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Cryogenic Liquid Jets for High Repetition Rate Discovery Science
Published on: May 9, 2020
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Multi-parameter, kHz rate spectrally resolved NO PLIF in a supersonic jet.
Optics Letters
|February 13, 2026
Summary
This study introduces rapid, multi-parameter spectrally resolved planar laser-induced fluorescence (SR-PLIF) for accurate temperature, pressure, and velocity measurements in high-speed flows. The technique offers calibration-free, spatially resolved data crucial for validating complex simulations.
Area of Science:
- Fluid dynamics
- Laser-based diagnostics
- Spectroscopy
Background:
- Characterizing high-speed flows requires quantitative, high-bandwidth measurements of temperature, pressure, and velocity.
- Validating complex numerical simulations of fluid dynamics is essential for advancing engineering applications.
- Existing diagnostic techniques may lack the necessary spatial resolution or multi-parameter capabilities for comprehensive flow analysis.
Purpose of the Study:
- To demonstrate a rapid, multi-parameter spectrally resolved planar laser-induced fluorescence (SR-PLIF) technique.
- To enable spatially resolved, calibration-free measurements of temperature, pressure, and velocity.
- To validate the SR-PLIF technique for characterizing high-speed flows and supporting numerical simulations.
Main Methods:
- Utilized nitric oxide gamma-bands near 225.33 nm for spectrally resolved planar laser-induced fluorescence (SR-PLIF).
- Employed a static gas cell for validation across a temperature range of 295-420 K and pressure range of 3.48-20.4 kPa.
- Applied the SR-PLIF diagnostic to study an underexpanded jet at rates up to 1 kHz with 220 µm spatial resolution.
Main Results:
- Achieved an average temperature error of 2% and pressure error of 4% during static gas cell validation.
- Demonstrated successful application of SR-PLIF to an underexpanded jet at high acquisition rates.
- Observed favorable agreement between SR-PLIF measurements and numerical simulations of the underexpanded jet.
Conclusions:
- The developed SR-PLIF technique provides accurate, calibration-free, multi-parameter measurements for high-speed flow characterization.
- SR-PLIF is a valuable tool for validating numerical simulations, improving the reliability of computational fluid dynamics.
- This rapid diagnostic capability opens new avenues for studying dynamic and complex flow phenomena.
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