An innovative analysis based on second-moment closure (SMC), incorporating proper modelling of low-Re-number and wall proximity effects is adopted in conjunction with numerical model based on an in-house parallel finite element code for the prediction of a 3D linear compressor cascade How with tip clearance. The strong interaction between the lip leakage vortex, the mainstream, the passage vortex and the other turbulent structures causes important portion of energy losses and it influences the overall performance of the compressors. A systematic comparison of the prediction of the proposed SMC with respect to a linear eddy viscosity closure (standard k-ε) and experiments is carried out. In the tip leakage the turbulent flow is characterized by an high level of anisotropy induced by complex shear effects. The present predictions demonstrates that second moment closures feature a superior capability to reproduce all major phenomenological features and mean flow parameters of turbomachinery flows. Copyright © 2006 by ASME.

Prediction of tip-leakage flows in axial flow compressor with Second Moment Closures / Borello, Domenico; Rispoli, Franco; K., Hanjalic. - ELETTRONICO. - 1:(2006), pp. 1-10. (Intervento presentato al convegno ASME Turbo Expo 2006 tenutosi a Barcelona; Spain nel 8-11 May 2006) [10.1115/GT2006-90535].

Prediction of tip-leakage flows in axial flow compressor with Second Moment Closures

BORELLO, Domenico;RISPOLI, Franco;
2006

Abstract

An innovative analysis based on second-moment closure (SMC), incorporating proper modelling of low-Re-number and wall proximity effects is adopted in conjunction with numerical model based on an in-house parallel finite element code for the prediction of a 3D linear compressor cascade How with tip clearance. The strong interaction between the lip leakage vortex, the mainstream, the passage vortex and the other turbulent structures causes important portion of energy losses and it influences the overall performance of the compressors. A systematic comparison of the prediction of the proposed SMC with respect to a linear eddy viscosity closure (standard k-ε) and experiments is carried out. In the tip leakage the turbulent flow is characterized by an high level of anisotropy induced by complex shear effects. The present predictions demonstrates that second moment closures feature a superior capability to reproduce all major phenomenological features and mean flow parameters of turbomachinery flows. Copyright © 2006 by ASME.
2006
ASME Turbo Expo 2006
Compressor cascade; Eddy viscosity closure; Second-moment closure (SMC)
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Prediction of tip-leakage flows in axial flow compressor with Second Moment Closures / Borello, Domenico; Rispoli, Franco; K., Hanjalic. - ELETTRONICO. - 1:(2006), pp. 1-10. (Intervento presentato al convegno ASME Turbo Expo 2006 tenutosi a Barcelona; Spain nel 8-11 May 2006) [10.1115/GT2006-90535].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/368300
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