| Citation: | LIANG Hongxia, HUANG Wenpu, JU Hongyu, et al. Experimental and numerical study on dynamic pressure characteristics in hydrogen blending premixed combustor[J]. Journal of Aerospace Power, 2026, 41（3）：20250095 doi: 10.13224/j.cnki.jasp.20250095
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Hydrogen fuel is currently an important research direction for gas turbines due to its advantages of zero carbon emissions and renewability. However, due to the fast chemical reaction rate and high combustion velocity of hydrogen, thermoacoustic oscillations can be easily triggered. To investigate the acoustic characteristics of the natural gas hydrogen premixed combustor, experimental measurements and numerical calculations were conducted on the dynamic pressure inside the combustor under different hydrogen blending ratios and turbulent pulsation velocities. The results showed that under the test conditions, during the process of increasing the hydrogen blending ratio from 0% to 30%, as the hydrogen blending ratio increased, the main frequency of dynamic pressure in the combustor remained within the range of 70 Hz to 76 Hz. However, when the hydrogen blending ratio reached 40%, the main frequency of dynamic pressure pulsation jumped from 75.36 Hz to 197 Hz, indicating a mode transition phenomenon. With the increase of turbulent pulsation velocity, the frequency of dynamic pressure oscillation gradually increased. Under numerical calculation conditions, with the increase of hydrogen blending ratio, the high-frequency dynamic pressure inside the combustor showed a gradually increasing trend, and the distribution of OH radicals showed a trend of outward diffusion. Under different hydrogen blending ratios, the vortex clusters in the combustor transformed from rotation mode to vortex shedding mode. The discrete vortex cluster fragmentation in pure hydrogen combustion was significantly higher than that in other hydrogen blending ratio schemes, which was consistent with the variation of OH radical distribution with hydrogen blending ratio.
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