某无人机爬升过程中燃油温度变化规律仿真研究

采用 RON95# 车用汽油或 100LL 航空汽油为燃料的中空长航时无人机在爬升过程中容易遭遇气阻。利用 Flowmaster 软件搭建某型无人机燃油系统的仿真模型,以实际飞行试验中的环境温度、初始燃油温度、初始燃油量、耗油率等参数作为边界条件,通过仿真得到飞行过程中油箱内燃油温度,并与实际飞行试验数据进行对比,验证仿真模型的可行性;利用该模型定量研究环境温度、燃油油量、耗油率、爬升速度等因素对燃油温度变化规律的影响。结果表明:对于某型无人机燃油系统,在连续爬升过程中燃油温度的变化受初始外界环境温度、爬升速度的影响比较大,而燃油油量、耗油率则对燃油温度变化的影响较小;初始外界环境温度越低、燃油油量越少、耗油率越快、爬升速度越大则燃油温度下降幅度越大。

Simulation Research on Fuel Temperature Variation Law of A UAV During Climbing

In order to study the fuel temperature during the continuous climbing process of a UAV, the simulation model of the UAV fuel system is built by using the Flowmaster software. Taking the parameters of environment temperature, initial fuel temperature, initial fuel quantity and fuel consumption rate as boundary conditions, the fuel temperature in the fuel tank during the flight is obtained by simulation. The feasibility of the simulation model is verified by comparing with the actual flight test data. Based on the simulation model, the influence of environment temperature, fuel consumption, fuel consumption rate, climbing speed and other factors on the fuel change law is further quantitatively studied. The research results can provide scientific basis for the flight test of the UAV and the design of ventilation and pressurization system.