燃气轮机无冷却高温受感部设计及应用

Design and Application of Uncooled High Temperature Probe of Gas Turbine

针对某型燃气轮机低排放燃烧室出口温度场测量无法采用常规气冷受感部的实际问题,基于高温陶瓷复合材料设计并应用了一种无冷却高温受感部。通过对高温陶瓷复合材料进行力学性能试验、氧化规律试验,首次将该材料应用于受感部主要承力部件,降低了设计及装配复杂度,避免了在试验过程中引入冷却介质、过多占用台架资源的问题,同时通过“内埋”式屏蔽罩设计提高了受感部的测试精度,计算结果表明:受感部的综合误差满足±1%的测试精度要求。燃烧室温度场测量试验结果表明:高温陶瓷复合材料能够在1200℃以上的高温环境下作为受感部主要承力部件使用,且温度数据变化情况与试验状态变化情况一致,能够反映燃烧室出口温度分布规律。

To solve the problem of the unadopted conventional air-cooled probe to measure the outlet temperature of a gas turbine lowemission combustor during rig test,an uncooled high temperature probe based on high temperature ceramic composites was designed and applied.Through the test analysis of the mechanical properties and oxidation law of high temperature ceramic composites,the material was applied to the main load-bearing component of the probe for the first time.This new design reduced the complexity of the probe,avoided utilizing coolant and occupying testing resources,and improved the measurement accuracy through the introduction of embedded shields.The calculation results show that the total error of the probe meets the requirement of±1%.The test results show that high temperature ce⁃ramic composites can be used as the main load-bearing component at a high temperature above 1200℃.The measuring results varied con⁃sistently with the test states,which can represent the temperature distribution law of the combustor outlet.