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Large eddy simulation of scalar mixing in jet in a cross-flow

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journal contribution
posted on 23.11.2018, 09:41 by Asela R. Uyanwaththa, Weeratunge MalalasekeraWeeratunge Malalasekera, Graham Hargrave, Mark R. Dubal
Jet in a Cross-Flow (JICF) is a flow arrangement found in many engineering applications, especially in gas turbine air-fuel mixing. Understanding of scalar mixing in JICF is important for low NOx burner design and operation, and numerical simulation techniques can be used to understand both spatial and temporal variation of air-fuel mixing quality in such applications. In this paper mixing of the jet stream with the cross-flow is simulated by approximating the jet flow as a passive scalar and using the Large Eddy Simulation (LES) technique to simulate the turbulent velocity field. A posteriori test is conducted to assess three dynamic Sub-Grid Scale models in modelling jet and cross-flow interaction with the boundary layer flow field. Simulated mean and Reynolds stress component values for velocity field and concentration fields are compared against experimental data to assess the capability of the LES technique, which showed good agreement between numerical and experimental results. Similarly, time mean and RMS values of passive scalar concentration also showed good agreement with experimental data. In addition, LES results are further used to discuss the scalar mixing field in the downstream mixing region.

Funding

We gratefully acknowledge the support provided by EPSRC (UK) and Uniper Technologies Ltd for this project under grant number EPSRC/821044686.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Engineering for Gas Turbines and Power

Citation

UYANWATHTHA, A.R. ... et al., 2018. Large eddy simulation of scalar mixing in jet in a cross-flow. Journal of Engineering for Gas Turbines and Power, 141(6): 061005.

Publisher

American Society of Mechanical Engineers

Version

AM (Accepted Manuscript)

Rights holder

© ASME

Publisher statement

This paper was accepted for publication in the journal Journal of Engineering for Gas Turbines and Power and the definitive published version is available at https://doi.org/10.1115/1.4042089.

Acceptance date

10/11/2018

Publication date

2019-01-09

ISSN

0742-4795

Language

en