航空发动机内冰晶的融化特性和积冰特性

Melting and Accumulation Characteristics of Ice Crystals in Aero‑engines

冰晶结冰可能导致发动机损坏或熄火,严重威胁飞行安全,因此提高冰晶结冰预测的精度意义重大。本文考虑叶片厚度的影响,建立了冰晶结冰全过程的数值模型,探究了气流参数、冰晶吸入位置和叶片厚度对冰晶融化特性和积冰特性的影响。研究结果表明,在高风速下,冰晶的融化速度快,传热时间短,导致液态水含量低。不同吸入位置的冰晶在内流道的运动轨迹表明,冰晶在前两级叶片发生弹性碰撞,而在后三级叶片发生粘附。叶片厚度对冰晶结冰特性的影响显著,考虑叶片厚度后,积冰面积扩大,主积冰区域沿定子叶片尾缘后移,各定子叶片积冰更加集中。

Ice crystal icing has the potential to induce engine damage or flameout,posing a serious threatening to flight safety.Therefore,it is of great importance to improve the precision of ice crystal icing prediction.Considering the effect of blade thickness,we develop a numerical model to simulate the entire process of ice crystal icing.The influences of airflow parameters,ice crystal suction position and blade thickness are examined on the characteristics of ice crystal melting and accumulation.The findings show a high melting rate of ice crystals at high air velocities,accompanied by a relatively short heat transfer duration,resulting in a low liquid water content.The trajectories of ice crystals at different suction positions are simulated,which reveals that elastic collision occurs at the first two blades,while adhesion takes place at the last three blades.The effect of blade thickness is found to be significant.The ice accumulation area is expanded,the main ice accumulation is shifted toward stators backwards,and the ice accumulation in each stator is more concentrated after taking blade thickness into account.