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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flame-sprayed coatings as de-icing elements for fiber-reinforced polymer composite structures: Modeling and experimentation
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Flame-sprayed coatings as de-icing elements for fiber-reinforced polymer composite structures: Modeling and experimentation

机译：火焰喷涂涂料作为纤维增强聚合物复合结构的除冰元素：建模和实验

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摘要

The development of embedded de-icing elements for polymer-based composite materials, coupled with mathematical models that describe their performance, is of interest to the aerospace, communications, and energy industries. Nickel-chromium-aluminum-yttrium (NiCrAlY) coatings were deposited on to fiber-reinforced polymer composite (FRPC) plates by using a flame spraying process. Electric current was supplied to the metal alloy coatings to generate energy by way of Joule heating (or resistive heating) and to enable the coatings to act as heating elements for the FRPC structures. De-icing tests were performed at ambient temperatures of -5 ℃, -15 ℃, and -25 ℃, after liquid water was sprayed on the samples. Heat transfer models were developed to predict the heating and melting times of the ice during the de-icing process with the flame-sprayed coatings. The models were based on the separation of variables method for a finite length-scale melting problem and Stefan's problem applied to a semi-infinite medium. It was found that a coating that was on the order of 100 μm thick was effective for melting accumulated ice on polymer composite structures that were exposed to cold environments. The results of the finite length-scale model and its agreement with experimental data suggest that a heat conduction model based on the separation of variables method may be applied to free boundary problems to predict phase change phenomena induced by thermal-sprayed coatings.
机译：用于聚合物基复合材料的嵌入式除冰元件的开发，以及描述其性能的数学模型，是航空航天，通信和能源行业感兴趣的。镍铬铝钇（NiCrAlY）涂层通过火焰喷涂工艺沉积到纤维增强聚合物复合材料（FRPC）板上。电流通过焦耳加热（或电阻加热）提供给金属合金涂层以产生能量，并使涂层能够用作FRPC结构的加热元件。将液态水喷洒到样品上后，在-5℃，-15℃和-25℃的环境温度下进行除冰测试。开发了传热模型，以预测在火焰喷涂涂层除冰过程中冰的加热和融化时间。这些模型基于有限长度尺度熔化问题的变量分离方法，并将Stefan问题应用于半无限介质。已经发现，约100μm厚的涂层对于使暴露于寒冷环境的聚合物复合结构上的积聚的冰融化是有效的。有限长度尺度模型的结果及其与实验数据的一致性表明，基于变量分离方法的热传导模型可以应用于自由边界问题，以预测由热喷涂涂层引起的相变现象。

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