2006
DOI: 10.1063/1.2354544
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Effects of tip-gap size on the tip-leakage flow in a turbomachinery cascade

Abstract: The effects of tip-gap size on the tip-leakage vortical structures and velocity and pressure fields are investigated using large-eddy simulation, with the objective of providing guidelines for controlling tip-leakage cavitation and viscous losses associated with the tip-leakage flow. The effects of tip-gap size on the generation and evolution of the end-wall vortical structures are discussed by investigating their evolutionary trajectories and the mean velocity field. The tip-leakage jet and tip-leakage vortex… Show more

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Cited by 114 publications
(48 citation statements)
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“…On the numerical side, studies have been done with Reynolds averaged Navier-Stokes simulations, as well as with large eddy simulations. 14,15 Many similarities between the two-vortex configuration (wing-tip vortices) and the one-vortex configuration (tip-leakage vortex) have been observed in previous studies. 8,10,16 These similarities were found to be a useful tool for modeling the flow around the blades in a compressor and the loading they experienced.…”
Section: Introductionsupporting
confidence: 57%
“…On the numerical side, studies have been done with Reynolds averaged Navier-Stokes simulations, as well as with large eddy simulations. 14,15 Many similarities between the two-vortex configuration (wing-tip vortices) and the one-vortex configuration (tip-leakage vortex) have been observed in previous studies. 8,10,16 These similarities were found to be a useful tool for modeling the flow around the blades in a compressor and the loading they experienced.…”
Section: Introductionsupporting
confidence: 57%
“…Thence, the large-eddy simulation provides the most promising and feasible alternative to conventional numerical methods. You et al (2006) investigated the effect of tip-gap size on the tip-leakage vortical structures and velocity and pressure fields using LES computation. Simultaneously, the mechanisms for viscous losses in a turbomachinery tip-leakage flow was revealed by You et al (2007).…”
mentioning
confidence: 99%
“…The smaller the gap, the more intense is the vortex, which eventually gets fade because of the change in leakage flow velocity. This turbulent vortex is formed due to flow rolling during interaction of leakage flow with primary flow, while detaching from guide vane tip [13]. The leading edge downstream is found to have fade turbulence since the leakage induced turbulence vortex is largely dependent on the thickness of the guide vane [14].…”
Section: Nature Of Leakage Flowmentioning
confidence: 99%