飞机重力供油的计算研究

基于网络算法和时间微分思想,建立了一种新的飞机燃油系统的重力供油瞬态计算模型,解决了飞机重力供油的多支路交叉和瞬态过程的模拟问题。针对某型飞机燃油系统油箱和管路分布、发动机工况以及飞机飞行状态,计算了不同状态下飞机重力供油时,随着时间的变化,系统的压力分布、各油箱液面高度以及流量分配。计算结果用于某型飞机燃油系统的验证计算,效果良好。

Variations of Oil Levels of All Tanks in Aircraft under Gravity Feed

Purpose.Past calculations assumed that,under gravity feed,only one tank in aircraft supplies the oil needed for preventing extremely serious accident to happen.Actually,all oil tanks compete for supplying oil.Our method takes into consideration all oil tanks and therefore,we believe,our method is intrinsically superior to traditional methods and is closer to understanding the real seriousness of the oil supply situation.On the basis of network algorithm and time differential method,we established a new calculation model for gravity feed oil of aeroplane fuel system.This model can solve the multiple-branch and transient process simulation problem of gravity feed oil.Finally we give a numerical example for a certain type of aircraft.Fig.6 and Fig.7 give respectively the variations of oil level and flow mass per second of each of five oil tanks within a period of 16 000 seconds.These variations show preliminarily that our proposed method of calculations is satisfactory.