Development and Experimental Validation of Large-Eddy Simulation Techniques - Syngas Combustion

 

Large-eddy simulation of a piloted partially-<br/>premixed burner, showing (a) experimental<br/>configuration, (b) comparison of temperature<br/>fields between two operating conditions,<br/>(c) comparison of modeled and experimental<br/>probability density function of scalar field<br/>quantities (mixture fraction and oxidizer<br/>split variables), and (d) comparison of<br/>scalar profiles for carbon dioxide and hydroxyl.
Large-eddy simulation of a piloted partially-
premixed burner, showing (a) experimental
configuration, (b) comparison of temperature
fields between two operating conditions,
(c) comparison of modeled and experimental
probability density function of scalar field
quantities (mixture fraction and oxidizer
split variables), and (d) comparison of
scalar profiles for carbon dioxide and hydroxyl.
Performer: 
Regents of the University of Michigan
Website:  Regents of the University of Michigan
Award Number:  FE0007060
Project Duration:  10/01/2011 – 08/31/2015
Total Award Value:  $570,537.00
DOE Share:  $454,540.00
Performer Share:  $115,997.00
Technology Area:  Hydrogen Turbines
Key Technology:  Hydrogen Turbines
Location:  Ann Arbor, Michigan

Project Description

The scope of this Univesity of Michigan computational effort addresses the development of a fully validated large-eddy simulation (LES)-modeling capability to predict unstable combustion of high hydrogen content (HHC) fuels. To incorporate effects of preferential diffusion, pressure variations, and variations in mixture composition, an unsteady flamelet-based LES combustion model will be extended. The integrated LES-validation effort includes (1) an a priori analysis of critical modeling assumptions using a Direct Numerical Simulation (DNS) database of jet-in-cross-flow configurations, and (2) a posteriori model validation in LES application of a swirl-stabilized gas turbine combustor. The LES-combustion model will be used to develop detailed simulations to characterize facility-induced nonidealities in flow-reactor experiments. Effects arising from high-Reynolds number turbulence transition, mixture stratification, and other mechanisms associated with turbulence/ chemistry interaction on the autoignition behavior will be quantified through parametric calculations. The information gained from these efforts will be used to develop a low-order model that can be utilized for chemical-kinetics investigations and for guiding and improving future flow reactor designs in order to reduce facility effects.

The experimental effort includes high-pressure measurements of HHC fuel combustion in a dual-swirl gas turbine combustor, development of a comprehensive experimental database for LES model validation by considering stable and unstable gas turbine operating conditions, and obtaining improved understanding about fundamental combustion-physical mechanisms that control flame-holding, liftoff, and flashback for HHC fuels. A range of pressures, HHC fuel compositions, and equivalence ratios will be investigated experimentally.

Project Benefits

This project will focus on the development of a computer model that can predict unstable combustion of high hydrogen content (HHC) fuels. Improving large-eddy simulation (LES) models for HHC fuels will lead to hydrogen combustor designs that produce fewer emissions at higher temperatures. Specifically, this project will develop an improved LES model by analyzing critical modeling assumption and validate the model by conducting high pressure measurements of HHC fuel combustion in a dual-swirl gas turbine combustor.

Contact Information

Federal Project Manager 
Mark C Freeman: mark.freeman@netl.doe.gov
Technology Manager 
Richard Dennis: richard.dennis@netl.doe.gov
Principal Investigator 
Matthias Ihme: mihme@umich.edu
 

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