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Volute Exit Static Pressure (pa) Volute Exit Flow Angle (deg.) Volute Exit Mach Number 240000 220000 200000 180000 160000 -180 (r-Rh)/(Rs-Rh) 1.00 (Shroud) 0.50 (Mid) 0.00 (Hub) -120 86 85 84 83 82 81 80 79 78 77 (r-Rh)/(Rs-Rh)=0.50 Tongue Position -120 -60 0.85 0.80 0.75 0.70 0.65 0.60 -180 (r-Rh)/(Rs-Rh)=0.50 Tongue Position -120 -60 0 Tongue -60 0 60 120 180 -180 0 60 120 180 60 120 180 Azimuth Angle (deg.) Azimuth Angle (deg.) Azimuth Angle (deg.) M Abidat, M K Hamidou, M Hachemi And M Hamel a – Static Pressure Figures 12: Turbine exit flow parameters at turbine design inlet flow conditions 3.5 3.0 2.5 2.0 1.5 1.0 Volute Inlet Total Pressure (bar) 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 b – Flow Angle c – Mach Number 4.3 Volute performance characteristics The mixed flow turbine has been designed at the conditions given in table1. However, the temperatures and rotational speeds at which the experimental tests were conducted were much lower than those encountered in real applications. The utilization of air at a low temperature enables conventional instrumentation to be used and therefore limits the rig equipment costs. The following volute boundary conditions for all the numerical tests were used: • Total pressure and total temperature (340 K) at the volute inlet. • Averaged static pressure at the volute exit. The static pressure was determined by assuming a 0.5 turbine dynamic degree of reaction and atmospheric pressure condition at the turbine outlet. Figure 13 shows the mass flow rate characteristic, volute total pressure loss coefficient and averaged volute exit flow angle variations along the working range conditions. Reduced Mass Flow Rate Figure 13: Mass flow characteristicPDF Image | ANALYSIS OF RADIAL AND MIXED FLOW TURBINE VOLUTES
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