| Citation: | JIANG Hua, ZHOU Yusui, GUAN Tianlin. Fuel transfer thermal effect of civil aircraft auxiliary fuel tank on main fuel tank[J]. Journal of Aerospace Power, 2026, 41（1）：20250057 doi: 10.13224/j.cnki.jasp.20250057
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To quantitatively analyze the thermal effect of fuel transfer from the auxiliary fuel tank (AFT) on the main fuel tank in a civil aircraft, an exponential function model of the fuel tank thermal analysis was constructed with time constant and equilibrium temperature difference as the thermal characteristic parameters, which can quickly evaluate the thermal effect. By deriving the heat transfer relationships during AFT operations, the thermal time constant of the main fuel tank was maintained while focusing on adjusting the equilibrium temperature difference, and a proportional coefficient to quantify correction values was proposed. Based on a typical civil aircraft AFT retrofitting scenario, a main fuel tank thermal analysis model compatible with AFT transfer was constructed by modifying its fundamental thermal characteristic parameter matrix, and fuel temperature simulation under multi-flight test flight scenarios was conducted. The comparison test flight data showed that the simulation value was always slightly larger than the test data, and the simulation accuracy met the AC25.981-2A requirements. The rapid modeling approach for main fuel tank considering AFT transfer heat effects can be applied to flammability analysis of main fuel tanks in civil aircraft equipped with AFT. This demonstrated compliance with CCAR-25-R4 25.981(b), thus providing an engineering solution for developing relevant aircraft models.
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