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Fig. 6.42a and 6.42b, respectively. The blade thickness is not shown in these 3-D perspectives. The code is run at the design point of the turbine, which is specified in Table I. The Reynolds number based on hub axial chord and exit meridional velocity is computed to be 8.8 x 105. For the viscous calculation the number of grid points from hub to shroud is taken to be 17. The number of grid points from inlet to oulet is taken to be 107. The outlet section has been expanded to ensure that the influence of the blade on the flow field at the downstream boundary is minimum. The meridional mesh is shown in Fig. 6.43. The number of grid points from blade to blade is taken to be 25. However, as the numerical scheme uses 4 cells to represent the splitter blade thickness, there are effectively only 20 computational cells with half of them on each side of the splitter blade. The quasi stream-surface projection of the grid on the hub is shown in Fig. 6.44. The reduced static pressure distributions from the inverse design calculation on the suction surface, pressure surface, hub surface, and shroud surface are shown in Fig 6.45 to Fig. 6.48. This pressure field does not seem to have any strong adverse gradient. However, the numerical solution shows that there appears to be a breakdown in the flow field. The velocity fields along the quasi stream-surface after 400 iterations on the hub, mid-span, and shroud surfaces are shown in Fig. 6.49, 6.50 and 6.51. There is a flow separation from both the suction and pressure surfaces near the trailing edge. The separation occurs earlier near the hub surface than on the mid-span. Near the shroud surface it does not happen. This separation in the flow field causes some difficulty in the code for later iterations. It produces a lot of swirl leaving the trailing edge of the blade which induces backward flow at the outlet. The velocity field near the outlet for quasi stream-surface near the hub and shroud after 4500 iterations are shown in Fig. 6.52 and 6.53. In Fig 6.53 we see that there is an incoming flow at the downstream boundary. Since there is no specification whatsoever on the flow at the downstream boundary except the staticPDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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