Sensors: Temperature and Heat Flux Sensor for Gas Turbine Coatings

传感器：用于燃气轮机涂层的温度和热通量传感器

• 批准号: 0428941
• 负责人: David Clarke
• 金额: $ 37.5万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-15 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0428941&HistoricalAwards=false
• 关键词: Sensors; Temperature; Heat; Flux; Sensor

This proposal was received in response to the Sensors and Sensor Networks Solicitation, NSF 04-522, category Individual Investigator Proposals.Society today relies on gas turbine engines for both the generation of electricity and aircraft propulsion. To increase the overall energy efficiency as well as minimize maintenance, there is a drive to develop new coatings, sensors and controls. The focus of our research is on high-temperature thermal barrier coatings that provide thermal insulation to the turbine blades and combustion chambers allowing engines to be operated at higher temperatures, and hence higher efficiency, than uncoated engines. Specifically, we are developing an all-optical sensor for in-situ measurement of the temperature, and heat flux, across thermal barrier coatings, crucial heat transfer parameters for both "health monitoring" and design validation as well as reliability and life prediction. As the life of the coating, the metal blades and vanes all depend on their maximum temperature, the temperature of the inner coating surface, which is in direct contact with the metal, is a vital but presently unknowable parameter. Likewise, the actual temperature of the coatings' outer surface, as distinct from the gas temperature at the surface, also affects coating life and durability. With measurements of the temperature difference across the thickness of the coating the heat flux can be determined.The basis of our proposed sensor is the characteristic temperature-dependent luminescence from different rare-earth dopants that we incorporate within the crystal structure of existing thermal barrier coating materials. By placing the dopants at different levels in the coating it becomes a structured sensor whose signals come from the positions within the coating where the dopants are located, for instance at the inner and outer surfaces. Although the focus is on temperature measurement in thermal barrier coatings, the methodology, the protocols for selecting of dopants for high-temperature luminescence and the overall sensor design considerations are expected to be of value for other applications where it is important to measure high temperatures of materials and, in particular within structures of materials where optical pyrometer is not feasible or masked by thermal radiation.An integral part of the program is that the graduate students will perform tests of the sensors at NASA Glenn Research Center using the laser-driven high heat flux test rig there, enabling them to also experience a different working environment and learning from research professionals and collaborators.The proposal is being funded by the Thermal Transport and Thermal Processing Program of the Chemical and Transport Systems Division and the Sensors in Civil and Mechanical Systems Program in the Civil and Mechanical Systems Division.

该提案是根据传感器和传感器网络招标的响应，NSF 04-522，类别个体研究者的建议。社会今天依靠燃气轮机发动机来产生电力和飞机推进。为了提高整体能源效率并最大程度地减少维护，有开发新涂料，传感器和控制的动力。我们研究的重点是高温热屏障涂层，这些涂层可为涡轮叶片和燃烧室提供热隔热材料，使发动机可以在更高的温度下进行操作，因此比未涂层的发动机可以在更高的温度下进行操作，从而使发动机更高。具体而言，我们正在开发一个全光传感器，用于跨热屏障涂层的温度和热通量的原位测量，“健康监测”以及设计验证以及可靠性和生活预测的关键传热参数。随着涂层的寿命，金属叶片和叶片都取决于它们的最高温度，即与金属直接接触的内涂层的温度是至关重要但目前不可知的参数。 同样，涂料外表面的实际温度与表面的气温不同，也影响涂层寿命和耐用性。通过测量在涂层的整个涂层厚度上的温度差，可以确定热通量。我们提出的传感器的基础是我们在现有的热屏障涂料材料的晶体结构中结合的不同稀土掺杂剂的特征温度依赖性发光。通过将掺杂剂放置在涂层中的不同级别上，它将成为一个结构化传感器，其信号来自涂料中掺杂剂所在的位置（例如在内部和外表面）的位置。尽管重点是在热屏障涂层中的温度测量上，但该方法，选择高温发光的掺杂剂的协议和整体传感器设计考虑因素对于其他应用对于材料的高温和材料的高温测试中的材料的高温测试而在材料中不可行或掩盖均值偏离的材料的测试中，这是有价值的。 NASA Glenn研究中心的传感器使用激光驱动的高热量测试钻机，使他们还可以体验不同的工作环境，并向研究专业人员和合作者学习。该提案是由化学和运输系统部的热运输和热处理计划以及民用和机械系统部门中的传感器计划提供的。