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169 model with the CFD by comparing the stagnation and thermodynamic properties at the inlet and exit of the rotor. The results were very accurate with a maximum deviation of 6.3% in the static pressure at rotor inlet. Similarly, Verma et al. [275] validated his 1D model with a complete CFD simulation using ANSYS CFX, and the deviation between the mean-line and CFD simulation in the turbine efficiency was 0.17%. His CFD results showed a choking condition at the design point with Mach number of 1.55. Other studies regarding the application of CFD simulations in ORC radial inflow turbines can be found at [14], [151], [240], [244], [248], [276], [277]. The brief review shows that CFD analysis allows the calculation of the flow field considering the viscous effects which are usually neglected in 1D model. Moreover, CFD can be applied as a reference of validation of mean- line models. This chapter presents the construction of the 3D model of the turbine stage and complete CFD analyses of the constructed 3D components. In order to speed up the simulation, the investigation of flow within the volute is excluded in this chapter since its losses is insignificant compared to those of the rotor and stator. 6.2 Generation of the 3D Model This section presents the construction of the 3D model of the full turbine stage, namely, volute, stator and rotor. 6.2.1 Volute Model The conventional mean-line method that is used to design the volute is explained in Section 5.3.5. The area and radius distributions versus azimuth angle where the volute tongue begins at 0° are shown in Figure 6-1.PDF Image | Automotive Radial Turbine Expander Design WHR
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