气温和空气湿度对桨叶覆冰特性影响的实验研究

Experimental Study of the Influence of Air Temperature and Humidity on the Ice Covering Characteristics of a Blade

在人工环境实验室模拟风力机桨叶表面覆冰的过程,探索主要气象参数(气温和空气相对湿度)变化对风力机桨叶表面覆冰的影响。实验结果表明:空气温度为-5～-8℃时最有利于空气中所含水份凝结成冰,且空气中水份含量才是结冰的重要来源,在某一湿度条件下,温度越低冻结速度越快;空气温度一定时,结冰速度随相对湿度呈单调增加关系;在气温和湿度一定时,结冰时间越长,冰层越厚;冻结时间变长以后,冻结厚度增加速率有一定减缓趋势。

In an artificial environment laboratory,simulated was the process of ice covering the surface of a blade of a wind turbine and explored was the influence of the change of the main meteorological parameters(air temperature and relative humidity) on the ice covering the surface of the blade of the wind turbine.The test results show that when the air temperature is in a range from-5 ℃ to-8 ℃,it is most favorable for the water contained in the air to be condensed to ice and the water contained in the air is an important source for icing.At a relative humidity,the lower the temperature and the higher the freezing speed.When the air temperature is kept constant,the icing speed will assume a monotone increment relationship with the relative humidity.When the air temperature and humidity are constant,the longer the icing time duration and the thicker the ice layer.After the freezing time duration has been prolonged,the freezing thickness growth speed assumes a certain slowing-down tendency.