Application of gold-plated grating in high temperature dynamic strain measurement for aerospace engines
In the ground hot test or high-altitude simulation test of aerospace engines,it is necessary to accurately measure the dynamic strain parameters of high-temperature pipelines to determine the structural dynamic strength and mechanical properties of key high-temperature pipelines,which is of great significance for studying the performance and safety characteristics of engines.According to the measurement requirements of high-temperature dynamic strain,Xi'an Aerospace Propulsion Institute proposes to use femtosecond laser engraved fiber Bragg gratings coated with gold for high-temperature dynamic strain measurement.Through high-temperature characteristic tests,temperature compensation technology research was carried out,and a high-temperature strain temperature compensation scheme was clarified.The accuracy of high-temperature strain measurement and the feasibility of temperature compensation scheme were verified on high-temperature equal strength beam.The results show that the strain measurement error is within the range of±5×10-5 after high-temperature temperature compensation,which can meet the accuracy requirements of high-temperature dynamic strain measurement for aerospace liquid engines.The high-temperature strain technology with fiber has been well applied in the measurement of high-temperature dynamic strain during hot testing of multiple engine models designed by our research institute.It has the characteristics of low measurement cost and high measurement accuracy,and can accurately measure the high-temperature dynamic strain of pipeline working wall temperature within the range of 300-800℃.
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维普
