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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Method for analyzing the effect of projectile impact on aircraft fuel tank inerting for survivability design
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Method for analyzing the effect of projectile impact on aircraft fuel tank inerting for survivability design

机译：用于生存能力设计的弹丸撞击对飞机油箱惰化影响的分析方法

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摘要

Inerting is an important measure to prevent fire and explosion, and enhance the survivability of an aircraft. In the battle environment, the hits from the projectiles or fragments on the fuel tank may affect the inerting effectiveness. By modifying the traditional scrubbing inerting model, this paper proposes a new inerting analysis method considering the impact of the projectiles. A series of events are introduced including the changes in either of the velocity and temperature of the projectiles, the air increase in the ullage brought by the projectiles, and the heat transfer between the projectiles and the surroundings. Examples show that the fuel load has significant effect on the oxygen concentration and the vapor/air ratio, while the velocity, the mass and the temperature of the projectile have less effect on the two parameters. In addition, the changes in the flight altitude have almost no effect on the vapor/air ratio, while having little effect on the oxygen concentration. Moreover, when the fuel tank suffers multiple hits by the projectiles, the ignition possibility or vulnerability in the ullage will increase significantly.
机译：惰化是防止火灾和爆炸并提高飞机生存能力的重要措施。在战斗环境中，子弹或燃油箱碎片的撞击可能会影响惰化效果。通过修改传统的擦洗惯性模型，提出了一种考虑弹丸影响的新型惯性分析方法。引入了一系列事件，包括弹丸速度和温度的变化，弹丸引起的空缺中空气的增加以及弹丸与周围环境之间的热传递。实例表明，燃料负荷对氧浓度和气/气比有显着影响，而射弹的速度，质量和温度对这两个参数的影响较小。另外，飞行高度的变化对蒸气/空气比几乎没有影响，而对氧气浓度几乎没有影响。此外，当燃料箱受到弹丸的多次撞击时，点火的可能性或缺损中的易损性将大大增加。

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