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Large-eddy simulations of gas-turbine swirl injector flow dynamics

Published online by Cambridge University Press:  04 July 2007

SHANWU WANG ,
VIGOR YANG ,
GEORGE HSIAO ,
SHIH-YANG HSIEH  and
HUKAM C. MONGIA
SHANWU WANG
Affiliation:
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA
VIGOR YANG*
Affiliation:
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA
GEORGE HSIAO
Affiliation:
GE Aviation, Cincinnati, OH 45215, USA
SHIH-YANG HSIEH
Affiliation:
GE Aviation, Cincinnati, OH 45215, USA
HUKAM C. MONGIA
Affiliation:
GE Aviation, Cincinnati, OH 45215, USA
*
† Author to whom correspondence should be addressed: vigor@psu.edu.
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Abstract

A comprehensive study on confined swirling flows in an operational gas-turbine injector was performed by means of large-eddy simulations. The formulation was based on the Favre-filtered conservation equations and a modified Smagorinsky treatment of subgrid-scale motions. The model was then numerically solved by means of a preconditioned density-based finite-volume approach. Calculated mean velocities and turbulence properties show good agreement with experimental data obtained from the laser-Doppler velocimetry measurements. Various aspects of the swirling flow development (such as the central recirculating flow, precessing vortex core and Kelvin–Helmholtz instability) were explored in detail. Both co- and counter-rotating configurations were considered, and the effects of swirl direction on flow characteristics were examined. The flow evolution inside the injector is dictated mainly by the air delivered through the primary swirler. The impact of the secondary swirler appears to be limited.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 583 , 25 July 2007 , pp. 99 - 122
Copyright
Copyright © Cambridge University Press 2007

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