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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Simultaneous laser-induced fluorescence and Raman imaging inside a hydrogen engine.

Sascha Ronald Engel1, Peter Koch, Andreas Braeuer

  • 1Lehrstuhl für Technische Thermodynamik, Universität Erlangen-Nürnberg,Am Weichselgarten 8, 91058 Erlangen, Germany. sascha.engel@ltt.uni-erlangen.de

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Simultaneous laser-induced fluorescence (LIF) and Raman scattering measurements were performed inside a hydrogen internal combustion engine. Trimethylamine (TMA) was found to be a more suitable LIF tracer molecule than triethylamine (TEA).

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Area of Science:

  • Combustion science
  • Spectroscopic diagnostics
  • Internal combustion engines

Background:

  • Accurate in-situ measurements are crucial for understanding hydrogen combustion.
  • Laser-induced fluorescence (LIF) and Raman scattering are powerful diagnostic techniques.
  • Simultaneous application of these techniques can provide complementary information.

Purpose of the Study:

  • To simultaneously measure laser-induced fluorescence (LIF) and Raman scattering (Ramanography) within a hydrogen internal combustion (IC) engine.
  • To compare the suitability of triethylamine (TEA) and trimethylamine (TMA) as LIF tracer molecules.
  • To validate the agreement between LIF and Ramanography results.

Main Methods:

  • Two-dimensional LIF and Ramanography measurements were conducted inside a hydrogen IC engine.
  • Triethylamine (TEA) and trimethylamine (TMA) were used as LIF tracer molecules.
  • Data from both techniques were analyzed and compared.

Main Results:

  • LIF and Raman scattering measurements showed excellent agreement.
  • Simultaneous Ramanography and LIF imaging demonstrated that TMA is a more suitable LIF tracer than TEA.
  • The study provides valuable data for optimizing hydrogen combustion diagnostics.

Conclusions:

  • Simultaneous LIF and Ramanography are effective for in-situ diagnostics in hydrogen IC engines.
  • Trimethylamine (TMA) is recommended as a superior LIF tracer molecule compared to triethylamine (TEA) for these applications.
  • These findings contribute to the advancement of combustion research and engine development.