| Citation: | ZHU Long, SUN Shiping, HU Zheng. Multi-objective optimization design of strut-type lattice cooling thin channel[J]. Journal of Aerospace Power, 2025, 40（10）：20240445 doi: 10.13224/j.cnki.jasp.20240445
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The coupled fluid-solid-thermal finite element model of the active cooling channels in a scramjet combustion chamber was established using the substructure method. The effects of the number of struts on the heat transfer characteristics of strut-type lattice cooling channels under identical volume fractions and loading conditions were investigated, and a multi-objective optimization of the strut cross-sectional shape was conducted. The results showed that, compared with the rectangular smooth channel, the average Nusselt number of the strut-type lattice channel increased by at least 64.2%, significantly enhancing the heat transfer performance of the cooling channel, but the flow resistance increased by more than 5.8 times; the heat transfer performance of the strut-type lattice channel first increased and then decreased with the increase in the number of struts, with the two-strut lattice channel exhibiting the best heat transfer performance. The multi-objective optimization results of the lattice channel, which aimed to maximize the average Nusselt number, and minimize the pressure drop with the highest temperature, showed that under the same volume fraction, the more number of struts meant the lesser impact of the cross-sectional shape on the flow and heat transfer performance of the lattice channel. The circular cross-section strut served as a suitable solution for balancing heat transfer and pressure drop requirements for two or more struts-type lattice channels. The optimal solutions of the single-strut lattice channel exhibited the largest improvement in the target performance, of which the average Nussle number of the compromise solution increased by 20.2%, the maximum temperature decreased by 4.4%, and the pressure drop increased by 55.1%, demonstrating better overall performance. The results could provide a reference for the design of lattice channels.
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