汽轮机转子表面温度测量的模拟试验研究

Simulation Investigation on Surface Temperature Measurement of Steam Turbine Rotors

汽轮机转子表面温度是对其进行高温蠕变损伤分析及转子热应力、热疲劳分析的关键数据之一,为解决精确测量汽轮机转子表面温度的难题,通过理论与试验相结合研究了热电偶和光纤等接触式测量、红外辐射式非接触测量等不同方法的特点,及转子旋转、振动对红外方式测温的影响.结果表明:采用传统热电偶等接触式方式测量转子表面温度存在响应时间长、信号引出困难等固有缺陷;红外测温响应速度快,能够在一定程度上较准确地测量汽轮机转子的表面温度并且能长期对转子表面温度进行在线监测,转子的旋转及振动对红外测温系统影响很小.

Surface temperature of turbine rotor is one of the key parameters to analyze its high temperature creep,thermal stress and thermal fatigue properties.In order to improve the precision of temperature measurement,simulation investigation has been performed to study the features of contacted（thermocouple and optic fiber） and non-contact（infrared radiation thermometer） temperature measurement method,and analyze the influence of rotor rotation vibration on measurement of infrared radiation thermometer,in both theoretical and experimental way.Results show that,the traditional contact measurement method（thermocouple） has inherent deficiencies such as the long response time and the difficulty to derive the signal,while the infrared method is fast in response,precise in measurement,and capable of realizing long-term on-line monitoring of surface temperature measurement.The infrared method is slightly affected by rotation and vibration of rotor.