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Numerical computations of the unsteady flow in a radial turbine

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Numerical computations of the unsteady flow in a radial turbine ( numerical-computations-unsteady-flow-a-radial-turbine )

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5.2. UNSTEADY FLOW IN A RADIAL TURBINE 43 and the number of cells for each region. In the rotor region, only hexahedron cells have been used, while in the rest of the domain an unstructured grid has been used with 95% hexahedron cells. Table 2. Grid resolution. Volute Wheel Diffuser Complete turbine Number of cells 275 084 297 648 538 988 1 111 720 Averaged cell size (mm) 0.77 0.42 0.71 0.69 The turbine under consideration is a commercially available turbine with a size that is typical for a turbocharger mounted on a 2.0 litre IC engine of a passenger car. The turbine is a nozzle-less, 9 bladed radial turbine with the waste-gate valve closed. The complete turbine and the turbine wheel are shown in Figure 5.6. The leading edge tip radius of the wheel is 22.10 mm and the trailing edge tip radius is 18.75 mm. Figure 5.6. The complete turbine geometry and the wheel. The time-step for the non-pulsatile computations is 10−6 seconds which corresponds to a rotation of the wheel of 0.6◦/iteration. For the pulsatile computations, the time-step is 4 · 10−7 seconds.

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