The imaging experiment of Methylidyne (CH) radical generated from methane combustion on a swirl burner was carried out using Planar Laser Induced Fluorescence technology (PLIF), and the C-X (0,0) band was selected as the excitation method. The laser wavelength and laser energy have a significant impact on the signal strength and signal-to-noise ratio of CH radical, and the imaging quality of CH reached the best with the laser wavelength and energy are of 314.415 nm and 0.3 mJ. The fluorescence signal of CH radical from swirling flame mainly distributed on the outside of the image and exists in a narrow area. As the of equivalence ratio of methane combustion increased, the signal of CH radical gradually strengthened, and the flame profile of chemiluminescence gradually evolved from "V" type to "M" type, and the number of vortices formed by CH radical from PLIF imaging gradually increased.
A single-laser-shot N2 Q-branch Coherent Anti-Stokes Raman Scattering (CARS) is used to measure the instantaneous temperature of supersonic combustion in kerosene/air flame with Mach 2.6. The Unstable-resonator spatially enhanced detection (USED) phase matching is used to reduce turbulence effects and to improve the CARS signal intensity. An USED CARS measurement system, which has a high spatial solution of ~100μm in diameter, and a CARS spectrum calculating and fitting program CARSCF are developed. The CARS signal in supersonic combustion is measured and then used to calculate temperature, the results show that, during kerosene/Air ignited in Mach 2.6, the CARS signal first rise rapidly then fall sharply and finally rise slowly, while the temperature increase sharply and then decrease slowly and the average temperature is 1970 ± 144K with 6.5% of repeatability.
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