An Investigation on the Ignition Characteristics of Lubricant Component Containing Fuel Droplets Using Rapid Compression and Expansion Machine

Masaharu Kassai, Taisuke Shiraishi, Toru Noda, Mamoru Hirabe, Yoshiki Wakabayashi, Jin Kusaka, Yasuhiro Daisho

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

With the development of downsized spark ignition (SI) engines, low-speed pre-ignition (LSPI) has been observed more frequently as an abnormal combustion phenomenon, and there is a critical need to solve this issue. It has been acknowledged that LSPI is not directly triggered by autoignition of the fuel, but by some other material with a short ignition delay time. It was previously reported that LSPI can be caused by droplets of lubricant oil intermixed with the fuel. In this work, the ignition behavior of lubricant component containing fuel droplets was experimentally investigated by using a constant volume chamber (CVC) and a rapid compression and expansion machine (RCEM), which enable visualization of the combustion process in the cylinder. Various combinations of fuel compositions for the ambient fuel-air mixture and fractions of base oil/metallic additives/fuel for droplets were tested. CVC results confirmed the high ignitability of lubricant component containing fuel droplets in pre-heated air, which was responsible for the early timing of LSPI. RCEM results also revealed the high ignitability of lubricant component containing fuel droplets in the premixed fuel/air mixture. Stochastic occurrence of ignition induced by fuel droplets was also observed, particularly under a condition of a small lubricant oil fraction. Finally, the contribution of base oil and metallic additives to the ignitability (delay times and probabilities) of droplets was separately evaluated to understand the fundamental mechanism involved. Results confirmed that the base oil itself can promote the high ignitability of fuel droplets and that metallic additives can also additionally promote or inhibit the ignitability of droplets in the premixed fuel-air mixture.

Original languageEnglish
Pages (from-to)469-480
Number of pages12
JournalSAE International Journal of Fuels and Lubricants
Volume9
Issue number3
DOIs
Publication statusPublished - 2016 Jan 1

Fingerprint

Lubricants
Ignition
Compaction
Air
Time delay
Fuel additives
Engine cylinders
Internal combustion engines
Visualization
Oils
Chemical analysis

ASJC Scopus subject areas

  • Fuel Technology
  • Pollution

Cite this

An Investigation on the Ignition Characteristics of Lubricant Component Containing Fuel Droplets Using Rapid Compression and Expansion Machine. / Kassai, Masaharu; Shiraishi, Taisuke; Noda, Toru; Hirabe, Mamoru; Wakabayashi, Yoshiki; Kusaka, Jin; Daisho, Yasuhiro.

In: SAE International Journal of Fuels and Lubricants, Vol. 9, No. 3, 01.01.2016, p. 469-480.

Research output: Contribution to journalArticle

Kassai, Masaharu ; Shiraishi, Taisuke ; Noda, Toru ; Hirabe, Mamoru ; Wakabayashi, Yoshiki ; Kusaka, Jin ; Daisho, Yasuhiro. / An Investigation on the Ignition Characteristics of Lubricant Component Containing Fuel Droplets Using Rapid Compression and Expansion Machine. In: SAE International Journal of Fuels and Lubricants. 2016 ; Vol. 9, No. 3. pp. 469-480.
@article{cf2c3521de8a478dbfe15f423b88c6ea,
title = "An Investigation on the Ignition Characteristics of Lubricant Component Containing Fuel Droplets Using Rapid Compression and Expansion Machine",
abstract = "With the development of downsized spark ignition (SI) engines, low-speed pre-ignition (LSPI) has been observed more frequently as an abnormal combustion phenomenon, and there is a critical need to solve this issue. It has been acknowledged that LSPI is not directly triggered by autoignition of the fuel, but by some other material with a short ignition delay time. It was previously reported that LSPI can be caused by droplets of lubricant oil intermixed with the fuel. In this work, the ignition behavior of lubricant component containing fuel droplets was experimentally investigated by using a constant volume chamber (CVC) and a rapid compression and expansion machine (RCEM), which enable visualization of the combustion process in the cylinder. Various combinations of fuel compositions for the ambient fuel-air mixture and fractions of base oil/metallic additives/fuel for droplets were tested. CVC results confirmed the high ignitability of lubricant component containing fuel droplets in pre-heated air, which was responsible for the early timing of LSPI. RCEM results also revealed the high ignitability of lubricant component containing fuel droplets in the premixed fuel/air mixture. Stochastic occurrence of ignition induced by fuel droplets was also observed, particularly under a condition of a small lubricant oil fraction. Finally, the contribution of base oil and metallic additives to the ignitability (delay times and probabilities) of droplets was separately evaluated to understand the fundamental mechanism involved. Results confirmed that the base oil itself can promote the high ignitability of fuel droplets and that metallic additives can also additionally promote or inhibit the ignitability of droplets in the premixed fuel-air mixture.",
author = "Masaharu Kassai and Taisuke Shiraishi and Toru Noda and Mamoru Hirabe and Yoshiki Wakabayashi and Jin Kusaka and Yasuhiro Daisho",
year = "2016",
month = "1",
day = "1",
doi = "10.4271/2016-01-2168",
language = "English",
volume = "9",
pages = "469--480",
journal = "SAE International Journal of Fuels and Lubricants",
issn = "1946-3952",
publisher = "SAE International",
number = "3",

