| Citation: | JIANG Hua, XUE Yong, ZHANG Bin. Analysis method for oxygen volume fraction in inerting process of multi-compartment fuel tanks in civil aircraft[J]. Journal of Aerospace Power, 2026, 41（2）：20250369 doi: 10.13224/j.cnki.jasp.20250369
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To address the challenge of oxygen volume fraction analysis in the inerting process of multi-compartment fuel tanks for civil aircraft, an oxygen volume fraction analysis model based on flow pattern recognition with the incorporation of a gas blending correction term was proposed. By incorporating the gas blending effect between adjacent compartments into the modeling process, the model became more adaptable to real-world engineering scenarios. Through engineering applications on a certain regional airliner platform, the blending coefficient correction and model simulation accuracy verification were completed based on 16 development test flights and 4 compliance test flights. The results demonstrated that the model’s simulation error remained within a lower limit of −0.26%, meeting engineering requirements. It revealed that during the post-flight ground phase, adjacent compartments can achieve oxygen volume fraction convergence within 15 min due to mixing effects, verifying the promoting role of blending in inerting uniformity. Neglecting blending effects could lead to significant deviations between simulation data and flight test data during the descent phase, with oxygen volume fraction errors reaching 1.5% in the forward compartment during the post-flight ground phase. The research outcomes could provide a reliable technical support for inerting system design and airworthiness compliance verification, helping to gain recognition from multiple national airworthiness authorities.
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