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Title: Assessment of model assumptions and budget terms of the unsteady flamelet equations for a turbulent reacting jet-in-cross-flow

Abstract

An a priori analysis of the flamelet model for diffusion flames is conducted to systematically assess model assumptions that are associated with the asymptotic expansion, the omission of higher-order expansion terms, the consideration of preferential diffusion effects, and the one-dimensional flamelet representation. For this, a recent direct numerical simulation database of a reacting hydrogen/air jet-in-cross-flow (JICF) by Grout et al. [15,16] is used. The full flamelet equation for temperature, exact to the order of the Eulerian transport equation and general to different definitions of the mixture fraction, is derived. Analysis of mixture fraction conditioned profiles of temperature and scalar dissipation rate along the jet trajectory identified different ignition and flame stabilization scenarios on the windward and leeward sides of the reacting JICF. A balance analysis of the temperature flamelet equation is conducted to quantify contributions in flame-aligned and flame-orthogonal directions. Consistent with the flamelet assumption, it is shown that terms arising from scalar diffusion, heat-release, and species-diffusion-induced enthalpy flux are the dominant contributions, while the flame-aligned preferential diffusion promotes entrainment of heat into the flamelet structure. Finally, for the current JICF-configuration, it is found that contributions along the flame-orthogonal direction are on average negligible.

Authors:
 [1];  [2];  [2];  [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Aerospace Engineering
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Stanford Univ., CA (United States). Dept. of Mechanical Engineering
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lockheed Martin Corporation, Littleton, CO (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1565288
Grant/Contract Number:  
AC04-94AL85000; AC05-00OR22725; FE0007060
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 161; Journal Issue: 10; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Thermodynamics; Energy & Fuels; Engineering; Flamelet modeling; Diffusion flame; Budget-analysis; Jet-in-cross-flow; Direct numerical simulation

Citation Formats

Chan, Wai Lee, Kolla, Hemanth, Chen, Jacqueline H., and Ihme, Matthias. Assessment of model assumptions and budget terms of the unsteady flamelet equations for a turbulent reacting jet-in-cross-flow. United States: N. p., 2014. Web. doi:10.1016/j.combustflame.2014.04.007.
Chan, Wai Lee, Kolla, Hemanth, Chen, Jacqueline H., & Ihme, Matthias. Assessment of model assumptions and budget terms of the unsteady flamelet equations for a turbulent reacting jet-in-cross-flow. United States. https://doi.org/10.1016/j.combustflame.2014.04.007
Chan, Wai Lee, Kolla, Hemanth, Chen, Jacqueline H., and Ihme, Matthias. 2014. "Assessment of model assumptions and budget terms of the unsteady flamelet equations for a turbulent reacting jet-in-cross-flow". United States. https://doi.org/10.1016/j.combustflame.2014.04.007. https://www.osti.gov/servlets/purl/1565288.
@article{osti_1565288,
title = {Assessment of model assumptions and budget terms of the unsteady flamelet equations for a turbulent reacting jet-in-cross-flow},
author = {Chan, Wai Lee and Kolla, Hemanth and Chen, Jacqueline H. and Ihme, Matthias},
abstractNote = {An a priori analysis of the flamelet model for diffusion flames is conducted to systematically assess model assumptions that are associated with the asymptotic expansion, the omission of higher-order expansion terms, the consideration of preferential diffusion effects, and the one-dimensional flamelet representation. For this, a recent direct numerical simulation database of a reacting hydrogen/air jet-in-cross-flow (JICF) by Grout et al. [15,16] is used. The full flamelet equation for temperature, exact to the order of the Eulerian transport equation and general to different definitions of the mixture fraction, is derived. Analysis of mixture fraction conditioned profiles of temperature and scalar dissipation rate along the jet trajectory identified different ignition and flame stabilization scenarios on the windward and leeward sides of the reacting JICF. A balance analysis of the temperature flamelet equation is conducted to quantify contributions in flame-aligned and flame-orthogonal directions. Consistent with the flamelet assumption, it is shown that terms arising from scalar diffusion, heat-release, and species-diffusion-induced enthalpy flux are the dominant contributions, while the flame-aligned preferential diffusion promotes entrainment of heat into the flamelet structure. Finally, for the current JICF-configuration, it is found that contributions along the flame-orthogonal direction are on average negligible.},
doi = {10.1016/j.combustflame.2014.04.007},
url = {https://www.osti.gov/biblio/1565288}, journal = {Combustion and Flame},
issn = {0010-2180},
number = 10,
volume = 161,
place = {United States},
year = {Mon May 05 00:00:00 EDT 2014},
month = {Mon May 05 00:00:00 EDT 2014}
}

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Cited by: 29 works
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Works referenced in this record:

Local Quenching Due to Flame Stretch and Non-Premixed Turbulent Combustion
journal, January 1983


Laminar diffusion flamelet models in non-premixed turbulent combustion
journal, January 1984


Influence of curvature on the onset of autoignition in a corrugated counterflow mixing field☆
journal, July 2005


A consistent flamelet formulation for a reacting char particle considering curvature effects
journal, November 2013


A two mixture fraction flamelet model applied to split injections in a DI Diesel engine
journal, January 2005


Flamelet-based modeling of auto-ignition with thermal inhomogeneities for application to HCCI engines
journal, January 2007


LES flamelet modeling of a three-stream MILD combustor: Analysis of flame sensitivity to scalar inflow conditions
journal, January 2011


A flamelet model for premixed combustion under variable pressure conditions
journal, January 2013


An unsteady laminar flamelet model for non-premixed combustion
journal, March 2000


Direct numerical simulation of flame stabilization downstream of a transverse fuel jet in cross-flow
journal, January 2011


Vortical structure in the wake of a transverse jet
journal, November 1994


An updated comprehensive kinetic model of hydrogen combustion
journal, January 2004


On reduced mechanisms for methaneair combustion in nonpremixed flames
journal, May 1990


Quantification of differential diffusion in nonpremixed systems
journal, May 2005


Terascale direct numerical simulations of turbulent combustion using S3D
journal, January 2009


On the relation between the conditional moment closure and unsteady flamelets
journal, September 2001


Extinction and reignition in a diffusion flame: a direct numerical simulation study
journal, January 1999


Effects of unsteady strain rate on scalar dissipation structures in turbulent planar jets
journal, December 2005


Extinction of diffusion flames with nonunity Lewis numbers
journal, January 1997


Influence of Differential Diffusion on Super-Equilibrium Temperature in Turbulent Non-Premixed Hydrogen/Air Flames
journal, January 2005


Works referencing / citing this record:

Survey of Turbulent Combustion Models for Large-Eddy Simulations of Propulsive Flowfields
conference, January 2015