Temperature and relative oxygen concentration fields were measured in an optically accessible solid fuel ramjet combustor using coherent anti-Stokes Raman scattering (CARS). Additionally, planar laser-induced fluorescence measurements of the hydroxyl radical (OH-PLIF) were performed to spatially characterize flame structure. The experiment was operated with an inlet air temperature of 670 K, mass flow rate of 1.14 kg/s, and pressure of 0.57 MPa. The dual-pump CARS system provided simultaneous measurements of the nitrogen Q-branch ro-vibrational energy level structure of nitrogen and pure-rotational energy level structure of nitrogen and oxygen. These spectra possess ample features for comparison to theory at temperatures of 600–2500 K. Comparison between CARS and OH-PLIF measurements indicated that the highest temperature and highest OH-PLIF intensity are located within the downstream extent of the recirculation zone. A comparison of wall-normal profiles of the OH-PLIF and CARS measurements indicates that maximum temperature standard deviation matches the mean location of flame heat release, while the maximum temperature better correlates with the OH-PLIF intensity. A bulk transport of hot combustion products toward the wall is observed in the instantaneous OH-PLIF images. This phenomenon is critical for the energy transfer to the grain that supports the local fuel regression to support the diffusion flame.


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    Title :

    Temperature, Oxygen Concentration, and Flame Structure Measurements in Solid Fuel Ramjet Combustor


    Contributors:

    Published in:

    AIAA Journal ; 63 , 8 ; 3434-3444


    Publication date :

    2025-08-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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