某型机风挡加温系统控制规律的数值模拟

风挡电加温系统的控制规律是系统设计的重要部分。采用有限容积法模拟某型机风挡加温系统的控制规律,计算飞行包线下的温度和电加热功率的瞬时变化情况,分析在不同的天气条件下温度和加热功率瞬态变化的差异,得到实际情况下系统的工作规律。结果表明:由于玻璃具有热惯性,系统加温达到稳定状态后,基本上在较低的功率水平工作;外表面和导热膜的温度受外界环境影响较大,内表面的温度在加热过程中总体呈现增加趋势;设计时控制规律还可不断优化,以使系统具有更好的加热效率。该研究结果可为风挡加温系统的设计提供参考。

Numerical Simulation of Control Law of an Aircraft Windshield Heating System

The control law is the important part of the windshield heating system design.The control law is simulated by finite volume method.The influence of the climate on the system is analyzed by simulating the control rules under the whole flight envelop.The work rules of system in the actual situation are obtained.The final results demonstrate that system operates at the lower power when it is stable because of the thermal inertia.The environment has a great influence on the temperature of outer surface and heat conducting film.The temperature of the inner surface increases when system is working.The control law can be optimized to increase the system heating efficiency.It can be provided as a reference to the design for the windshield heating system.