摘要
在先进燃气轮机技术领域,具有半透明辐射特性的高温热防护涂层被广泛应用以降低高温环境下金属部件的温度。以具有氧化锆涂层的燃气轮机热端金属表面为研究对象,基于半透明涂层的多波段吸收和散射特性谱带模型,采用蒙特卡罗法和控制容积法对半透明涂层内部的辐射-导热耦合传热进行模拟计算,获得了涂层内部的温度场分布规律,进一步研究了不同光谱波段、散射特性以及涂层厚度变化对涂层表观辐射特性的影响。为特定响应波段内的辐射温度与热流测量提供基础的应用数据。
Thermal barrier coatings are widely used to reduce the temperature of the metal parts applied in advanced gas turbine.Spectral radiation characteristics of coating surface are necessary to realize accurate non-contact temperature measurements and radiation flux evaluation.Zirconia ceramics described with 4-band spectral band model of absorbing and scatting properties was used as coating material of metal vane.Coupled radiative and conductive heat transfers in the coatings were numerically calculated by Monte Carlo and control-volume method,to obtain the temperature distributions within the coating.Based on the results,the distributions of spectral radiation characteristics of thermal barrier coating and some relative factors,including the spectral bands,scatting properties,coating thickness and angle,were investigated.The analyses may provide an accurate basic data of spectral radiation characteristics of high-temperature translucent coatings for temperature and radiation flux measurements.
出处
《热科学与技术》
CAS
CSCD
2010年第3期225-231,共7页
Journal of Thermal Science and Technology
基金
国家863高技术研究发展计划资助项目(2007AA04Z178)
国家自然科学基金资助项目(50606033)
关键词
热防护涂层
辐射特性
耦合传热
温度
thermal barrier coatings
radiation characteristics
coupled heat transfer
temperature
