Liu Zhenxia, Zhao Ziyu, Lyu Yaguo, Zhao Lingqiang
School of Power and Energy, Northwestern Polytechnical University, Youyi West Road 127#, Xi'an 710054, China.
Sensors (Basel). 2019 Aug 25;19(17):3694. doi: 10.3390/s19173694.
Turbine tip clearance of aero-engine is important to engine performance. Proper tip clearance can reduce the gas leakage over turbine blade tips and improve the engine efficiency of turbo machinery and reduce the fuel consumption. Therefore, accurate tip clearance measurement is essential. The inductive measurement method is one of the non-contact distance measurement methods, which has the characteristics of high sensitivity, fast response speed, and strong anti-interference ability. Based on the principle of inductive sensor measuring tip clearance, the ambient temperature change may cause the material electromagnetic performance change for the conductivity and permeability varies with temperature. In order to verify the temperature effect on the sensor performance, the repeated calibration experiments were carried out to obtain the sensor repeatability error of 5.4%. Then, the sensor was calibrated in the range of 0mm-4mm clearance at temperature from 600 °C to 1000 °C and obtained the measurement error of 4.6%. Results indicate when the temperature ranged from 600 °C to 1000 °C, clearance measurement error is smaller than the sensor repeatability error so the temperature effect on the sensor characteristics can be ignored. This conclusion makes the sensor promising for monitoring the blade tip clearances at various temperature environment.
航空发动机的涡轮叶尖间隙对发动机性能至关重要。合适的叶尖间隙可以减少涡轮叶片叶尖处的气体泄漏，提高涡轮机械的发动机效率并降低燃油消耗。因此，精确测量叶尖间隙至关重要。电感测量方法是一种非接触式距离测量方法，具有灵敏度高、响应速度快和抗干扰能力强的特点。基于电感式传感器测量叶尖间隙的原理，环境温度变化可能会导致材料的电磁性能发生变化，因为电导率和磁导率会随温度变化。为了验证温度对传感器性能的影响，进行了多次校准实验，得到传感器的重复性误差为5.4%。然后，在600℃至1000℃的温度范围内，对间隙在0mm - 4mm的传感器进行校准，得到测量误差为4.6%。结果表明，当温度在600℃至1000℃范围内时，间隙测量误差小于传感器重复性误差，因此温度对传感器特性的影响可以忽略不计。这一结论使得该传感器在监测各种温度环境下的叶片叶尖间隙方面具有广阔前景。
