should be similar to that along the shroud, i.e., the spanwise of gradient of rVo should be minimized. However, as the distance along the hub is longer than that along the shroud, a different rVe distribution along the shroud should be specified in order to to increase the Wrap Factor. Thus it appears that some trade-offs between the aerodynamic and structural considerations may not be avoided. 6.9 Viscous Code Analysis So far all the results presented have been made under the assumption that the flow through the turbine wheel is both homenthalpic and homentropic. In this section the flow through the resulting blade passage from the inverse design calculation will be analyzed using a viscous code to assess the aerodynamic goodness of the design. The main and splitter blade shape from case j will be taken as representative since it has a finite thickness distribution and hence the computed flow field is expected to give a good approximation to the real flow in a real turbine. 6.9.1 Description of the Code

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