| Citation: | YUAN Xun, YU Xin, PENG Jiangbo, et al. Combustion diagnosis of ramjet in high-enthalpy shock tunnel using high-speed OH-PLIF[J]. Journal of Aerospace Power, 2026, 41(5):20240647 doi: 10.13224/j.cnki.jasp.20240647 |
To address the research gap in high-frequency planar laser-induced fluorescence (PLIF) combustion diagnostics for high-Mach number scramjet engines, a high-enthalpy shock tunnel high-frequency PLIF measurement system was developed. For the first time, high-frequency OH-PLIF combustion diagnostic tests were conducted under nominal Mach number 10 flight simulation conditions in a free piston-driven high-enthalpy shock tunnel. Time series images of OH-PLIF in the combustion chamber were obtained for both ethylene and hydrogen injection cases. By comparing the background images, it was observed that the test gas reached the engine flow path approximately 8 ms after the tunnel startup for ethylene injection. The OH in the combustion flame was found to be distributed closer to the cowl side, and shock wave structures parallel to the rear edge of the cavity on the compression side were observed within the rectangular flow path. Compared with ethylene injection, hydrogen injection resulted in earlier ignition around 3 ms after tunnel startup due to the ablation effect, leading to a flame distribution that was nearly uniform across the entire field. These findings were in good agreement with the combustion chamber pressure data.
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