TY - JOUR
T1 - Two-dimensional laboratory-scale DNS for knocking experiment using n-heptane at engine-like condition
AU - Morii, Youhi
AU - Dubey, Ajit K.
AU - Nakamura, Hisashi
AU - Maruta, Kaoru
N1 - Funding Information:
We would like to thank Dr. Yuichi Matsuo and Dr. Yasuhiro Mizobuchi of Japanese Aerospace Exploration Agency for the discussion on reactive flow simulations and the AMR method, and Prof. Jin Kusaka of Waseda University for the discussion on engine knock. Numerical simulations were performed on the Supercomputer system ``AFI-NITY'' at the Advanced Fluid Information Research Center, Institute of Fluid Science, Tohoku University. The part of this work was conducted with the support of SIP (Cross-ministerial Strategic Innovation Promotion Program), AICE (Automotive Internal Combustion Engine Technology Research Association), and JSPS KAKENHI Grant Number 19KK0097 .
Funding Information:
We would like to thank Dr. Yuichi Matsuo and Dr. Yasuhiro Mizobuchi of Japanese Aerospace Exploration Agency for the discussion on reactive flow simulations and the AMR method, and Prof. Jin Kusaka of Waseda University for the discussion on engine knock. Numerical simulations were performed on the Supercomputer system ``AFI-NITY'' at the Advanced Fluid Information Research Center, Institute of Fluid Science, Tohoku University. The part of this work was conducted with the support of SIP (Cross-ministerial Strategic Innovation Promotion Program), AICE (Automotive Internal Combustion Engine Technology Research Association), and JSPS KAKENHI Grant Number 19KK0097.
PY - 2021/1
Y1 - 2021/1
N2 - A two-dimensional laboratory-scale DNS of a knocking experiment using a stoichiometric n-C7H16/O2/Ar mixture at engine-like condition with the latest reduced SIP isooctane kinetics was conducted. A compressible reactive flow solver PeleC combined with an in-house efficient chemical kinetics solver MACKS was used. The results of DNS were compared with a “knocking experiment by Kyushu University” conducted in a 14 × 14 × 80 mm rectangular constant volume chamber for the same mixture at an initial temperature of 480 K and pressure of 0.33 MPa. The comparisons showed the present DNS with the latest, validated reduced chemical kinetics successfully reproduced the knock onset timing within an error of 2% as well as the overall features of the experimental observations seen in the Schlieren images such as flame shape transitions, pressure history, and the characteristic faint increase in pressure due to the flame front attachment with the chamber wall. In addition, the present DNS captured that the cool flame ignition occurred homogeneously but accompanied by the rapid formation of density gradients vertical to the side walls in the unburned gas region.
AB - A two-dimensional laboratory-scale DNS of a knocking experiment using a stoichiometric n-C7H16/O2/Ar mixture at engine-like condition with the latest reduced SIP isooctane kinetics was conducted. A compressible reactive flow solver PeleC combined with an in-house efficient chemical kinetics solver MACKS was used. The results of DNS were compared with a “knocking experiment by Kyushu University” conducted in a 14 × 14 × 80 mm rectangular constant volume chamber for the same mixture at an initial temperature of 480 K and pressure of 0.33 MPa. The comparisons showed the present DNS with the latest, validated reduced chemical kinetics successfully reproduced the knock onset timing within an error of 2% as well as the overall features of the experimental observations seen in the Schlieren images such as flame shape transitions, pressure history, and the characteristic faint increase in pressure due to the flame front attachment with the chamber wall. In addition, the present DNS captured that the cool flame ignition occurred homogeneously but accompanied by the rapid formation of density gradients vertical to the side walls in the unburned gas region.
KW - Compressible Navier-Stokes equations
KW - Cool flame ignition
KW - Low-temperature oxidation
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U2 - 10.1016/j.combustflame.2020.10.018
DO - 10.1016/j.combustflame.2020.10.018
M3 - Article
AN - SCOPUS:85092925053
VL - 223
SP - 330
EP - 336
JO - Combustion and Flame
JF - Combustion and Flame
SN - 0010-2180
ER -