机头结冰对大气数据系统测量影响研究

Effect of Aircraft Nose Icing on Atmospheric Data System Measurement

大气数据传感器安装于机头部位的飞机在遭遇结冰气象时,机头结冰会影响大气参数的测量精度。采用计算流体力学方法,对某两型运输飞机的大气数据系统进行模拟,考虑在机头结冰情况下的大气数据系统静压系数和迎角测量值的变化,获得了机头结冰对高度测量和速度测量的影响差量。研究表明,在两型运输飞机机头结冰状态下,中小迎角对大气数据系统静压和迎角测量的影响较小;大迎角对大气数据系统静压和迎角测量的影响较大,对应的高度测量影响量超过了10 m,速度测量影响量超过了2 kn。研究结果对于同类型飞机类似方向的研究具有一定的参考意义。

When the aircraft with the atmospheric data sensors installed on the nose encounters icing weather, the nose icing will affect the measurement accuracy of atmospheric parameters.The computational fluid dynamics method is used to simulate the atmospheric data system of two types of transport aircraft.Considering the changes of static pressure coefficient and angle of attack of the atmospheric data system under the condition of nose icing, the influence difference of nose icing on altitude measurement and speed measurement is obtained.The results show that aircraft nose icing for both aircrafts have a small impact on the measurement of static pressure and angle of attack of the air data system at low and moderate angles of attack.However, it has a relatively large impact on the measurement of static pressure and angle of attack at high angles of attack, and the influence of the corresponding height and velocity measurements exceeds 10 m and 2 kn respectively.This result have certain reference for the same type aircraft in the similar research direction.