Analysis method for oxygen volume fraction in inerting process of multi-compartment fuel tanks in civil aircraft
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摘要:
针对民机多隔舱燃油箱惰化过程中氧气体积分数分析的难题，提出了一种基于流动模式识别并引入掺混修正项的氧气体积分数分析模型。通过将相邻隔舱间的气体掺混效应纳入建模过程，使得模型更加适配工程实际场景，通过某民用支线飞机平台的工程化应用，基于16架次研发试飞和4架次符合性试飞完成掺混系数修正与模型仿真精度验证，结果表明模型仿真误差下限不超过−0.26%，满足工程需求。研究发现，航后地面阶段相邻隔舱因掺混作用可在15 min内实现氧气体积分数趋同，验证了掺混效应对惰化均匀性的促进作用。忽略掺混将导致下降阶段仿真数据与试飞数据显著偏离，航后地面阶段前隔舱氧气体积分数误差达1.5%。研究成果为惰化系统设计及适航符合性验证提供了可靠技术支撑，已获多国适航机构认可。
Abstract: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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Key words:
- multi-compartment fuel tank /
- inerting process /
- oxygen volume fraction /
- gas blending /
- flight test
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图 8 常温天长航程试飞架次模型验证（不考虑掺混）
Figure 8. Standard day long range flight test validation （without considering gas blending effect）
图 9 暖天长航程试飞架次模型验证（不考虑掺混）
Figure 9. Warm day long range flight test validation （without considering gas blending effect）
图 10 常温天长航程试飞架次模型验证（考虑掺混）
Figure 10. Standard day long range flight test validation （considering gas blending effect）
图 11 暖天长航程试飞架次模型验证（考虑掺混）
Figure 11. Warm day long range flight test validation （considering gas blending effect）
表 1 符合性试飞架次信息
Table 1. Compliance flight test information
试飞架次 飞行时长 航前场温/℃ 测点位置 暖天短航程 2 h20 min 29.2 中央翼油箱 暖天长航程 7 h 24.1 中央翼油箱 常温天短航程 2 h9 min 10.4 中央翼油箱 常温天长航程 6 h33 min 10.5 中央翼油箱 
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表 2 仿真误差
Table 2. Simulation error
试飞架次 氧气体积分数仿真误差/% 左中央翼油箱隔舱 右中央翼油箱隔舱 暖天短航程 +1.67 +0.99 暖天长航程 +0.31 −0.26 常温天短航程 +0.34 +0.08 常温天长航程 +0.69 +0.21
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