针对冰晶被航空发动机吸入后在热气流环境下的运动换热问题,建立了拉格朗日框架下冰晶运动-传热传质耦合的数值计算方法,对比了不同的冰晶融化模型和不同形状、粒径冰晶的运动换热差异.结果表明,相较于水覆盖模型,使用"裸"冰粒子模型时完全融化需要更长时间,20 μm粒子需要0.04 s才能完全融化,但0.023 s之前"裸"冰粒子的融化速率却更快;相同条件下球形冰晶液态水含量较高,20 μm球形冰晶在计算出口处液态水含量为49.05%.椭球形和宽六角形冰晶液态水含量很相近,出口处液态水含量为40%左右;粒径越小,越早开始融化,冰晶液态水含量总是更高.20 μm的冰晶在出口处液态水含量高达60.4%,而40 μm冰晶在出口处液态水含量只有15.5%.
This study investigates the dynamic behavior and heat transfer of ice crystals in high-temperature air flow after being ingested by an aero-engine.A numerical model under the Lagrange framework is built to simulate ice crystal motion,heat and mass transfer.Different ice crystal melting models and ice crystals with various shapes and sizes are also compared.The results show that when using the"naked"ice particle model,it takes longer to completely melt compared with the water cover model.It takes 0.04 s for a 20 μm particle to melt,but the melting rate of a"naked"ice particle is faster before 0.023 s.Under the same condition,the liquid water content of a spherical ice crystal is high,and that of a 20 μm spherical one is 49.05%at the outlet.The liquid water contents of ellipsoidal and hexagonal plate ice crystals are close,which are roughly 40%at the outlet.The smaller the size,the earlier the crystals start to melt,and the higher the liquid water content of the crystals.The liquid water content is 60.4%of a 20 μm ice crystal and only 15.5%of a 40 μm one at the outlet.