冰晶在涡扇发动机内相变换热特性

通过对低压压气机通道内气流参数的分析，结合冰晶的运动轨迹方程及相变传热传质方程的离散处理，计算分析了冰晶在涡扇发动机内涵通道内运动过程的粒子半径、冰晶温度、冰晶速度、冰水混合粒子中液态水质量分数、以及冰晶表面与低压压气机通道内气流的传热系数和传质系数沿压气机轴向距离的分布，得到了冰晶在低压压气机内涵通道内运动的轨迹及与叶片碰撞的特性。结果显示:20μm冰晶黏附位置处液态水质量分数为10.22%，而100μm冰晶在压气机出口处液态水质量分数仅为2.1%且不会在压气机内结冰。 

Phase change heat transfer characteristic of ice crystal ingested into turbofan engine

Through analysis of airflow parameters in low pressure compressor flow passage, and by discretization of the motion equation and phase change heat and mass transfer equation of ice crystal, the ice crystal radii, ice crystal temperature, ice crystal velocity, liquid water mass fraction of ice-water mixture, heat transfer coefficient and mass transfer coefficient between ice crystal surface and airflow in low pressure compressor along axial position of compressor were calculated. The trajectory of ice crystal in low pressure compressor and collision characteristics between ice crystal and blades were obtained. The result shows that the liquid water mass fraction of 20μm ice crystal at adhesion position is 10.22% while liquid water mass fraction of 100μm ice crystal at the compressor outlet is just 2.1% and there will be no ice accretion inside the compressor.