积冰密度对机翼除冰过程影响的数值研究

Numerical investigation of ice density effects on airfoil de-icing process

针对不同类型的积冰,采用数值方法研究了不同冰密度对于电加热除冰过程中热传导及冰融化过程的影响。选取了典型结冰条件下所生成的两种霜冰及明冰作为分析对象,以标准的三维电加热除冰模型作为数值模拟研究模型,设置温度监测点,取金属蒙皮与冰的交界面作为监测面,在电加热除冰过程中记录监测点及监测面的温度变化情况。通过比较不同密度积冰融化过程中监测点与监测面的温度变化情况,分析积冰密度对冰融化过程的影响。计算结果表明,冰密度对电热除冰过程具有明显的影响,积冰密度降低会提高积冰温度升高的速度,使得积冰初始融化的时刻提前,整个融化过程缩短。

For different types of ice accretion on the airfoil surface under different icing conditions, numerical method is used to study the ice density effect on the heat conduction and the ice melting process during electrothermal de icing process. A standard three dimensional electrothermal de icing model, which is covered with different ice on the airfoil metal surface, is applied in the numerical simulation. The temperature at several points in the simulated model is monitored, and the interface between the airfoil metal surface and the ice is set as the monitoring surface. The temperature variations are recorded at these monitored points and surfaces during the simulation of electrothermal de icing process. These temperature characteristics can be used to analyze the effect of the ice density on the ice melting. Three kinds of ice with different densities are selected as the research objects. The temperature variations of rime ice during the melting process are compared with glaze ice. The results indicate that the ice density has significant effect on the electrothermal de icing process. When the ice density decreases, the speed of the ice temperature rising increases, together with early initial time for the ice melting, and the whole melting process is shortened.