Home – Home – Jornals – Avtometriya 2017 number 4

This paper describes the study of temperature in the flowing part of a turbine on the informative parameters (equivalent to the inductance of primary coils of matching transformers) of single-coil eddy current sensors with a sensitive element in the form of a conductor section, which are used as part of automation systems for testing gas turbine engines. In this case, the objects of temperature influences are both sensors and controlled turbine blades. The existing model of electromagnetic interaction of a sensitive element with the end part of a controlled blade is used to obtain quantitative estimates of temperature changes of equivalent inductances of sensitive elements and primary coils of matching transformers. This model is also used to determine the corresponding changes of the informative parameter of the sensor in the process of experimental studies of temperature influences on it (in the absence of blades in the sensitive region). This paper also presents transformations in the form of relationships of informative parameters with radial and axial displacements at normal (20 ºC) and nominal (1000 ºC) temperatures, and their difference is used to determine the families of functions of temperature influences, which characterize possible temperature errors for any radial and axial displacements in the ranges of their variation.