On-Line Temperature Measurement Inside a Thermal Barrier Sensor Coating During Engine Operation
On-Line Temperature Measurement Inside a Thermal Barrier Sensor Coating During Engine Operation
复制标题
发动机运行期间热障传感器涂层内部的在线温度测量
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
A. Heyes
中科院分区：
文献类型：
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作者：
A. Y. Gonzalez;C. Pilgrim;J. Feist;P. Y. Sollazzo;F. Beyrau;A. Heyes
现有的热障涂层（tbc）可以适应增强其功能，这样它们不仅可以保护关键部件免受高温气体的影响，还可以感知其自身的材料温度或其他物理特性。通过在热障陶瓷中嵌入光学活性稀土离子，引入了自传感能力。当被光照射时，材料开始发出磷光，磷光可以根据涂层设计提供有关涂层的温度、相变、腐蚀或侵蚀的原位信息。在线温度检测系统的集成使tbc的全部潜力得以实现，因为它提高了温度测量的准确性和退化的早期预警。这将提高燃油效率，减少二氧化碳排放。本文综述了采用掺镝钇稳定氧化锆（YSZ）作为单层和双层传感器涂层材料在劳斯莱斯喷气发动机上实现的测量系统。分别对燃烧室衬垫上的冷却部件和未冷却部件以及喷嘴导叶（ngv）进行了温度测量。本文研究了这些结果的解释，看看涂层厚度效应和温度梯度在TBC。在这项研究中，一个专门的循环热梯度燃烧器试验台进行了操作，并使用了与发动机试验相同的仪器。这种独特的装置可以在不同的温度下控制涂层的加热。采用长波高温计结合磷光探测器对涂层表面温度进行检测。采用两种方法对发射率的变化进行了校正。使用热电偶连续测量样品的衬底温度。典型的涂层梯度小于1 K/μm。当激发激光穿透涂层时，它在整个涂层的几个位置产生磷光，从而提供一个集成信号。该研究成功地证明了磷光涂层的温度指示在所有操作条件下都保持在表面和衬底温度之间。这证明了在靠近粘结层的涂层内部进行测量的可能性。粘结层温度的知识与热生长氧化物（TGO）的生长有关，TGO与涂层的分层有关，因此决定了其寿命。此外，数据与一维磷光模型有关，该模型确定了激光的穿透深度和发射。
Existing thermal barrier coatings (TBCs) can be adapted enhancing their functionalities such that they not only protect critical components from hot gases but also can sense their own material temperature or other physical properties. The self-sensing capability is introduced by embedding optically active rare earth ions into the thermal barrier ceramic. When illuminated by light, the material starts to phosphoresce and the phosphorescence can provide in situ information on temperature, phase changes, corrosion, or erosion of the coating subject to the coating design. The integration of an on-line temperature detection system enables the full potential of TBCs to be realized due to improved accuracy in temperature measurement and early warning of degradation. This in turn will increase fuel efficiency and will reduce CO2 emissions. This paper reviews the previous implementation of such a measurement system into a Rolls-Royce jet engine using dysprosium doped yttrium-stabilized-zirconia (YSZ) as a single layer and a dual layer sensor coating material. The temperature measurements were carried out on cooled and uncooled components on a combustion chamber liner and on nozzle guide vanes (NGVs), respectively. The paper investigates the interpretation of those results looking at coating thickness effects and temperature gradients across the TBC. For the study, a specialized cyclic thermal gradient burner test rig was operated and instrumented using equivalent instrumentation to that used for the engine test. This unique rig enables the controlled heating of the coatings at different temperature regimes. A long-wavelength pyrometer was employed detecting the surface temperature of the coating in combination with the phosphorescence detector. A correction was applied to compensate for changes in emissivity using two methods. A thermocouple was used continuously measuring the substrate temperature of the sample. Typical gradients across the coating are less than 1 K/μm. As the excitation laser penetrates the coating, it generates phosphorescence from several locations throughout the coating and hence provides an integrated signal. The study successfully proved that the temperature indication from the phosphorescence coating remains between the surface and substrate temperature for all operating conditions. This demonstrates the possibility to measure inside the coating closer to the bond coat. The knowledge of the bond coat temperature is relevant to the growth of the thermally grown oxide (TGO) which is linked to the delamination of the coating and hence determines its life. Further, the data are related to a one-dimensional phosphorescence model determining the penetration depth of the laser and the emission.
瞬态燃烧中的热成像磷测温：传热和精度的理论研究
DOI：
10.1016/j.proci.2012.05.022
发表时间：
2013
期刊：
影响因子：
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作者：
Atakan;Roskosch;Dennis
通讯作者：
Dennis