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.
Temperature, Oxygen Concentration, and Flame Structure Measurements in Solid Fuel Ramjet Combustor
AIAA Journal ; 63 , 8 ; 3434-3444
01.08.2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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