Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner

Research output: ResearchPh.D. thesis

Standard

Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner. / Yang, Yang.

Department of Energy Technology, Aalborg University, 2012. 174 p.

Research output: ResearchPh.D. thesis

Harvard

Yang, Y 2012, Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner. Department of Energy Technology, Aalborg University.

APA

Yang, Y. (2012). Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner. Department of Energy Technology, Aalborg University.

CBE

Yang Y 2012. Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner. Department of Energy Technology, Aalborg University. 174 p.

MLA

Yang, Yang Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner Department of Energy Technology, Aalborg University. 2012.

Vancouver

Yang Y. Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner. Department of Energy Technology, Aalborg University, 2012. 174 p.

Author

Yang, Yang. / Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner. Department of Energy Technology, Aalborg University, 2012. 174 p.

Bibtex

@phdthesis{092c5eb153954b6f9587c4880f2f5b44,
title = "Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner",
abstract = "This thesis represents the research on swirling flow using large eddy simulation(LES). Three cases from the Sydney swirl burner database have been chosen as test cases; one medium swirl isothermal case N29S054, one high swirl isothermal case N16S159 and one medium swirl reacting case SM1.The theories of LES and the corresponding closure models have been welldeveloped. This research focuses on statistical analysing flow field and characteristic features. Validation studies show good agreement in the isothermal cases, while for the reacting case, the LES predictions are less satisfactory.There are two reverse flow zones presented in the medium isothermal case: the upstream one is induced by the bluff‐body, the downstream one is formed by bubble type vortex breakdown. The precessing vortex core is divided into several branches. In the high isothermal case, there is only one long recirculation zone which starts at the burner surface. As for the medium swirling isothermal case, there are two reverse flow zones in the reacting case. Due to the low stoichiometric mixture fraction in the methane flame, only the outer layer of the bluff‐body induced reverse zone is reactive. The main reactive zone is held at the bubblerecirculation.By using two‐dimensional proper orthogonal decomposition (POD) on the cross‐plane, the periodic oscillating movement of the jet has been interpretation.Through this research, a practical guideline is provided for the industry LES user.Nevertheless, the LES method strategy has limitations concerning wall boundedflows, especially for complex geometries typically found in industry. Multi‐phaseflows need special treatment.",
author = "Yang Yang",
year = "2012",
publisher = "Department of Energy Technology, Aalborg University",

}

RIS

TY - BOOK

T1 - Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner

AU - Yang,Yang

PY - 2012

Y1 - 2012

N2 - This thesis represents the research on swirling flow using large eddy simulation(LES). Three cases from the Sydney swirl burner database have been chosen as test cases; one medium swirl isothermal case N29S054, one high swirl isothermal case N16S159 and one medium swirl reacting case SM1.The theories of LES and the corresponding closure models have been welldeveloped. This research focuses on statistical analysing flow field and characteristic features. Validation studies show good agreement in the isothermal cases, while for the reacting case, the LES predictions are less satisfactory.There are two reverse flow zones presented in the medium isothermal case: the upstream one is induced by the bluff‐body, the downstream one is formed by bubble type vortex breakdown. The precessing vortex core is divided into several branches. In the high isothermal case, there is only one long recirculation zone which starts at the burner surface. As for the medium swirling isothermal case, there are two reverse flow zones in the reacting case. Due to the low stoichiometric mixture fraction in the methane flame, only the outer layer of the bluff‐body induced reverse zone is reactive. The main reactive zone is held at the bubblerecirculation.By using two‐dimensional proper orthogonal decomposition (POD) on the cross‐plane, the periodic oscillating movement of the jet has been interpretation.Through this research, a practical guideline is provided for the industry LES user.Nevertheless, the LES method strategy has limitations concerning wall boundedflows, especially for complex geometries typically found in industry. Multi‐phaseflows need special treatment.

AB - This thesis represents the research on swirling flow using large eddy simulation(LES). Three cases from the Sydney swirl burner database have been chosen as test cases; one medium swirl isothermal case N29S054, one high swirl isothermal case N16S159 and one medium swirl reacting case SM1.The theories of LES and the corresponding closure models have been welldeveloped. This research focuses on statistical analysing flow field and characteristic features. Validation studies show good agreement in the isothermal cases, while for the reacting case, the LES predictions are less satisfactory.There are two reverse flow zones presented in the medium isothermal case: the upstream one is induced by the bluff‐body, the downstream one is formed by bubble type vortex breakdown. The precessing vortex core is divided into several branches. In the high isothermal case, there is only one long recirculation zone which starts at the burner surface. As for the medium swirling isothermal case, there are two reverse flow zones in the reacting case. Due to the low stoichiometric mixture fraction in the methane flame, only the outer layer of the bluff‐body induced reverse zone is reactive. The main reactive zone is held at the bubblerecirculation.By using two‐dimensional proper orthogonal decomposition (POD) on the cross‐plane, the periodic oscillating movement of the jet has been interpretation.Through this research, a practical guideline is provided for the industry LES user.Nevertheless, the LES method strategy has limitations concerning wall boundedflows, especially for complex geometries typically found in industry. Multi‐phaseflows need special treatment.

M3 - Ph.D. thesis

BT - Large Eddy Simulation of Flow Structures in the Sydney Swirl Burner

PB - Department of Energy Technology, Aalborg University

ER -

ID: 70020225