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182 Figure 6-12: Mesh independence study using ANSYS TurboGrid. 6.3.5 Physical Domain and Boundary Conditions Boundary conditions are required at the borders of the control volume to solve the mathematical system. Two models of boundary conditions can be applied in ANSYS CFX. The first model applies total pressure and temperature at the turbine inlet and static pressure at the exit, whereas the second model is defined with the combination of mass flow rate at the inlet and static pressure at the outlet. In this study, the first model was applied because it provides the best numerical stability and convergence rates [288]. To include the effect of heat transfer, the total energy model was included in the simulation because it depicts the transport of enthalpy and considers the flow kinetic energy [279]. All solid surfaces were modelled as smooth walls using a no-slip boundary condition.The simulation was run for the following boundary conditions (design point): Turbine inlet stagnation temperature, 𝑇01 = 471.5 𝐾. Turbine inlet stagnation pressure, 𝑃01 = 900 𝑘𝑃𝑎. Turbine exit static pressure, 𝑃5 = 130 𝑘𝑃𝑎. Turbine shaft speed, 𝑁 = 40,000 𝑟𝑝𝑚 To reduce computational time, a single flow passage for the rotor and stator was simulated and rotational periodicity was applied by setting an appropriate pitch ratio at the interface between the stator and the rotor.PDF Image | Automotive Radial Turbine Expander Design WHR
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