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Title: Direct Numerical Simulations of Autoignition in Stratified Dimethyl-ether (DME)/Air Turbulent Mixtures

Abstract

In our paper, two- and three-dimensional direct numerical simulations (DNS) of autoignition phenomena in stratified dimethyl-ether (DME)/air turbulent mixtures are performed. A reduced DME oxidation mechanism, which was obtained using rigorous mathematical reduction and stiffness removal procedure from a detailed DME mechanism with 55 species, is used in the present DNS. The reduced DME mechanism consists of 30 chemical species. This study investigates the fundamental aspects of turbulence-mixing-autoignition interaction occurring in homogeneous charge compression ignition (HCCI) engine environments. A homogeneous isotropic turbulence spectrum is used to initialize the velocity field in the domain. Moreover, the computational configuration corresponds to a constant volume combustion vessel with inert mass source terms added to the governing equations to mimic the pressure rise due to piston motion, as present in practical engines. DME autoignition is found to be a complex three-staged process; each stage corresponds to a distinct chemical kinetic pathway. The distinct role of turbulence and reaction in generating scalar gradients and hence promoting molecular transport processes are investigated. Then, by applying numerical diagnostic techniques, the different heat release modes present in the igniting mixture are identified. In particular, the contribution of homogeneous autoignition, spontaneous ignition front propagation, and premixed deflagration towards themore » total heat release are quantified.« less

Authors:
 [1];  [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Energy Frontier Research Centers (EFRC) (United States). Combustion Energy Frontier Research Center (CEFRC); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1183095
Alternate Identifier(s):
OSTI ID: 1246710
Report Number(s):
SAND2014-16953J
Journal ID: ISSN 0010-2180; 536909
Grant/Contract Number:  
AC04-94AL85000; SC0001198; AC04-94-AL85000; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 162; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; low temperature combustion engines; thermal and compositional stratification; autoignition; direct numerical simulation

Citation Formats

Bansal, Gaurav, Mascarenhas, Ajith, and Chen, Jacqueline H. Direct Numerical Simulations of Autoignition in Stratified Dimethyl-ether (DME)/Air Turbulent Mixtures. United States: N. p., 2014. Web. doi:10.1016/j.combustflame.2014.08.021.
Bansal, Gaurav, Mascarenhas, Ajith, & Chen, Jacqueline H. Direct Numerical Simulations of Autoignition in Stratified Dimethyl-ether (DME)/Air Turbulent Mixtures. United States. https://doi.org/10.1016/j.combustflame.2014.08.021
Bansal, Gaurav, Mascarenhas, Ajith, and Chen, Jacqueline H. Wed . "Direct Numerical Simulations of Autoignition in Stratified Dimethyl-ether (DME)/Air Turbulent Mixtures". United States. https://doi.org/10.1016/j.combustflame.2014.08.021. https://www.osti.gov/servlets/purl/1183095.
@article{osti_1183095,
title = {Direct Numerical Simulations of Autoignition in Stratified Dimethyl-ether (DME)/Air Turbulent Mixtures},
author = {Bansal, Gaurav and Mascarenhas, Ajith and Chen, Jacqueline H.},
abstractNote = {In our paper, two- and three-dimensional direct numerical simulations (DNS) of autoignition phenomena in stratified dimethyl-ether (DME)/air turbulent mixtures are performed. A reduced DME oxidation mechanism, which was obtained using rigorous mathematical reduction and stiffness removal procedure from a detailed DME mechanism with 55 species, is used in the present DNS. The reduced DME mechanism consists of 30 chemical species. This study investigates the fundamental aspects of turbulence-mixing-autoignition interaction occurring in homogeneous charge compression ignition (HCCI) engine environments. A homogeneous isotropic turbulence spectrum is used to initialize the velocity field in the domain. Moreover, the computational configuration corresponds to a constant volume combustion vessel with inert mass source terms added to the governing equations to mimic the pressure rise due to piston motion, as present in practical engines. DME autoignition is found to be a complex three-staged process; each stage corresponds to a distinct chemical kinetic pathway. The distinct role of turbulence and reaction in generating scalar gradients and hence promoting molecular transport processes are investigated. Then, by applying numerical diagnostic techniques, the different heat release modes present in the igniting mixture are identified. In particular, the contribution of homogeneous autoignition, spontaneous ignition front propagation, and premixed deflagration towards the total heat release are quantified.},
doi = {10.1016/j.combustflame.2014.08.021},
journal = {Combustion and Flame},
number = ,
volume = 162,
place = {United States},
year = {Wed Oct 01 00:00:00 EDT 2014},
month = {Wed Oct 01 00:00:00 EDT 2014}
}

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Cited by: 48 works
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Works referencing / citing this record:

Direct Numerical Simulations of Hotspot-induced Ignition in Homogeneous Hydrogen-air Pre-mixtures and Ignition Spot Tracking
journal, January 2018

  • Chi, Cheng; Abdelsamie, Abouelmagd; Thévenin, Dominique
  • Flow, Turbulence and Combustion, Vol. 101, Issue 1
  • DOI: 10.1007/s10494-017-9883-1

Direct Numerical Simulations of Hotspot-induced Ignition in Homogeneous Hydrogen-air Pre-mixtures and Ignition Spot Tracking
journal, January 2018

  • Chi, Cheng; Abdelsamie, Abouelmagd; Thévenin, Dominique
  • Flow, Turbulence and Combustion, Vol. 101, Issue 1
  • DOI: 10.1007/s10494-017-9883-1