Studies on the Effect of In-Cylinder Charge Stratifications on High Load HCCI Combustion

Kei Yoshimura, Shunichi Mori, Kenjiro Nakama, Jin Kusaka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The objective of this article is to clarify the effect of thermal and equivalence ratio stratification on Homogeneous Charge Compression Ignition (HCCI) combustion under several conditions with three-dimensional computational fluid dynamics (3D CFD). Reynolds Averaged Navier-Stokes (RANS) simulation was used to calculate in-cylinder fluid dynamics. The 3D CFD simulation is also coupled with detailed chemical reaction to calculate HCCI combustion. First, the study with a simple engine model reveals that thermal stratification is more effective for prolonged combustion duration, which is a key factor for a high load limit of HCCI combustion, than equivalence ratio stratification. Thermal stratification has two-stage combustion: the combustion propagates from hot region slowly at first and then ignites in the entire in-cylinder region. Owing to this phenomenon, thermal stratification is more effective to mitigate HCCI combustion. Furthermore, thermal stratification enables combustion efficiency to be maintained: combustion efficiency would be a problem to relieve HCCI combustion by intake charge stratification. Second, the study with a detailed engine model was conducted to evaluate the improvement of the high load limit and thermal efficiency under the constraint of the maximum in-cylinder pressure and the pressure rise rate. In the second study, mixture stratification was produced by inducting hot and cold intake mixture from respective intake ports. The result shows that the temperature of in-cylinder hot gas region plays an important role to extend the high load limit of HCCI combustion.

Original languageEnglish
Pages (from-to)2337-2349
Number of pages13
JournalSAE International Journal of Engines
Volume9
Issue number4
DOIs
Publication statusPublished - 2016 Jan 1

Fingerprint

Engine cylinders
Ignition
Thermal stratification
Load limits
Computational fluid dynamics
Engines
Fluid dynamics
Chemical reactions

ASJC Scopus subject areas

  • Automotive Engineering
  • Fuel Technology

Cite this

Studies on the Effect of In-Cylinder Charge Stratifications on High Load HCCI Combustion. / Yoshimura, Kei; Mori, Shunichi; Nakama, Kenjiro; Kusaka, Jin.

In: SAE International Journal of Engines, Vol. 9, No. 4, 01.01.2016, p. 2337-2349.

Research output: Contribution to journalArticle

Yoshimura, Kei ; Mori, Shunichi ; Nakama, Kenjiro ; Kusaka, Jin. / Studies on the Effect of In-Cylinder Charge Stratifications on High Load HCCI Combustion. In: SAE International Journal of Engines. 2016 ; Vol. 9, No. 4. pp. 2337-2349.
@article{999f80cca3844be1a085624e7df9581f,
title = "Studies on the Effect of In-Cylinder Charge Stratifications on High Load HCCI Combustion",
abstract = "The objective of this article is to clarify the effect of thermal and equivalence ratio stratification on Homogeneous Charge Compression Ignition (HCCI) combustion under several conditions with three-dimensional computational fluid dynamics (3D CFD). Reynolds Averaged Navier-Stokes (RANS) simulation was used to calculate in-cylinder fluid dynamics. The 3D CFD simulation is also coupled with detailed chemical reaction to calculate HCCI combustion. First, the study with a simple engine model reveals that thermal stratification is more effective for prolonged combustion duration, which is a key factor for a high load limit of HCCI combustion, than equivalence ratio stratification. Thermal stratification has two-stage combustion: the combustion propagates from hot region slowly at first and then ignites in the entire in-cylinder region. Owing to this phenomenon, thermal stratification is more effective to mitigate HCCI combustion. Furthermore, thermal stratification enables combustion efficiency to be maintained: combustion efficiency would be a problem to relieve HCCI combustion by intake charge stratification. Second, the study with a detailed engine model was conducted to evaluate the improvement of the high load limit and thermal efficiency under the constraint of the maximum in-cylinder pressure and the pressure rise rate. In the second study, mixture stratification was produced by inducting hot and cold intake mixture from respective intake ports. The result shows that the temperature of in-cylinder hot gas region plays an important role to extend the high load limit of HCCI combustion.",
author = "Kei Yoshimura and Shunichi Mori and Kenjiro Nakama and Jin Kusaka",
year = "2016",
month = "1",
day = "1",
doi = "10.4271/2016-32-0010",
language = "English",
volume = "9",
pages = "2337--2349",
journal = "SAE International Journal of Engines",
issn = "1946-3936",
publisher = "SAE International",
number = "4",

