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Dual-broadband rotational cars measurements in an IC engine

Bengtsson, Per Erik LU ; Martinsson, Lars; Aldén, Marcus LU ; Johansson, Bengt LU ; Lassesson, Bengt; Marforio, Karl and Lundholm, Gunnar LU (1994) In Symposium (International) on Combustion 25(1). p.1735-1742
Abstract

This is the first report of pure rotational coherent anti-Stokes Raman spectroscopy (CARS) measurementsin an internal combustion (IC) engine. Single-shot, dual-broadband rotational CARS (DB-RCARS) spectra were recorded both prior to ignition and in the postcombustion gases. From these spectra, both temperature and relative oxygen concentrations were evaluated. The pressure was registered simultaneously with the CARS measurements in the spark-ignition engine burning natural gas and air. Prior to ignition, normally at temperatures below 1000 K and pressures below 2 MPa, a rotational CARS spectrum is very temperature sensitive, and the technique can be used for temperature measurements with high accuracy. Evaluated temperatures show a... (More)

This is the first report of pure rotational coherent anti-Stokes Raman spectroscopy (CARS) measurementsin an internal combustion (IC) engine. Single-shot, dual-broadband rotational CARS (DB-RCARS) spectra were recorded both prior to ignition and in the postcombustion gases. From these spectra, both temperature and relative oxygen concentrations were evaluated. The pressure was registered simultaneously with the CARS measurements in the spark-ignition engine burning natural gas and air. Prior to ignition, normally at temperatures below 1000 K and pressures below 2 MPa, a rotational CARS spectrum is very temperature sensitive, and the technique can be used for temperature measurements with high accuracy. Evaluated temperatures show a negligible dependence on uncertainties in parameters such as the nonresonant susceptibility of the gas and the slit width. Moreover, no collisional narrowing of the lines has to be taken into account. The relative standard deviation of evaluated temperatures and of relative oxygen concentrations from single-shot measurements were as low as 1, and 1.4-1.9%, respectively. In the postcombustion gases at temperatures above 2000 K and pressures above 1.5 MPa, the nonresonant CARS background gave a large contribution to the total spectrum. In this temperature and pressure range, the evaluated values of temperature and nonresonant susceptibility are not independent, and the nonresonant susceptibility had to be fixed at a precalculated value to get a reliable temperature evaluation. The avantages and disadvantages of rotational CARS in comparison with vibrational CARS for IC engine measurements are discussed. © 1994 Combustion Institute.

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author
organization
publishing date
type
Contribution to journal
publication status
published
in
Symposium (International) on Combustion
volume
25
issue
1
pages
8 pages
publisher
Combustion Institute
external identifiers
  • Scopus:0003091702
ISSN
0082-0784
DOI
10.1016/S0082-0784(06)80822-2
language
English
LU publication?
yes
id
5fd3c743-b1f5-4d59-b706-72bc57d78353
date added to LUP
2016-06-29 17:00:28
date last changed
2016-10-23 04:44:21
@misc{5fd3c743-b1f5-4d59-b706-72bc57d78353,
  abstract     = {<p>This is the first report of pure rotational coherent anti-Stokes Raman spectroscopy (CARS) measurementsin an internal combustion (IC) engine. Single-shot, dual-broadband rotational CARS (DB-RCARS) spectra were recorded both prior to ignition and in the postcombustion gases. From these spectra, both temperature and relative oxygen concentrations were evaluated. The pressure was registered simultaneously with the CARS measurements in the spark-ignition engine burning natural gas and air. Prior to ignition, normally at temperatures below 1000 K and pressures below 2 MPa, a rotational CARS spectrum is very temperature sensitive, and the technique can be used for temperature measurements with high accuracy. Evaluated temperatures show a negligible dependence on uncertainties in parameters such as the nonresonant susceptibility of the gas and the slit width. Moreover, no collisional narrowing of the lines has to be taken into account. The relative standard deviation of evaluated temperatures and of relative oxygen concentrations from single-shot measurements were as low as 1, and 1.4-1.9%, respectively. In the postcombustion gases at temperatures above 2000 K and pressures above 1.5 MPa, the nonresonant CARS background gave a large contribution to the total spectrum. In this temperature and pressure range, the evaluated values of temperature and nonresonant susceptibility are not independent, and the nonresonant susceptibility had to be fixed at a precalculated value to get a reliable temperature evaluation. The avantages and disadvantages of rotational CARS in comparison with vibrational CARS for IC engine measurements are discussed. © 1994 Combustion Institute.</p>},
  author       = {Bengtsson, Per Erik and Martinsson, Lars and Aldén, Marcus and Johansson, Bengt and Lassesson, Bengt and Marforio, Karl and Lundholm, Gunnar},
  issn         = {0082-0784},
  language     = {eng},
  number       = {1},
  pages        = {1735--1742},
  publisher    = {ARRAY(0xbe82ae8)},
  series       = {Symposium (International) on Combustion},
  title        = {Dual-broadband rotational cars measurements in an IC engine},
  url          = {http://dx.doi.org/10.1016/S0082-0784(06)80822-2},
  volume       = {25},
  year         = {1994},
}