Abstract
The secondary flow within a passage of turbomachinery exhibits a complex flow pattern by the effect of the centrifugal and the Coriolis forces. The passage vortex in this secondary flow generates a major part of the losses. However, the mechanism of the loss generation has not been fully clarified yet. In this point of view, the passage vortex is closely examined by the computational method using the two-dimensional curved square ducts as fundamental models. The inlet boundary layer thickness and the inlet velocity distortion are considered to be the major parameters affecting the generation of passage vortex in the present study. The computed results revealed that the passage vortex gave the predominant effects for the generation of loss not only in the breakdown process but also in the development process.
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References
Taylor, A M K P, Whitelaw, J H, Yianneskis, M. Curved Ducts with Strong Secondary Motion: Velocity Measurements of Developing Laminar and Turbulent Flow. Trans. ASME, J. Fluids Eng., 1982, 104(9): 350–359
Kim, W J, Patel, V C. Origin and Decay of Longitudinal Vortices in Developing Flow in a Curved Rectangular Duct. Trans. ASME, J. Fluids Eng., 1994, 116(3): 45–52
Boyle, M T, Simonds, M, Poon, K. A Comparison of Secondary Flow in a Vane Cascade and a Curved Duct. Trans ASME, J. Turbomachinery, 1989, 111(10): 530–536
Mizuki, S, Tsujita, H. A Simulation of Secondary Flow in Centrifugal Impeller Channel by a Stationary Three-Dimensional Curved Duct. ASME Paper 92-GT-278, 1992
Kim, K, Wiedner, B G, Camci, C. Analysis of Turbulent Flow and Endwall Heat Transfer in a 90°Turning Duct and Comparisons with Measured Data. Proceedings of ISROMAC-8, 2000. II: 643–666
Tsujita, H, Mizuki, S. Numerical Calculation of Incompressible Turbulent Flow within Curved Square Duct. Proceedings of ISTP-IV, 1991. 4: 1558–1569
Tominaga, J, Outa, E, Yamamoto, A. Effects of the Inlet Endwall Boundary Layer on 3-D Flows and Loss Evolution in a Linear Turbine Cascade. ASME Paper 95-GT-188, 1995
Yamamoto, A, Usui, H, Kuruma, T, et al. Loss Generation in an Ultra-Highly Loaded Turbine Cascade Affected by Inlet Boundary Layer Thickness. Proceedings of ISROMAC-8, 2000. I: 335–340
Moore, J, Adhye, R Y. Secondary Flows and Losses Downstream of a Turbine Cascade. Trans. ASME, J. Eng. Power, 1985, 107(10): 961–968
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Tsujita, H., Mizuki, S., Minorikawa, G. et al. Numerical investigation of loss generation mechanisms of flow in turbomachinery by using curved square duct. J. of Therm. Sci. 12, 219–224 (2003). https://doi.org/10.1007/s11630-003-0071-3
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DOI: https://doi.org/10.1007/s11630-003-0071-3