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M Abidat, M K Hamidou, M Hachemi And M Hamel 4 RESULTS AND DISCUSION The numerical method described in this paper has been applied to a radial inflow turbine volute [8] for which experimental data is available. It was then used to study the volute casing of a mixed flow turbine. 4.1 – Grid solution dependency For both volutes, the grid influence on the solution was studied. For each case, three mesh sizes have been used to compute the turbulent flow solution in the turbine volute in order to choose the optimal grid for the final computation. The solutions obtained with the three grids are presented in figures 04 in terms of static pressure distribution along the mean streamline which starts from the volute inlet centre. The grids II with 395523 and 248293 elements for the radial inflow turbine volute [8] and the mixed flow turbine volute respectively were found to give a satisfactory solution and were used for the numerical tests. 1800 1600 1400 1200 1000 800 600 400 200 0 Number of Elements 269595 (Grid I) 395233 (Grid II) 787423 (Grid III) Mean stream line pressure distribution: Grid solution independency 109000 108500 108000 107500 107000 106500 106000 Inlet Total Pressure = 1,239 (bar) Mass Flow Rate = 0.1822 (kg s^-1) Inlet Total Temperature = 340 (K) Grid Size 153832 (Grid I) 248293 (Grid II) 799867 (Grid III) 0.070 0.075 0.080 0.06 0.08 0.10 0.12 Radius (m) 0.14 0.16 0.045 0.050 0.055 0.060 0.065 0.085 a) Radial Inflow turbine volute Figure 04: Grid solution independency Vr / Vr Relative Static Pressure (Pa) Static Pressure (Pa) Figure 05 : Radial Inflow turbine volute Figure 06: Volute outlet axial distribution of radial velocity 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 Volute outlet axial distribution of radial velocity Hub 0.0 0.2 0.4 1.5 1.9 2.8 3.7 0.6 Shroud 0.8 1.0 CFX Exp[8] bs/be z/be Rradial distance (m) b) Mixed flow turbine volutePDF Image | ANALYSIS OF RADIAL AND MIXED FLOW TURBINE VOLUTES
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