Tip clearance flow in axial flow impellers at low flow rate.

Inoue, M.; Kuroumaru, M.; Ando, Youichi

doi:10.1299/kikaib.56.1690

Cited by 2 publications

(4 citation statements)

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“…Exploring the unsteady behaviour of tip clearance flow at near-stall conditions has been one research branch. Furukawa et al [1] numerically investigated unsteady behaviours in a low-speed compressor rotor, which tip flowfield had been extensively measured by Inoue et al [2][3][4][5] at design and near-stall conditions. Inoue et al [2][3][4][5] found the interaction between tip leakage flow and incoming flow forced tip leakage flow to roll up into a slender vortex at design point, which could be clearly seen as coiling of secondary vectors near the casing.…”

Section: Introductionmentioning

confidence: 99%

“…Furukawa et al [1] numerically investigated unsteady behaviours in a low-speed compressor rotor, which tip flowfield had been extensively measured by Inoue et al [2][3][4][5] at design and near-stall conditions. Inoue et al [2][3][4][5] found the interaction between tip leakage flow and incoming flow forced tip leakage flow to roll up into a slender vortex at design point, which could be clearly seen as coiling of secondary vectors near the casing. However, the abnormal flow phenomena were observed at nearstall condition: the coiling of secondary vectors near the casing disappeared, while the low-energy fluid was spread out to about 60 per cent of span.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation into the mechanism of spike-type stall inception in an axial compressor rotor

Zhang

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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Whole-passage simulations were conducted to simulate the stall inception process in a subsonic compressor rotor. The predicted results agreed well with available steady-state and time-resolving experimental data. The detailed flowfield analyses further demonstrated that the test rotor was of spike-type stall inception. The self-sustained unsteady cycle of tip separation vortex (TSV) was the underlying flow mechanism for the occurrence of the so-called ‘tip clearance spillage flow’ and ‘tip clearance backflow’. Furthermore, the correlation between the self-sustained cycles of TSV in the preceding and native passages was the flow mechanism for emergence of spike. For the test rotor, the distinctive flowfield feature during the development of spike was the involvement of ‘tip clearance back-spillage flow’.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical investigation into the mechanism of spike-type stall inception in an axial compressor rotor

Zhang

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…As the operating conditions move toward the stall limit, the pressure difference across blade tip section increases; as a result, a strong TLV should be expected. However, some abnormal flow behavior of TLV is observed [6][7][8] if flow field is viewed from steady flow assumptions. Therefore, recent research on tip clearance flow mainly focuses on its unsteadiness and potential linkage with stall inception and blade vibrations.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, recent research on tip clearance flow mainly focuses on its unsteadiness and potential linkage with stall inception and blade vibrations. Furukawa et al 9 conducted single-passage steady Reynolds-averaged Navier-Stokes (RANS) simulations for the same test rig measured by Inoue and coworkers, 1,2,6,7 and a viewpoint of the breakdown of TLV was proposed to explain the abnormal behavior of TLV. In their further single-passage unsteady RANS simulations, Furukawa et al 10 deemed that unsteady behavior near casing is attributable to the spiral-type breakdown of TLV at near stall (NS) conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of flow characteristic of tip leakage flow in an axial flow compressor rotor

Jia

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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Tip leakage flow fields in a small-scale high-speed subsonic axial flow compressor rotor were investigated by virtue of the steady and casing instantaneous pressure measurements over wide stable operating range. Fast Fourier transformation and short time Fourier transformation analyses were conducted to elucidate the flow characteristics at different operating conditions, with an emphasis on extending experimental database to validate the previous and subsequent numerical investigations, which would be crucial to the understanding of the origin of tip flow unsteadiness. The measured quasi-steady flow characteristics agreed well with the flow features of tip leakage flow from previous steady simulations. The unsteady flow characteristic of tip leakage flow was the appearance of rotating instability, which was of varying frequency closely related to tip loading variation. An agreement between the unsteady flow characteristics of tip leakage flow from the current measurements and from the previous unsteady simulations to some extent indicated that further systematical unsteady simulations and a deeper quantitative validation of simulation results should be made so that the origin of rotating instability could be uncovered precisely.

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Tip clearance flow in axial flow impellers at low flow rate.

Cited by 2 publications

References 0 publications

Numerical investigation into the mechanism of spike-type stall inception in an axial compressor rotor

Numerical investigation into the mechanism of spike-type stall inception in an axial compressor rotor

Experimental investigation of flow characteristic of tip leakage flow in an axial flow compressor rotor

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