«Onshore and offshore oil and gas well construction»

Diagnostics of a gas turbine engine by thermodynamic parameters

UDC: 62-91:62-13:62-97
DOI: 10.33285/0130-3872-2022-10(358)-12-18

Authors:

¹ Kuban State Technological University, Krasnodar, Russia

Keywords: parameters of the gas path of a gas turbine engine, diagnostics of the technical state, trends in the change of dimensionless diagnostic parameters

Annotation:

Diagnostics of a gas turbine engine by measuring the gas path parameters and direct statistical analysis of these values is not very effective due to the fact that these parameters directly depend on the engine operational mode. At the same time, the operational mode of the axial compressor and turbine is mainly associated with a change of the shaft rotational frequency (or the internal and external shafts, in case of a two- or three-shaftscheme). In this case, there occurs a change of the gas flow mode (mass flow and, as a result, temperatures at the compressor compression stages and turbine throttling). Even in the presence of pressure and temperature sensors in the immediate vicinity of the rapidly rotating impellers, the relationship of the parameters taken from them (their dependence on the mode) greatly limits the data processing reliability. The batch addition to the vibration sensor data of the measurement information only complicates the statistical analysis without increasing the reliability of the conclusions about the technical state of the gas turbine engine. At the same time, mathematical modeling methods are of particular relevance, since as a result of calculations they make it possible to find parameters that are not directly measured, but are important for assessing the state of the engine. These diagnostic parameters – dimensionless, slightly changing with a not too significant change in the operational mode – allow making conclusions about a change in the state of a gas turbine engine based on systematic changes during a long-term operation (trends).

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