飞行状态下飞机燃油质量特性计算与研究

On Computation of Properties Relating to Mass of Fuel Needed in Aircraft Flight Dynamics

论述了在各种飞行姿态下飞机油箱中燃油质量特性的计算方法和实现技巧，详细介绍了数学描述方法及求解思路，并开发了相应的软件。

The ever-varying mass distribution of fuel which is hard to determine due to shape of container,etc,obviously exerts a big influence on flight quality of aircraft.P.R.China has relied on limited amount of experiments to obtain a crude solution of this problem.In the absence of information in the open literature,we study how to solve it and now present our idea of a software for its solution.Our idea consists of=(1)discretization of the volume of fuel container into slices parallel to the surface of fuel;(2)equalization of sum of slice volumes with known volume of fuel remaining in the container.The main difficulty we overcome is that regardless of the location of the fuel surface with respect to the container,our software can slice it successfully.Equalization means we take as many slices as needed until equalization is reached.We take one container of a fighter aircraft(Table 1).θandγindicate the location of fuel surface with respect to fuel container. Using our software,we can take the necessary number of slices and then compute its properties relating to mass,such as mass center, Ixx,etc.Application of our software to aircraft design remains to be done.