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The code used is "BTOB3DSP" program which is developed by W. N. Dawes from Whittle Laboratory. This code is similar to "BTOB3D" except that it has been mod- ified to include splitters. This code uses structured grid and all flow quantities are cell-centered. It solves the Reynolds averaged Navier-Stokes equation with a mixing length turbulence model in a rotating cylindrical coordinate system. The mixing length turbulence model used is that due to Baldwin and Lomax (Ref. 23). The shear stress on the hub and casing is obtained from log law. The code also assumes that the flow is spatially periodic from blade passage to blade passage. The code uses control volume approach in solving the discretized conservation laws. Fluxes through cell faces are found by linear interpolation between cell centers which results in second order formal spatial accuracy on smoothly varying meshes and en- sured global conservation. The code uses an artificial viscosity which consists of an adaptive-combination of a second difference and fourth difference which is blended through shock waves to eliminate wiggles and give sharp shock capture. This adaptive artificial viscosity is used to control odd-even point solution decoupling and to suppress oscillation in regions with strong pressure gradients. The time marching scheme of the code uses Beam-Warming implicit algorithm (Ref. 24) with two step evaluation of the residue analogous to the Brailovskaya scheme (Ref. 25). At the upstream boundary, the values of absolute stagnation pressure and tempera- ture are specified along with the absolute swirl angle and the meridional pitch angle of the incoming flow. The tangential and meridional velocities are used as initial guesses only. At the downstream boundary, the static pressure at the hub is specified and its radial variation is obtained from simple radial equilibrium. The static pressure at the hub is adjusted until the right amount of mass flow is obtained. 6.9.2 Results from the Code The main and splitter blade shapes for the viscous code calculation are shown inPDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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