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Temperature measurements in shock tubes using a laser-based absorption technique.

A Y Chang, E C Rea, R K Hanson

    Applied Optics
    |May 11, 2010
    PubMed
    Summary
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    A new laser technique accurately measures temperature in shock tube flows. This method uses optical absorption spectroscopy of hydroxyl (OH) radicals for precise, real-time temperature monitoring.

    Area of Science:

    • Fluid dynamics
    • Laser spectroscopy
    • Combustion science

    Background:

    • Shock tube experiments are crucial for studying high-temperature gas dynamics.
    • Accurate temperature measurement is essential for understanding shock wave phenomena.
    • Existing methods may lack the temporal or spatial resolution required for transient flows.

    Purpose of the Study:

    • To develop and validate a rapid, non-intrusive laser-based method for temperature measurement in shock tube flows.
    • To utilize optical absorption spectroscopy of hydroxyl (OH) radicals for thermometry.
    • To achieve high accuracy and temporal resolution in temperature diagnostics.

    Main Methods:

    • Employed a rapid-tuning ring-dye laser system.
    • Recorded fully resolved absorption spectra of specific OH radical lines (R(1)(7) and R(1)(11) near 306.5 nm).

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  • Inferred temperature from the ratio of peak absorption coefficients of the selected OH lines.

    • Main Results:

    • Successfully demonstrated a laser-based thermometry technique for shock tube flows.
    • Achieved temperature measurements in the range of 1300-3500 K.
    • Obtained agreement within +/-3% compared to calculated reflected shock temperatures.

    Conclusions:

    • The developed laser absorption spectroscopy method provides accurate temperature measurements in high-temperature shock tube environments.
    • This technique offers a valuable tool for fundamental research in high-speed flows and combustion.
    • The method's precision and non-intrusive nature make it suitable for transient, high-temperature gas dynamic studies.