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A Detailed Analysis of Radial Turbines

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A Detailed Analysis of Radial Turbines ( a-detailed-analysis-radial-turbines )

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Figure 5.7.: The cascade plot of two nozzle blades of the preliminary design. Finally the volute and diffusor are sized. It is necessary to achieve a smaller radius of the volute than the one of the second turbine to make the whole turbine smaller. This is accomplished with an external volute of elliptical size. The aspect ratio, A/B, is set to 1.15. The preliminary exhaust diffusor uses an area ratio of 1.5 giving a pressure recovery coefficient of 0.518. The mach number drops approximately 40 percent from diffusor inlet to diffusor outlet. The gas used in the design is a mixture attempted to resemble an exhaust gas composition from a diesel engine. The mole fractions are summarized in table 5.5. Table 5.5.: The mole fractions of the gas used. Carbon dioxide, CO2 0.12 Nitrogen, N2 0.55 Oxygen, O2 0.23 Water, H2O 0.10 1-D performance analysis in RIFT The preliminary design produced in the previous subsection is evaluated using the pro- gram ”RIFT” which is a mean-line performance analysis tool. The results are presented as figures, 5.8 and 5.9 showing the stage total-to-total efficiency and the mass flow. To be able to make a qualitative comparison with the second turbine the same corrected speeds are used and no diffusor was incorporated. 59

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