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07 : Figure 08: Volute mean outlet flow angle M Abidat, M K Hamidou, M Hachemi And M Hamel The radial turbine volute, shown in figure 05, for which experimental data is available is used to test the numerical model when it is applied to such complicated component geometry. The geometrical characteristics and experimental test conditions are given in detail by Hra et al [8]. The numerical results are compared with the experimental ones in figures 06, 07 and 08. Figure 06 shows the circumferential averaged radial velocity distribution from hub to shroud for the four geometrical configurations. A reasonable agreement between numerical and experimental results is obtained for large cross section area volutes. Figures 07 and 08 show a comparison between measured and computed total pressure loss coefficient and average volute exit flow angle respectively. 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 Figure coefficient 20 18 16 14 12 10 8 6 Volute mean outlet flow angle Total pressure loss cofficient Averaged Volute Exit Flow Angle (deg.) CFX Exp [8] 234 bs/be Volute total pressure loss Exp [8] CFX 1.5 2.0 2.5 3.0 bs/be 3.5 4.0 4.2 Volute flow field analysis at inlet design flow conditions The computational results obtained at the mixed flow turbine design conditions (table 01) are presented in figures 09 to 12. Table1: Design conditions [9] Rotational speed: Mass flow rate: Total inlet temperature: Pressure ration: Optimum velocity ratio: 98000 rpm 0.414kg/s 923 K 2.91 0.61 Figures 09 show the static pressure distribution at four different volute cross sections located at 0, 90, 180 and 270 degrees azimuth angles respectively, wile figure 10 shows the pressure contours in a transversal section situated at an axial distance of 15 mm from the back of the volute. The pressure contours are more or less concentric with the outlet circle. A non uniformity is however observed near the tongue. This perturbation of the flow uniformity is propagated up to the volute outlet as illustrated in figures 11 which show the angular distribution of the static pressure, the absolute flow angle and the Mach number at differentPDF Image | ANALYSIS OF RADIAL AND MIXED FLOW TURBINE VOLUTES
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