燃气轮机叶片叶尖间隙光纤测量系统设计

Design of Gas Blade Tip Clearance Measurement System Based on Optical Fiber Sensor

燃气轮机转子叶尖间隙对发动机性能有重要影响,为实现其精密测量,首先,根据光纤对光强耦合原理得到了双圈同轴光纤束的光强调制特性函数;接着,分析了倾角变化对反射式光纤位移传感器测量特性的影响;然后,完成了间隙测量系统设计;最后,通过静态测量实验和不同转速下的动态测量实验验证了所设计系统的性能;实验结果表明:所设计传感器线性测量范围为2mm,测量系统动态性能较好。

In order to meet the measurement requirements of gas turbine tip clearance,the two-circle reflective coaxial fiber probe was designed.First,an output function of the fiber sensor was gained based on light intensity coupling principle analysis.Second,the effect of angle of inclination on reflective optical fiber displacement sensor characteristics is analyzed.Then,the tip clearance measurement system was designed.Finally,the static and dynamic measurement experiments were completed.The results show：sensor designed linear measurement range is 2mm,and the dynamic performance of measurement system designed meet the requirements well.