Abstract
Object of research: degradation processes occurring in the blades of a gas-pumping unit (GPU) during its long-term operation and cause the appearance of defects that lead to a change in their technical condition and breakage of the working blades and, as a result, to accidents.
 Solved problem: obtaining a method for diagnosing the GPU blades, which can be used to determine its technical condition during the GPU operation.
 The main scientific results: a classification of methods for diagnosing the GPU blades and their analysis was developed, according to the results of which it was established that the improvement of a new method of aerodynamic calculation of profiles relative to the GPU blades by developing mathematical models of the deformation process and flow around the GPU blades and calculation formulas for assessing their aerodynamic characteristics, will allow to simulate possible options for changing the technical state of the blades (the amount of wear of the blades, their number, deformation, etc.), to study their influence on the parameters of the oscillatory processes of the blades and to compile a dictionary (base) of diagnostic signs of their state. The use of such a base will make it possible to quickly determine the technical condition of the blades during the GPU operation and prevent the occurrence of emergency situations
 The area of practical use of the research results: the enterprises of the gas transmission system, which operate GPU with a gas turbine drive
 An innovative technological product: a method of direct aerodynamic calculation of airfoils relative to GPU blades to determine their technical condition during operation.
 Scope of application of the innovative technological product: gas-pumping units with a gas turbine drive with a capacity of 6.3 MW to 25.0 MW
Highlights
Object of research: degradation processes occurring in the blades of a gas-pumping unit (GPU) during its long-term operation and cause the appearance of defects that lead to a change in their technical condition and breakage of the working blades and, as a result, to accidents
The results of the analysis of methods for diagnosing the technical state of the GPU blades, classified into three groups, show – diagnostic methods of the first group cannot be used for determination of the technical condition of the GPU blades during its operation due to the significant complexity of the installation of the root and peripheral sensors, their comparison with the geometric position of a particular blade in the wheel at certain times and the corresponding interpretation of the obtained values in the field of mechanical stresses and deformations;
– diagnostic methods of the second group are overwhelmingly based on dynamic models of gas turbine engines (GTE), modeling and processing of signals generated by a model of an impeller with defect-free blades and one blade with a crack, etc
Summary
The object of research The object of research is the degradation processes occurring in blades of a gas pumping unit (GPU) during its long-term operation and cause the appearance of defects that lead to a change in their technical condition and breakage of the working blades and, as a consequence, to accidents. Problem description Long-term operation of the gas transmission system of Ukraine (about 40 years) has led to the fact that more than 70 % of gas pumping units (GPU) with a gas turbine drive have almost exhausted their resource (100 thousand hours). The statistics of failures of the main parts of the GPU over a long period shows that the blades accounts for up to 40 % of all GPU failures
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