Advanced

The effect of knock on the heat transfer in an SI engine : Thermal boundary layer investigation using CARS temperature measurements and heat flux measurements

Grandin, Börje; Denbratt, Ingemar; Bood, Joakim LU ; Brackmann, Christian LU and Bengtsson, Per Erik LU (2000) International Fall Fuels and Lubricants Meeting and Exposition In SAE Technical Papers
Abstract

It is generally accepted that knocking combustion influences the heat transfer in SI engines. However, the effects of heat transfer on the onset of knock is still not clear due to lack of experimental data of the thermal boundary layer close to the combustion chamber wall. This paper presents measurements of the temperature in the thermal boundary layer under knocking and non-knocking conditions. The temperature was measured using dual-broadband rotational Coherent anti-Stokes Raman Spectroscopy (CARS). Simultaneous time-resolved measurements of the cylinder pressure, at three different locations, and the heat flux to the wall were carried out. Optical access to the region near the combustion chamber wall was achieved by using a... (More)

It is generally accepted that knocking combustion influences the heat transfer in SI engines. However, the effects of heat transfer on the onset of knock is still not clear due to lack of experimental data of the thermal boundary layer close to the combustion chamber wall. This paper presents measurements of the temperature in the thermal boundary layer under knocking and non-knocking conditions. The temperature was measured using dual-broadband rotational Coherent anti-Stokes Raman Spectroscopy (CARS). Simultaneous time-resolved measurements of the cylinder pressure, at three different locations, and the heat flux to the wall were carried out. Optical access to the region near the combustion chamber wall was achieved by using a horseshoe-shaped combustion chamber with windows installed in the rectangular part of the chamber. This arrangement made CARS temperature measurements close to the wall possible and results are presented in the range 0.1-5 mm from the wall. The engine was run with constant fuel flow under near stoichiometric conditions. Knocking and non-knocking conditions were achieved by using different mixtures of n-heptane and iso-octane. Copyright © 2000 Society of Automotive Engineers, Inc.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
in
SAE Technical Papers
conference name
International Fall Fuels and Lubricants Meeting and Exposition
external identifiers
  • scopus:84875726007
DOI
10.4271/2000-01-2831
language
English
LU publication?
yes
id
fbd9a9e2-261b-424c-a0b3-4d8e445717b9
date added to LUP
2016-06-29 17:33:56
date last changed
2017-04-16 04:38:42
@inproceedings{fbd9a9e2-261b-424c-a0b3-4d8e445717b9,
  abstract     = {<p>It is generally accepted that knocking combustion influences the heat transfer in SI engines. However, the effects of heat transfer on the onset of knock is still not clear due to lack of experimental data of the thermal boundary layer close to the combustion chamber wall. This paper presents measurements of the temperature in the thermal boundary layer under knocking and non-knocking conditions. The temperature was measured using dual-broadband rotational Coherent anti-Stokes Raman Spectroscopy (CARS). Simultaneous time-resolved measurements of the cylinder pressure, at three different locations, and the heat flux to the wall were carried out. Optical access to the region near the combustion chamber wall was achieved by using a horseshoe-shaped combustion chamber with windows installed in the rectangular part of the chamber. This arrangement made CARS temperature measurements close to the wall possible and results are presented in the range 0.1-5 mm from the wall. The engine was run with constant fuel flow under near stoichiometric conditions. Knocking and non-knocking conditions were achieved by using different mixtures of n-heptane and iso-octane. Copyright © 2000 Society of Automotive Engineers, Inc.</p>},
  author       = {Grandin, Börje and Denbratt, Ingemar and Bood, Joakim and Brackmann, Christian and Bengtsson, Per Erik},
  booktitle    = {SAE Technical Papers},
  language     = {eng},
  title        = {The effect of knock on the heat transfer in an SI engine : Thermal boundary layer investigation using CARS temperature measurements and heat flux measurements},
  url          = {http://dx.doi.org/10.4271/2000-01-2831},
  year         = {2000},
}