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<p>Accurate measurement of liquid fuel distribution is essential for optimizing injector design in liquid-fueled engines. This study investigated a pyrromethene-based fluorescent dye dissolved in exoTHDCPD as a candidate for use as a seeded tracer for PLIF diagnostics. The dyes were optically characterized using a 532 nm CW laser. Fluorescence spectra and intensities were measured in a heated cuvette setup using a spectrometer and sCMOS camera. The relative error of the reference dye (fluorescein) in jet experiments validated a Gaussian error propagation model. Among the tested dyes, pyrromethene 567 exhibited nearly five times the signal intensity of the reference up to 160 °C. The model predictions agreed well with experimental results. Using pyrromethene 567 with a 2.15 W CW laser and a 0.2 ms exposure time, the model estimates a measurement precision better than 1 % under a beam height of 9.8 mm and thickness of 0.25 mm.</p>

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Optical characterization of pyrromethene dyes as seeded tracer for fuel PLIF in high temperature

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Hyunchang Lee

摘要

Accurate measurement of liquid fuel distribution is essential for optimizing injector design in liquid-fueled engines. This study investigated a pyrromethene-based fluorescent dye dissolved in exoTHDCPD as a candidate for use as a seeded tracer for PLIF diagnostics. The dyes were optically characterized using a 532 nm CW laser. Fluorescence spectra and intensities were measured in a heated cuvette setup using a spectrometer and sCMOS camera. The relative error of the reference dye (fluorescein) in jet experiments validated a Gaussian error propagation model. Among the tested dyes, pyrromethene 567 exhibited nearly five times the signal intensity of the reference up to 160 °C. The model predictions agreed well with experimental results. Using pyrromethene 567 with a 2.15 W CW laser and a 0.2 ms exposure time, the model estimates a measurement precision better than 1 % under a beam height of 9.8 mm and thickness of 0.25 mm.