溢流条件下飞机结冰过程的传热特性研究

基于液/固相变和液膜流动的基础理论,对飞机结冰过程的传热特性进行了研究,建立了溢流与液/固相变耦合的结冰传热模型,并采用该模型对来流各参数对冰层生长特性的影响进行了分析.研究结果表明,结冰表面液态水的溢流将促进液/固相变过程,并进而提高冰层生长速率.气动剪切力是影响溢流效应的主要因素,来流速度越高,气动剪切力越大,溢流效应也越明显;反之,则溢流效应越微弱.在溢流条件下,来流参数中来流温度和速度是影响冰层生长速率的主要原因.来流速度越高或温度越低,则冰层生长速率越大,反之则生长速率越小.比较而言,液态水含量和水收集系数的变化对冰层生长速率的影响相对较小. 

Investigation of heat transfer characteristics of aircraft icing under runback water

The heat transfer characteristics of aircraft icing process were investigated based on the theories of liquid-solid phase change and film flowing.The heat transfer model which coupled runback water flowing with liquid-solid phase change was established and the influence of airflow parameters on the characteristics of icing growth was analyzed.The results indicate that the runback water on the icing surface will accelerate the liquid-solid phase change and speed up the icing process.The shear stress caused by the airflow is the key factor to the runback water flowing.The higher the airflow speed,the greater the shear stress and stronger the runback water flowing becomes,and vice versa.Under the condition of runback water flowing,the speed and temperature of the airflow are the main causes affecting the icing accretion.The higher the airflow speed or the lower the temperature,the greater the icing rate will be.The liquid water content and the collection efficiency have weak effect on the icing rate comparatively.