}

TY - JOUR

T1 - An Investigation on the Ignition Characteristics of Lubricant Component Containing Fuel Droplets Using Rapid Compression and Expansion Machine

AU - Kassai, Masaharu

AU - Shiraishi, Taisuke

AU - Noda, Toru

AU - Hirabe, Mamoru

AU - Wakabayashi, Yoshiki

AU - Kusaka, Jin

AU - Daisho, Yasuhiro

PY - 2016/1/1

Y1 - 2016/1/1

N2 - With the development of downsized spark ignition (SI) engines, low-speed pre-ignition (LSPI) has been observed more frequently as an abnormal combustion phenomenon, and there is a critical need to solve this issue. It has been acknowledged that LSPI is not directly triggered by autoignition of the fuel, but by some other material with a short ignition delay time. It was previously reported that LSPI can be caused by droplets of lubricant oil intermixed with the fuel. In this work, the ignition behavior of lubricant component containing fuel droplets was experimentally investigated by using a constant volume chamber (CVC) and a rapid compression and expansion machine (RCEM), which enable visualization of the combustion process in the cylinder. Various combinations of fuel compositions for the ambient fuel-air mixture and fractions of base oil/metallic additives/fuel for droplets were tested. CVC results confirmed the high ignitability of lubricant component containing fuel droplets in pre-heated air, which was responsible for the early timing of LSPI. RCEM results also revealed the high ignitability of lubricant component containing fuel droplets in the premixed fuel/air mixture. Stochastic occurrence of ignition induced by fuel droplets was also observed, particularly under a condition of a small lubricant oil fraction. Finally, the contribution of base oil and metallic additives to the ignitability (delay times and probabilities) of droplets was separately evaluated to understand the fundamental mechanism involved. Results confirmed that the base oil itself can promote the high ignitability of fuel droplets and that metallic additives can also additionally promote or inhibit the ignitability of droplets in the premixed fuel-air mixture.

AB - With the development of downsized spark ignition (SI) engines, low-speed pre-ignition (LSPI) has been observed more frequently as an abnormal combustion phenomenon, and there is a critical need to solve this issue. It has been acknowledged that LSPI is not directly triggered by autoignition of the fuel, but by some other material with a short ignition delay time. It was previously reported that LSPI can be caused by droplets of lubricant oil intermixed with the fuel. In this work, the ignition behavior of lubricant component containing fuel droplets was experimentally investigated by using a constant volume chamber (CVC) and a rapid compression and expansion machine (RCEM), which enable visualization of the combustion process in the cylinder. Various combinations of fuel compositions for the ambient fuel-air mixture and fractions of base oil/metallic additives/fuel for droplets were tested. CVC results confirmed the high ignitability of lubricant component containing fuel droplets in pre-heated air, which was responsible for the early timing of LSPI. RCEM results also revealed the high ignitability of lubricant component containing fuel droplets in the premixed fuel/air mixture. Stochastic occurrence of ignition induced by fuel droplets was also observed, particularly under a condition of a small lubricant oil fraction. Finally, the contribution of base oil and metallic additives to the ignitability (delay times and probabilities) of droplets was separately evaluated to understand the fundamental mechanism involved. Results confirmed that the base oil itself can promote the high ignitability of fuel droplets and that metallic additives can also additionally promote or inhibit the ignitability of droplets in the premixed fuel-air mixture.

UR - http://www.scopus.com/inward/record.url?scp=85018724286&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85018724286&partnerID=8YFLogxK

U2 - 10.4271/2016-01-2168

DO - 10.4271/2016-01-2168

M3 - Article

AN - SCOPUS:85018724286

VL - 9

SP - 469

EP - 480

JO - SAE International Journal of Fuels and Lubricants

JF - SAE International Journal of Fuels and Lubricants

SN - 1946-3952

IS - 3

ER -