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Continuous wave laser absorption techniques for gasdynamic measurements in supersonic flows.

D F Davidson, A Y Chang, M D Dirosa

    Applied Optics
    |August 12, 2010
    PubMed
    Summary

    Researchers used laser absorption spectroscopy to measure flow properties in a shock tube. The study successfully determined velocity, temperature, and pressure, validating the laser-based methods against theoretical calculations.

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    Area of Science:

    • * Fluid Dynamics
    • * Laser Spectroscopy
    • * Shock Tube Analysis

    Background:

    • * Accurate measurement of transient flow properties is crucial for understanding complex aerodynamic phenomena.
    • * Traditional diagnostic methods often face limitations in resolution and non-intrusiveness.

    Purpose of the Study:

    • * To implement and validate three laser absorption schemes for in-situ measurements within a transient shock tube flow.
    • * To determine key flow parameters including velocity, temperature, pressure, density, and mass flux.

    Main Methods:

    • * Utilized an intracavity-doubled ring dye laser tuned to an OH transition (A(2)Σ+ ? X(2)Π (0,0) band at 306 nm).
    • * Employed H2O photolysis for OH generation and downstream detection.
    • * Applied Doppler shift and line intensity ratios for velocity and temperature determination, respectively.

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  • * Determined pressure via absorption magnitude and collisional broadening, with a third method for continuous velocity and pressure measurement.

    • Main Results:

    • * Successfully measured line-of-sight velocity, temperature, and pressure in a transient shock tube.
    • * Demonstrated the capability of laser absorption spectroscopy for quantitative analysis of shock tube flows.
    • * Obtained results that favorably compared with calculated values, indicating high accuracy.

    Conclusions:

    • * The developed laser absorption techniques provide a reliable and accurate method for diagnosing transient shock tube flows.
    • * These non-intrusive optical methods offer significant advantages over conventional techniques for flow characterization.
    • * The study validates the effectiveness of laser absorption spectroscopy in complex, high-speed flow environments.