| 高温热端部件表面温度测量的系统设计 |
| System design for surface temperature measurement of high temperature hot end components |
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| 中文摘要: |
| 随着燃气涡轮机的不断改进，其叶片温度越来越接近材料的耐温极限，但目前市面上的测温仪器并不能较精确地反映叶片温度和分布，为解决此问题，设计扫描式辐射测温系统，该系统工作时探针安装在发动机外壳上，对准叶片表面，叶片散发的红外辐射经由探针前端的反光镜反射进入探针中，通过探针尾部的光纤传入控制器中，对其光信号进行处理，转化为温度值。通过对扫描探针进行流场与温度场耦合仿真，结果表明：在以0.1 kg/s的流量通入25 ℃冷却气，且探针探测时间不超过15 s的情况下，整个探针内部可在发动机内被有效的保护；探针端部流体压强约17.0 MPa，大大高于燃气的压强1.4 MPa，故表明此区域可以将高温燃气隔绝在外，使其不进入探针内部接触反光镜。在实验室开展实验对该系统进行验证，结果表明：探针在各个温度点的重复性和稳定性均不超过7.5 ℃，该测温系统可以满足涡轮叶片表面温度测温的使用需求。 |
| 英文摘要: |
| With the continuous improvement of gas turbine, its blade temperature is getting closer to the temperature tolerance limit of materials. However, the current temperature measuring instruments on the market cannot accurately reflect the blade temperature and distribution. To solve this problem, a scanning radiation temperature measuring system is designed. When the system is working, the probe is installed on the engine casing and aimed at the surface of the blade. The infrared radiation emitted by the blade is reflected by the reflector at the front end of the probe and enters the probe. It is transmitted to the controller through the optical fiber at the end of the probe, and the optical signal is processed and converted into a temperature value. Through the coupling simulation of the flow field and the temperature field of the scanning probe, the results show that the whole probe can be effectively protected in the engine when 25 ℃ cooling gas is introduced at a flow rate of 0.1 kg/s and the probe detection time is not more than 15 s; the fluid pressure at the end of the probe is about 17.0 MPa, which is much higher than the gas pressure of 1.4 MPa, so this area can isolate the high-temperature gas to prevent it from entering the probe and contacting the reflector. Experiments were carried out in the laboratory to verify the system. The results showed that the repeatability and stability of the probe at each temperature point did not exceed 7.5 ℃,that the temperature measurement system can meet the needs of turbine blade surface temperature measurement. |
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| 中文关键词: 扫描式辐射测温系统 扫描探针 仿真 |
| 英文关键词:scanning radiation temperature measurement system scanning probe simulation |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2022.06.08 |
| 引用本文：胡玮宸, 张学聪, 董磊, 蔡静.高温热端部件表面温度测量的系统设计[J].计测技术,2022,(6):. |
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