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Two-color-Scheimpflug laser-induced incandescence technique for soot concentration measurements in space-limited combustion field
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Sijie YAN1, Pengji DING1, *, Linsen WANG2, Jie LI3, Zhenyu XU4, Shuang CHEN2
Journal of Experiments in Fluid Mechanics | 2026, 40(3) : 100 - 112
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Journal of Experiments in Fluid Mechanics | 2026, 40(3): 100-112
• Measuring Technique •
Two-color-Scheimpflug laser-induced incandescence technique for soot concentration measurements in space-limited combustion field
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Sijie YAN1, Pengji DING1, *, Linsen WANG2, Jie LI3, Zhenyu XU4, Shuang CHEN2
Affiliations
  • 1School of Nuclear Science and Technology, Lanzhou University, Lanzhou　730000, China
  • 2Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang　621000, China
  • 3School of Power and Energy, Northwestern Polytechnical University, Xi’an　710129, China
  • 4Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei　230031, China
Published: 2026-06-25 doi: 10.11729/syltlx20240092
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To address the need for measuring soot concentration distributions in complex and spatially constrained combustion flow fields, such as the outlet of aero-engine combustors, this study developed the Two-color-Scheimpflug Laser-Induced Incandescence (2C-Scheimpflug LII) technique and a corresponding measurement system, which obtains soot volume fraction distribution images by employing an oblique imaging method. The technique and measurement system validation experiments were first conducted under specific conditions using three typical ethylene/air flames (McKenna, Gülder, and Santoro). Comparisons with measurement results obtained by other researchers under the same conditions demonstrate the feasibility of the 2C-Scheimpflug LII system. The test results in standard flames show that the lower detection limit of soot volume fraction measurements of our system is approximately 2.0 × 10−9. Further, the 2C-Scheimpflug LII technique was applied to measure the spatial distribution of soot volume fractions at the transverse cross-section of the outlet and the longitudinal section of a single-sector, dual-swirler aero-engine model combustor. The preliminary results show that the soot volume fraction distribution at the combustor outlet exhibits high instantaneous variability and randomness, while within the combustor, the soot volume fraction displays a V-shaped distribution.

aero-engine combustor  /  soot  /  laser induced incandescence  /  scheimpflug imaging
Sijie YAN, Pengji DING, Linsen WANG, Jie LI, Zhenyu XU, Shuang CHEN. Two-color-Scheimpflug laser-induced incandescence technique for soot concentration measurements in space-limited combustion field[J]. Journal of Experiments in Fluid Mechanics, 2026 , 40 (3) : 100 -112 . DOI: 10.11729/syltlx20240092
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Article Info
doi: 10.11729/syltlx20240092
  • Receive Date：2024-12-04
  • Online Date：2026-09-02
  • Published：2026-06-25
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History
  • Received：2024-12-04
  • Revised：2025-01-17
  • Accepted：2025-01-28
Affiliations
    1School of Nuclear Science and Technology, Lanzhou University, Lanzhou　730000, China
    2Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang　621000, China
    3School of Power and Energy, Northwestern Polytechnical University, Xi’an　710129, China
    4Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei　230031, China
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