}

TY - JOUR

T1 - Studies on the Effect of In-Cylinder Charge Stratifications on High Load HCCI Combustion

AU - Yoshimura, Kei

AU - Mori, Shunichi

AU - Nakama, Kenjiro

AU - Kusaka, Jin

PY - 2016/1/1

Y1 - 2016/1/1

N2 - The objective of this article is to clarify the effect of thermal and equivalence ratio stratification on Homogeneous Charge Compression Ignition (HCCI) combustion under several conditions with three-dimensional computational fluid dynamics (3D CFD). Reynolds Averaged Navier-Stokes (RANS) simulation was used to calculate in-cylinder fluid dynamics. The 3D CFD simulation is also coupled with detailed chemical reaction to calculate HCCI combustion. First, the study with a simple engine model reveals that thermal stratification is more effective for prolonged combustion duration, which is a key factor for a high load limit of HCCI combustion, than equivalence ratio stratification. Thermal stratification has two-stage combustion: the combustion propagates from hot region slowly at first and then ignites in the entire in-cylinder region. Owing to this phenomenon, thermal stratification is more effective to mitigate HCCI combustion. Furthermore, thermal stratification enables combustion efficiency to be maintained: combustion efficiency would be a problem to relieve HCCI combustion by intake charge stratification. Second, the study with a detailed engine model was conducted to evaluate the improvement of the high load limit and thermal efficiency under the constraint of the maximum in-cylinder pressure and the pressure rise rate. In the second study, mixture stratification was produced by inducting hot and cold intake mixture from respective intake ports. The result shows that the temperature of in-cylinder hot gas region plays an important role to extend the high load limit of HCCI combustion.

AB - The objective of this article is to clarify the effect of thermal and equivalence ratio stratification on Homogeneous Charge Compression Ignition (HCCI) combustion under several conditions with three-dimensional computational fluid dynamics (3D CFD). Reynolds Averaged Navier-Stokes (RANS) simulation was used to calculate in-cylinder fluid dynamics. The 3D CFD simulation is also coupled with detailed chemical reaction to calculate HCCI combustion. First, the study with a simple engine model reveals that thermal stratification is more effective for prolonged combustion duration, which is a key factor for a high load limit of HCCI combustion, than equivalence ratio stratification. Thermal stratification has two-stage combustion: the combustion propagates from hot region slowly at first and then ignites in the entire in-cylinder region. Owing to this phenomenon, thermal stratification is more effective to mitigate HCCI combustion. Furthermore, thermal stratification enables combustion efficiency to be maintained: combustion efficiency would be a problem to relieve HCCI combustion by intake charge stratification. Second, the study with a detailed engine model was conducted to evaluate the improvement of the high load limit and thermal efficiency under the constraint of the maximum in-cylinder pressure and the pressure rise rate. In the second study, mixture stratification was produced by inducting hot and cold intake mixture from respective intake ports. The result shows that the temperature of in-cylinder hot gas region plays an important role to extend the high load limit of HCCI combustion.

UR - http://www.scopus.com/inward/record.url?scp=85042225293&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85042225293&partnerID=8YFLogxK

U2 - 10.4271/2016-32-0010

DO - 10.4271/2016-32-0010

M3 - Article

VL - 9

SP - 2337

EP - 2349

JO - SAE International Journal of Engines

JF - SAE International Journal of Engines

SN - 1946-3936

IS - 4

ER -