An intermittency based approach for separated flow transition coupled with a two equation turbulence model has been used to predict low-Reynolds number high-lift cascade flows. The intermittency function is based on the vorticity Reynolds number and on a critical Reynolds number for separated flow transition onset. The intermittency function is allowed to exceed the unity in laminar separation bubbles to enhance turbulence production thus permitting the flow reattachment. The proposed model can be "hosted" by any general intermittency formulation for attached flow, and can be used in conjunction to any turbulence closure. The proposed intermittency formulation has been tested on different cascade configurations in low-Reynolds number conditions. The comparison between computed and experimental results, in terms of blade surface Mach number distributions and losses will be presented and discussed for several Reynolds number values.

Assessment of an Intermittency Based Approach to Separated Flow Transition Predictions in Low-Reynolds Number High-Lift Cascade Flow / R. Pacciani; M. Marconcini; F. Bertini. - STAMPA. - (2009), pp. 141-151. ((Intervento presentato al convegno 8th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2009 tenutosi a Graz, Austria nel 23-27 March.

Assessment of an Intermittency Based Approach to Separated Flow Transition Predictions in Low-Reynolds Number High-Lift Cascade Flow

PACCIANI, ROBERTO;MARCONCINI, MICHELE;
2009

Abstract

An intermittency based approach for separated flow transition coupled with a two equation turbulence model has been used to predict low-Reynolds number high-lift cascade flows. The intermittency function is based on the vorticity Reynolds number and on a critical Reynolds number for separated flow transition onset. The intermittency function is allowed to exceed the unity in laminar separation bubbles to enhance turbulence production thus permitting the flow reattachment. The proposed model can be "hosted" by any general intermittency formulation for attached flow, and can be used in conjunction to any turbulence closure. The proposed intermittency formulation has been tested on different cascade configurations in low-Reynolds number conditions. The comparison between computed and experimental results, in terms of blade surface Mach number distributions and losses will be presented and discussed for several Reynolds number values.
Conference proceedings
8th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2009
Graz, Austria
23-27 March
R. Pacciani; M. Marconcini; F. Bertini
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/355137
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