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Thermometry in internal combustion engines via dual-broadband rotational coherent anti-Stokes Raman spectroscopy

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Author

Summary, in English

Rotational coherent anti-Stokes Raman spectroscopy (CARS) has since the beginning of the 1980s been developed as a non-intrusive tool for temperature measurements in combustion. Since the introduction of the dual-broadband concept in 1986, the quality of the technique has been much improved, and application to practical combustion situations facilitated. Since the first demonstration of its use in spark-ignition engines in 1993, several measurement campaigns in engines have been accomplished. These campaigns concerned temperature measurements in the unburned gas mixture before combustion as part of a larger project with the aim of improving the knowledge on the phenomenon of engine knock. In this paper, the results of this work are reviewed with a focus on the characteristics of the technique and the quality of the evaluated temperatures. Re-evaluations of data using an improved theoretical model are presented and compared with previous results. Moreover, the treatment of large data sets on single shots from spatial regions with conditions varying from unburned to burned gas is discussed. It is demonstrated that dual-broadband rotational CARS probing nitrogen and oxygen has a high potential for thermometry at the conditions in the unburned gas mixture. Merits and limitations of the technique are discussed and the issues treated are, among others, experimental problems, data evaluation, and single-shot temperature accuracy.

Department/s

Publishing year

2004

Language

English

Pages

13-25

Publication/Series

Measurement Science & Technology

Volume

15

Issue

3

Document type

Journal article review

Publisher

IOP Publishing

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • combustion
  • laser spectroscopy
  • coherent anti-Stokes Raman spectroscopy
  • gas-phase thermometry
  • engines

Status

Published

ISBN/ISSN/Other

  • ISSN: 0957-0233