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Title: Multidimensional Numerical Simulations of Knocking Combustion in a Cooperative Fuel Research Engine

Abstract

A numerical approach was developed based on multidimensional computational fluid dynamics (CFD) to predict knocking combustion in a cooperative fuel research (CFR) engine. G-equation model was employed to track the turbulent flame front and a multizone model was used to capture auto-ignition in the end-gas. Furthermore, a novel methodology was developed wherein a lookup table generated from a chemical kinetic mechanism could be employed to provide laminar flame speed as an input to the Gequation model, instead of using empirical correlations. To account for fuel chemistry effects accurately and lower the computational cost, a compact 121-species primary reference fuel (PRF) skeletal mechanism was developed from a detailed gasoline surrogate mechanism using the directed relation graph (DRG) assisted sensitivity analysis (DRGASA) reduction technique. Extensive validation of the skeletal mechanism was performed against experimental data available from the literature on both homogeneous ignition delay and laminar flame speed. The skeletal mechanism was used to generate lookup tables for laminar flame speed as a function of pressure, temperature, and equivalence ratio. The numerical model incorporating the skeletal mechanism was employed to perform simulations under research octane number (RON) and motor octane number (MON) conditions for two different PRFs. Parametric tests were conducted atmore » different compression ratios (CR) and the predicted values of critical CR, delineating the boundary between “no knock” and “knock,” were found to be in good agreement with available experimental data. The virtual CFR engine model was, therefore, demonstrated to be capable of adequately capturing the sensitivity of knock propensity to fuel chemistry.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Energy Systems Division,Argonne National Laboratory,9700 S Cass Avenue,Lemont, IL 60439e-mail: pal@anl.gov
  2. Department of Mechanical Engineering,University of Connecticut,Storrs, CT 06269e-mail: yunchao.wu@uconn.edu
  3. Department of Mechanical Engineering,University of Connecticut,Storrs, CT 06269e-mail: tianfeng.lu@uconn.edu
  4. Energy Systems Division,Argonne National Laboratory,9700 S Cass Avenue,Lemont, IL 60439e-mail: ssom@anl.gov
  5. Convergent Science Inc.,6400 Enterprise Lane,Madison, WI 53719e-mail: yeechee.see@convergecfd.com
  6. Convergent Science Inc.,6400 Enterprise Lane,Madison, WI 53719e-mail: alexandraloiero@gmail.com
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1463679
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Energy Resources Technology
Additional Journal Information:
Journal Volume: 140; Journal Issue: 10; Journal ID: ISSN 0195-0738
Publisher:
ASME
Country of Publication:
United States
Language:
English
Subject:
knock; CFD; CFR engine; G-equation; reduced kinetics; spark ignition

Citation Formats

Pal, Pinaki, Wu, Yunchao, Lu, Tianfeng, Som, Sibendu, See, Yee Chee, and Le Moine, Alexandra. Multidimensional Numerical Simulations of Knocking Combustion in a Cooperative Fuel Research Engine. United States: N. p., 2018. Web. doi:10.1115/1.4040063.
Pal, Pinaki, Wu, Yunchao, Lu, Tianfeng, Som, Sibendu, See, Yee Chee, & Le Moine, Alexandra. Multidimensional Numerical Simulations of Knocking Combustion in a Cooperative Fuel Research Engine. United States. https://doi.org/10.1115/1.4040063
Pal, Pinaki, Wu, Yunchao, Lu, Tianfeng, Som, Sibendu, See, Yee Chee, and Le Moine, Alexandra. Tue . "Multidimensional Numerical Simulations of Knocking Combustion in a Cooperative Fuel Research Engine". United States. https://doi.org/10.1115/1.4040063.
@article{osti_1463679,
title = {Multidimensional Numerical Simulations of Knocking Combustion in a Cooperative Fuel Research Engine},
author = {Pal, Pinaki and Wu, Yunchao and Lu, Tianfeng and Som, Sibendu and See, Yee Chee and Le Moine, Alexandra},
abstractNote = {A numerical approach was developed based on multidimensional computational fluid dynamics (CFD) to predict knocking combustion in a cooperative fuel research (CFR) engine. G-equation model was employed to track the turbulent flame front and a multizone model was used to capture auto-ignition in the end-gas. Furthermore, a novel methodology was developed wherein a lookup table generated from a chemical kinetic mechanism could be employed to provide laminar flame speed as an input to the Gequation model, instead of using empirical correlations. To account for fuel chemistry effects accurately and lower the computational cost, a compact 121-species primary reference fuel (PRF) skeletal mechanism was developed from a detailed gasoline surrogate mechanism using the directed relation graph (DRG) assisted sensitivity analysis (DRGASA) reduction technique. Extensive validation of the skeletal mechanism was performed against experimental data available from the literature on both homogeneous ignition delay and laminar flame speed. The skeletal mechanism was used to generate lookup tables for laminar flame speed as a function of pressure, temperature, and equivalence ratio. The numerical model incorporating the skeletal mechanism was employed to perform simulations under research octane number (RON) and motor octane number (MON) conditions for two different PRFs. Parametric tests were conducted at different compression ratios (CR) and the predicted values of critical CR, delineating the boundary between “no knock” and “knock,” were found to be in good agreement with available experimental data. The virtual CFR engine model was, therefore, demonstrated to be capable of adequately capturing the sensitivity of knock propensity to fuel chemistry.},
doi = {10.1115/1.4040063},
url = {https://www.osti.gov/biblio/1463679}, journal = {Journal of Energy Resources Technology},
issn = {0195-0738},
number = 10,
volume = 140,
place = {United States},
year = {2018},
month = {5}
}

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