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Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Tsekenis, S. A.; Wilson, D.; Lengden, M.; Hyvönen, J.; Leinonen, J.; Shah, A. LU ; Andersson, Ö. and McCann, H. (2015) In Flow Measurement and Instrumentation
Abstract

A feasibility study is presented and the achieved key design milestones towards the first application of Chemical Species Tomography by Near-IR Absorption Tomography on a heavy duty, large-bore marine engine to visualise relative mixture strength are described. The engine is equipped with pre-chamber ignition and operates using Liquefied Natural Gas with >88.9% methane content. Operation of the engine under maximum-load conditions is a key design requirement, with peak cylinder pressure and mean temperature exceeding 127,510. Torr (170. bar) and 850. K respectively. The near-IR spectroscopic behaviour of methane is examined for suitable absorption and reference regions for the above application. In particular, the spectroscopic... (More)

A feasibility study is presented and the achieved key design milestones towards the first application of Chemical Species Tomography by Near-IR Absorption Tomography on a heavy duty, large-bore marine engine to visualise relative mixture strength are described. The engine is equipped with pre-chamber ignition and operates using Liquefied Natural Gas with >88.9% methane content. Operation of the engine under maximum-load conditions is a key design requirement, with peak cylinder pressure and mean temperature exceeding 127,510. Torr (170. bar) and 850. K respectively. The near-IR spectroscopic behaviour of methane is examined for suitable absorption and reference regions for the above application. In particular, the spectroscopic absorption around the 2ν3 transition region near 1666. nm is approximated by simulation using data from the HITRAN database under worst-case conditions. The simulation results are compared with methane spectra experimentally acquired at high temperature and ambient pressure. Interference from other chemical species as well as measurement linearity is also investigated. A 31-laser beam tomographic imaging array is proposed, which has been optimised to achieve higher spatial resolution performance in the vicinity of the pre-chamber's orifices. To enable optical access, a novel, minimally-intrusive method is presented, utilising standard fibre-optics and collimators.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Chemical Species Tomography, In-cylinder engine diagnostics, Infra-red absorption spectroscopy, Marine engine, Pre-chamber
in
Flow Measurement and Instrumentation
publisher
Elsevier
external identifiers
  • Scopus:84964344877
ISSN
0955-5986
DOI
10.1016/j.flowmeasinst.2016.04.006
language
English
LU publication?
yes
id
c1007634-92ef-48b8-b2b3-382c61fd0d7b
date added to LUP
2016-10-14 13:41:37
date last changed
2016-10-14 13:41:37
@misc{c1007634-92ef-48b8-b2b3-382c61fd0d7b,
  abstract     = {<p>A feasibility study is presented and the achieved key design milestones towards the first application of Chemical Species Tomography by Near-IR Absorption Tomography on a heavy duty, large-bore marine engine to visualise relative mixture strength are described. The engine is equipped with pre-chamber ignition and operates using Liquefied Natural Gas with &gt;88.9% methane content. Operation of the engine under maximum-load conditions is a key design requirement, with peak cylinder pressure and mean temperature exceeding 127,510. Torr (170. bar) and 850. K respectively. The near-IR spectroscopic behaviour of methane is examined for suitable absorption and reference regions for the above application. In particular, the spectroscopic absorption around the 2ν3 transition region near 1666. nm is approximated by simulation using data from the HITRAN database under worst-case conditions. The simulation results are compared with methane spectra experimentally acquired at high temperature and ambient pressure. Interference from other chemical species as well as measurement linearity is also investigated. A 31-laser beam tomographic imaging array is proposed, which has been optimised to achieve higher spatial resolution performance in the vicinity of the pre-chamber's orifices. To enable optical access, a novel, minimally-intrusive method is presented, utilising standard fibre-optics and collimators.</p>},
  author       = {Tsekenis, S. A. and Wilson, D. and Lengden, M. and Hyvönen, J. and Leinonen, J. and Shah, A. and Andersson, Ö. and McCann, H.},
  issn         = {0955-5986},
  keyword      = {Chemical Species Tomography,In-cylinder engine diagnostics,Infra-red absorption spectroscopy,Marine engine,Pre-chamber},
  language     = {eng},
  month        = {11},
  publisher    = {ARRAY(0x627d2b8)},
  series       = {Flow Measurement and Instrumentation},
  title        = {Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber},
  url          = {http://dx.doi.org/10.1016/j.flowmeasinst.2016.04.006},
  year         = {2015},
}