| Citation: | WU Yongkang, ZHU Jianqin, CHENG Zeyuan, et al. Influence of PCHE channel shape on oxidation coking characteristics of aviation kerosene[J]. Journal of Aerospace Power, 2025, 40（4）：20240503 doi: 10.13224/j.cnki.jasp.20240503
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The oxidation coking process of aviation kerosene with straight and Z-shaped PCHE (printed circuit heat exchanger) channels was numerically calculated. The influences of the shape of the channels on the oxidation coking of aviation kerosene with different mass flow and heat flux were analyzed. The results showed that, when the turning angle of the channel gradually increased from 0° (straight) to 25° (Z-shaped), the total mass of coking decreased first and then increased, and the distribution along the channel presented multi-peak characteristics. When the angle was small, the coking mechanism induced by the boundary layer at high temperature dominated the coking process, and the secondary flow induced by the transition gradually increased with the increase of the angle, resulting in the inhibition of heat transfer and enhanced coking. When the turning angle was large, the coking mechanism induced by high temperature gradient was dominant, and the secondary flow could increase the temperature gradient, which led to the uneven distribution of coking rate along the way, and intensified the coking deposition at the corner. The coking mass decreased with the increase of mass flow rate and increased with the increase of heat flux. The larger turning angle indicated the more obvious effect of increasing mass flow rate on inhibiting coking.
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