Laser ignition (LI) of both liquid fuels and gaseous combustible mixtures in gas turbines offers the potential for reduced emissions and increased reliability. During the combustion process, carbon and other by-products accumulate on the walls of the combustion chamber. For laser based ignition systems, this could potentially reduce the transmissive properties of the output window required for transmission of the laser radiation into the combustion chamber. Presented in this paper is an empirical study into the laser cleaning of an output window for the removal of accumulated carbon prior to laser ignition, with the mechanism of removal discussed.

Topics
Fuels, Combustion engine, Plasma confinement, Chemical elements
1.
Graf
J
,
Weinrotter
M
,
Kopecek
H
,
Wintner
E
.
Laser Ignition, Optics and Contamination of Optics in an I.C. Engine
.
ASME Conference Proceedings
2004
;
2004
(
37467
):
11
–
17
.
Google Scholar
 
2.
Hirvonen
J
,
Pekka
K
,
Takala
M
, inventors.
Imatran Voima Oy, assignee. Assembly for Combustion Chamber Monitoring Camera
. Finland patent 5592217.
1993
Jan
.
7
,
1997
.
Google Scholar
 
3.
Mullett
JD
,
Dearden
G
,
Dodd
R
,
Shenton
AT
,
Triantos
G
,
Watkins
KG
.
A comparative study of optical fibre types for application in a laser-induced ignition system
.
Journal of Optics A: Pure and Applied Optics
2009
;
11
(
5
):
054007
.
https://doi.org/10.1088/1464-4258/11/5/054007
Google Scholar
Crossref
Search ADS
 
4.
Weinrotter
M
,
Kopecek
H
,
Tesch
M
,
Wintner
E
,
Lackner
M
,
Winter
F.
Laser ignition of ultra-lean methane/hydrogen/air mixtures at high temperature and pressure
.
Exp Therm Fluid Sci
2005
6;
29
(
5
):
569
–
577
.
https://doi.org/10.1016/j.expthermflusci.2004.08.002
Google Scholar
Crossref
Search ADS
 
5.
Morsy
MH
,
Ko
YS
,
Chung
SH
.
Laser-induced ignition using a conical cavity in CH4–air mixtures
.
Combust Flame
1999
12;
119
(
4
):
473
–
482
.
https://doi.org/10.1016/S0010-2180(99)00060-7
Google Scholar
Crossref
Search ADS
 
6.
Morsy
MH
,
Chung
SH
.
Laser-induced multi-point ignition with a single-shot laser using two conical cavities for hydrogen/air mixture
.
Exp Therm Fluid Sci
2003
4;
27
(
4
):
491
–
497
.
https://doi.org/10.1016/S0894-1777(02)00252-2
Google Scholar
Crossref
Search ADS
 
7.
Watkins
KG
,
Curran
C
,
Lee
J.
Two new mechanisms for laser cleaning using Nd:YAG sources
.
Journal of Cultural Heritage
2003
1;
4
, Supplement1(
0
):
59
–
64
.
Google Scholar
 
8.
Chen
Y
,
Lewis
JWL
,
Parigger
C.
Spatial and temporal profiles of pulsed laser-induced air plasma emissions
.
Journal of Quantitative Spectroscopy and Radiative Transfer 2000 10/16
;
67
(
2
):
91
–
103
.
https://doi.org/10.1016/S0022-4073(99)00196-X
Crossref
Search ADS
 
9.
Yalcin
S
,
Crosley
D
,
Smith
G
,
Faris
G.
Spectroscopically Determined Temperatures and Electron Densities in Laser Produced Sparks
.
Int OSA Annual Meeting Technical Digest
1995
:
147
.
Google Scholar
 
10.
Steen
WM
,
Mazumder
J.
Laser Materials Processing
. 6th ed.:
Springer
;
2010
.
Google Scholar
 
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2012
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