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In-cylinder Surface Thermometry using Laser Induced Phosphorescence

Algotsson, Martin LU ; Knappe, Christoph LU ; Tunér, Martin LU ; Richter, Mattias LU ; Johansson, Bengt LU and Aldén, Marcus LU (2012) The Eighth International Conference on Modeling and Diagnostics for Advanced Engine Systems In [Host publication title missing] p.482-487
Abstract
Surface temperature in internal combustion engines is of high interest when studying heat losses. Two approaches for

retrieving the surface temperatures are thermocouples and Laser Induced Phosphorescence, LIP. This study aims to

analyze LIP as a technique for measuring surface temperature in internal combustion engines. The motivation for this

study is the need for accurate surface temperatures which can be used by predictive models and increase knowledge

about heat transfer.

In this work LIP measurements have been carried out in two optical engines. In the first engine a thermographic

phosphor was applied on top of a metal piston. The second engine was fitted with a quartz liner which... (More)
Surface temperature in internal combustion engines is of high interest when studying heat losses. Two approaches for

retrieving the surface temperatures are thermocouples and Laser Induced Phosphorescence, LIP. This study aims to

analyze LIP as a technique for measuring surface temperature in internal combustion engines. The motivation for this

study is the need for accurate surface temperatures which can be used by predictive models and increase knowledge

about heat transfer.

In this work LIP measurements have been carried out in two optical engines. In the first engine a thermographic

phosphor was applied on top of a metal piston. The second engine was fitted with a quartz liner which was coated with

phosphor material. Several coating thicknesses have been tested and the LIP temperature was extracted from both

opposing sides of the phosphor. Both engines were run in HCCI mode with reference fuels and electrically heated air.

In a previous publication, the authors showed that a layer of phosphor can show different temperatures i.e. a higher

temperature on the side facing the cylinder gas than on the side facing the wall. In this study it is shown which thickness

is needed to accurately present the temperature for typical engine combustion. With an increasing thickness of the

phosphor material, the surface gets gradually insulated and the phosphor temperature reading becomes inaccurate.

LIP measurements from a quartz ring and a metal piston have been compared and the temperature increase during

combustion is similar although the heat conductivity of quartz is 40-200 times smaller than the metal piston.

Measurements with thermocouples often show a lower temperature increase than what is seen in the LIP results. The

difference in heat conductivity between the phosphor coating and the underlying surface is of importance for

understanding what temperature is actually measured. (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
subject
keywords
Heat transfer, surface temperature, HCCI, laser induced phosphorescence (LIP)
in
[Host publication title missing]
pages
6 pages
publisher
Japan Society of Mechanical Engineers
conference name
The Eighth International Conference on Modeling and Diagnostics for Advanced Engine Systems
external identifiers
  • Scopus:84877868923
language
English
LU publication?
yes
id
3c895de2-702f-4051-a065-bb10c34b8a43 (old id 3232492)
date added to LUP
2012-12-07 14:25:48
date last changed
2017-01-01 07:59:59
@inproceedings{3c895de2-702f-4051-a065-bb10c34b8a43,
  abstract     = {Surface temperature in internal combustion engines is of high interest when studying heat losses. Two approaches for<br/><br>
retrieving the surface temperatures are thermocouples and Laser Induced Phosphorescence, LIP. This study aims to<br/><br>
analyze LIP as a technique for measuring surface temperature in internal combustion engines. The motivation for this<br/><br>
study is the need for accurate surface temperatures which can be used by predictive models and increase knowledge<br/><br>
about heat transfer.<br/><br>
In this work LIP measurements have been carried out in two optical engines. In the first engine a thermographic<br/><br>
phosphor was applied on top of a metal piston. The second engine was fitted with a quartz liner which was coated with<br/><br>
phosphor material. Several coating thicknesses have been tested and the LIP temperature was extracted from both<br/><br>
opposing sides of the phosphor. Both engines were run in HCCI mode with reference fuels and electrically heated air.<br/><br>
In a previous publication, the authors showed that a layer of phosphor can show different temperatures i.e. a higher<br/><br>
temperature on the side facing the cylinder gas than on the side facing the wall. In this study it is shown which thickness<br/><br>
is needed to accurately present the temperature for typical engine combustion. With an increasing thickness of the<br/><br>
phosphor material, the surface gets gradually insulated and the phosphor temperature reading becomes inaccurate.<br/><br>
LIP measurements from a quartz ring and a metal piston have been compared and the temperature increase during<br/><br>
combustion is similar although the heat conductivity of quartz is 40-200 times smaller than the metal piston.<br/><br>
Measurements with thermocouples often show a lower temperature increase than what is seen in the LIP results. The<br/><br>
difference in heat conductivity between the phosphor coating and the underlying surface is of importance for<br/><br>
understanding what temperature is actually measured.},
  author       = {Algotsson, Martin and Knappe, Christoph and Tunér, Martin and Richter, Mattias and Johansson, Bengt and Aldén, Marcus},
  booktitle    = {[Host publication title missing]},
  keyword      = {Heat transfer,surface temperature,HCCI,laser induced phosphorescence (LIP)},
  language     = {eng},
  pages        = {482--487},
  publisher    = {Japan Society of Mechanical Engineers},
  title        = {In-cylinder Surface Thermometry using Laser Induced Phosphorescence},
  year         = {2012},
}