Experimental Investigation on Ice Accretion Upon Ice Particle Impacting onto Heated Surface
Experimental Investigation on Ice Accretion Upon Ice Particle Impacting onto Heated Surface
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DOI：
10.2514/1.j062425
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发表时间：
2023-03
期刊：
影响因子：
2.5
通讯作者：
Haiyang Hu;L. Tian;Hui Hu
中科院分区：
文献类型：
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作者：
Haiyang Hu;L. Tian;Hui Hu
针对航空发动机结冰现象，进行了一项实验研究，研究了空气中微小冰粒/冰晶撞击加热测试表面时的动态冰积过程。实验研究是在专门设计的冰晶结冰试验装置中进行的，目的是在冷冻气流中产生并注入微细冰粒。这些微小的冰粒被强迫撞击到表面温度可控的加热测试板上。当冰颗粒撞击到被加热的试验表面时，在被加热表面上发生了三个不同的阶段：1)开始的融冰阶段，然后2)冰/水混合物形成阶段，然后3)水再冻结阶段，最终在被加热的试验表面上形成了固体冰层。在撞击测试板后，球形的小冰粒更容易从测试表面反弹，而非球形的大冰粒则经历了灾难性的破碎过程，破碎成更小的碎片，在测试表面留下了明显的撞击残留物。由于被撞击的冰粒融化，在测试表面形成液态水膜层，这非常有利于使更多的被撞击的冰粒停留在测试表面，导致被加热的测试表面上积聚的水/冰层迅速增长。对冰的动态吸积过程中的非定常换热特性进行了全面的理论分析。理论预测的碰撞冰粒在加热试验表面的收集效率和融冰初期水层温度变化与实验测量结果吻合较好。
An experimental study was conducted to examine the dynamic ice accretion process upon the impingement of microsized, airborne ice particles/crystals onto a heated test surface pertinent to aeroengine icing phenomena. The experimental study was conducted in a specially designed ice crystal icing test facility to generate and inject microsized ice particles into a frozen-cold airflow. The microsized ice particles were forced to impinge onto a heated test plate with controllable surface temperatures. Upon impingement of the ice particles onto the heated test surface, the dynamic ice accretion process was found to take place over the heated surface in three distinct stages: 1) an ice-melting stage at the beginning, followed by 2) an ice/water mixture formation stage, and then 3) a water refreezing stage, causing the formation of a solid ice layer accreted on the heated test surface eventually. After impinging onto the test plate, while small ice particles with spheric shapes were found to be more ready to bounce off from the test surface, large, nonspheric-shaped ice particles experienced a catastrophic fragmentation process and break up into smaller pieces with noticeable impingement residues remaining on the test surface. The formation of a liquid water film layer on the test surface due to the melting of the impinged ice particles was found to be very beneficial to make more impinged ice particles stay sticking on the test surface, resulting in a rapid growth of the water/ice layer accreted on the heated test surface. A comprehensive theoretical analysis was also performed to examine the unsteady heat transfer characteristics during the dynamic ice accretion process. The theoretic predictions of the collection efficiency of the impinged ice particles on the heated test surface and the temperature variations of the water layer at the initial ice-melting stage were found to agree well with the experimental measurement results.