| Citation: | YU Tianzhi, LIU Aiguo, LI Hengwen, et al. Atomization characteristics of centrifugal nozzles in high-altitude cyclonic air field[J]. Journal of Aerospace Power, 2026, 41（1）：20240194 doi: 10.13224/j.cnki.jasp.20240194
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Numerical simulation was employed to investigate the atomization process of fuel passing through the centrifugal nozzle in the low-temperature and low-pressure cyclonic air flow field at high altitude. The flow field in the combustion chamber under the extreme operating environment at high altitude was analyzed, the characteristics of the combustion chamber and fuel atomization were examined, and the influencing factors were investigated. Additionally, the influence of different fuel temperatures on the atomization characteristics under the high-altitude environment was studied. The results showed that the combustion chamber cyclone outlet flow rate and turbulent kinetic energy intensity decreased under low temperature and low pressure conditions at high altitude. At the same pressure drop, the Sauter mean diameter (SMD) increased with the increasing altitude and droplet injection distance. Additionally, the percentage of droplets smaller than 20 μm decreased from 35.15% to 14.57%. The influence of low-pressure conditions on atomization characteristics was found to be stronger than that of low-temperature conditions. In high-altitude, low-temperature, and low-pressure environments, atomization characteristics can be improved by increasing the oil supply temperature. Flash boiling spray phenomenon occurred when the oil supply temperature reached 373.15 K. This significantly reduced the SMD and increased the percentage of droplets below 20 μm from 14.57% to 57.41%.
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