射弹打击下油箱燃油泄露研究  

Fuel Leaking of Fuel Tank by Projectiles Impact

作　　者：蔡海亮[1] 宋笔锋[1] 裴扬[1] 

机构地区：[1]西北工业大学航空学院,西安710072

出　　处：《机电一体化》2013年第2期42-46,58,共6页Mechatronics

基　　金：国家自然科学基金项目(No.11102159)

摘　　要：为了确定射弹击穿飞机油箱后附近干舱的引燃和燃烧,需要对燃油通过穿孔泄露过程中燃油的泄露质量及雾化液滴的数目和尺寸进行定量计算分析。该文建立了用于模拟高速射弹击穿油箱后燃油泄露过程的解析模型,给出了燃油初始泄露速度的定量计算方法,利用最大熵原理和质量守恒定律,推出了弹丸撞击条件下泄露燃油液滴尺寸数目分布函数和索特尔平均直径SMD的计算公式,并采用Harmon液滴索特尔平均直径经验计算公式定量计算泄露燃油的平均直径。研究结果表明燃油的初始泄露速度随射弹速度的增加而呈线性增加,液滴索特尔平均直径随穿孔直径的增加而增加,随射弹速度的增加而呈线性减小。研究结果为下一步进行油箱附近于舱引燃和燃烧提供理论基础。For making sure the dry bay ignition and fire, it＇s necessary to calculate the number and the sizes of the droplets and determine the massflow rate of the fuel induced by high-speed impact and penetration of a rigid projectile into fuel tank. An analytical model is founded and the method for calculating the initial leaking velocity of the fuel is determined. It gives the equation for calculating the drop size distributions of fuel and the Sauter mean diameter （SMD） of droplets, through the maximum entropy theory and the conservation for mass. Using the Harmon＇ s equation for SMD, the fuel droplets SMD can be calculated. Results shows that the initial leaking velocity of the fuel is about linearly increasing with the velocity of the projectile, the SMD of fuel droplets increases with the hole size of the fuel tank which induced by the penetration of the projectile and linearly decreases with the velocity of the projectile. The results can be used for the ignition and fire analysis of the dry bay adjacent to fuel tanks.

关 键 词：射弹 油箱 燃烧 液滴 索特尔平均直径 

分 类 号：V228.11[航空宇航科学与技术—飞行器设计]