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15 November 2011Turbine blade tip clearance measurements using skewed dual optical beams of tip timing
Optimization and active control of the clearance between turbine blades and case of the engine is identified, especially in
aerospace community, as a key technology to increase engine efficiency, reduce fuel consumption and emissions and
increase service life .However, the tip clearance varies during different operating conditions. Thus a reliable non-contact
and online detection system is essential and ultimately used to close the tip clearance control loop. This paper described a
fiber optical clearance measuring system applying skewed dual optical beams to detect the traverse time of passing
blades. Two beams were specially designed with an outward angle of 18 degree and the beam spot diameters are less
than 100μm within 0-4mm working range to achieve high signal-to-noise and high sensitivity. It could be theoretically
analyzed that the measuring accuracy is not compromised by degradation of signal intensity caused by any number of
environmental conditions such as light source instability, contamination and blade tip imperfection. Experimental tests
were undertaken to achieve a high resolution of 10μm in the rotational speed range 2000-18000RPM and a measurement
accuracy of 15μm, indicating that the system is capable of providing accurate and reliable data for active clearance
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De-chao Ye, Fa-jie Duan, Hao-tian Guo, Yangzong Li, Kai Wang, "Turbine blade tip clearance measurements using skewed dual optical beams of tip timing," Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83210W (15 November 2011); https://doi.org/10.1117/12.903907