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    Single-beam velocimetry using a portable dual comb spectrometer (DCS) offers accurate flow measurements in supersonic ramjets. This advancement simplifies spatial interpretation compared to traditional crossed-beam methods.

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    Area of Science:

    • Fluid dynamics
    • Spectroscopy
    • Combustion science

    Background:

    • Laser absorption Doppler velocimetry (LADV) traditionally uses a crossed-beam configuration.
    • This configuration complicates spatial interpretation due to sampling different gas volumes.
    • Errors from laser frequency drift and absorption model uncertainty are inherent challenges.

    Purpose of the Study:

    • To develop and demonstrate single-beam velocimetry for improved spatial interpretation.
    • To achieve high-frequency accuracy and stability in velocimetry measurements.
    • To validate measurements in a supersonic ramjet engine environment.

    Main Methods:

    • Utilized a portable dual comb spectrometer (DCS) with GPS-referencing for high frequency accuracy and stability.
    • Developed and employed a new high-temperature water vapor absorption database.
    • Performed single-beam velocimetry measurements in a supersonic ramjet inlet flow.

    Main Results:

    • Demonstrated successful single-beam velocimetry measurements in a supersonic ramjet.
    • Achieved average measurement differences of 19 m/s compared to concurrent crossed-beam measurements.
    • Estimated DCS and database contributions to the measurement difference as 1.6 m/s and 13 m/s, respectively.

    Conclusions:

    • Single-beam velocimetry with DCS provides a viable alternative to crossed-beam methods.
    • The developed system offers improved spatial interpretation and high accuracy.
    • This technique has potential applications in advanced propulsion systems and high-temperature flow diagnostics.