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Investigation of Flow Structure in a Turbocharger Turbine under Pulsating Flow Conditions
ISSN: 1946-3952, e-ISSN: 1946-3960
Published June 23, 2008 by SAE International in United States
Citation: Chen, L., Zhuge, W., Zhang, Y., Li, Y. et al., "Investigation of Flow Structure in a Turbocharger Turbine under Pulsating Flow Conditions," SAE Int. J. Fuels Lubr. 1(1):1167-1174, 2009, https://doi.org/10.4271/2008-01-1691.
A three-dimensional numerical investigation into aerodynamic feature of the turbocharger turbine under pulsating flow conditions is conducted in this paper. Dual time stepping approach is applied to solve the unsteady Navier-Stokes equations, while the Jameson central scheme is brought in for spatial discretization, and Spalart-Allmaras turbulence model is employed in order to get good viscous resolution, accuracy and computing efficiency. The quasi-steady and unsteady performance of the turbine is given and compared. Five blade passage cross sections are chosen to analyze the structure of the secondary flow at 4 key instants. The developments of different vortex, especially the tip leakage vortex, passage vortex are discussed. The results have shown that the unsteady performance deviates substantially from quasi-steady performance, and the secondary flow structure varies tremendously under the pulsating flow conditions.