The tip-clearance flow in axial turbomachines is studied using large-eddy simulation with particular emphasis on understanding the unsteady characteristics of the tip-leakage vortical structures and the underlying mechanisms for cavitation-inducing low-pressure fluctuations. A systematic and detailed analysis of the velocity and pressure fields has been made in a linear cascade with a moving end-wall. The generation and evolution of the tip-leakage vortical structures have been investigated throughout the cascade using mean streamlines and contours. An analysis of the energy spectra and space-time correlations of the velocity fluctuations suggests that the tip-leakage vortex is subject to a pitchwise low frequency wandering motion. Detailed statistics of the pressure fields has been analyzed to draw inferences on cavitation. The regions of low pressure relative to the mean values coincide with regions of strong pressure fluctuations, and the regions are found to be highly correlated with the vortical structures in the tip-leakage flow, particularly in the tip-leakage and tip-separation vortices.
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August 2007
Technical Papers
Vortex Dynamics and Low-Pressure Fluctuations in the Tip-Clearance Flow
Meng Wang,
Meng Wang
Department of Aerospace and Mechanical Engineering,
University of Notre Dame
, Notre Dame, IN 46556
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Parviz Moin,
Parviz Moin
Center for Turbulence Research,
Stanford University
, Stanford, CA 94305
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Rajat Mittal
Rajat Mittal
Department of Mechanical and Aerospace Engineering,
George Washington University
, Washington, DC 20052
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Donghyun You
Meng Wang
Department of Aerospace and Mechanical Engineering,
University of Notre Dame
, Notre Dame, IN 46556
Parviz Moin
Center for Turbulence Research,
Stanford University
, Stanford, CA 94305
Rajat Mittal
Department of Mechanical and Aerospace Engineering,
George Washington University
, Washington, DC 20052J. Fluids Eng. Aug 2007, 129(8): 1002-1014 (13 pages)
Published Online: January 24, 2007
Article history
Received:
May 22, 2006
Revised:
January 24, 2007
Citation
You, D., Wang, M., Moin, P., and Mittal, R. (January 24, 2007). "Vortex Dynamics and Low-Pressure Fluctuations in the Tip-Clearance Flow." ASME. J. Fluids Eng. August 2007; 129(8): 1002–1014. https://doi.org/10.1115/1.2746911
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