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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。
Windshield heating system control law is an important part of system design. The finite volume method was used to simulate the control law of wind turbine heating system of a certain type of aircraft. The transient changes of temperature and electric heating power under flight envelope were calculated. The differences of transient changes of temperature and heating power under different weather conditions were analyzed. The actual work of the system under the law. The results show that the temperature of the outer surface and the thermal conductive film is greatly influenced by the external environment due to the thermal inertia of the glass. After the system reaches the steady state when the temperature reaches the steady state, the temperature basically works at a lower power level. Showing an increasing trend; design rules can also continue to optimize the control to make the system has a better heating efficiency. The results of this study can provide reference for the design of windshield warming system.