Analysis of Methods for Reducing Power Losses in the Compressor Impeller when Balancing the Turbine Generator Rotor at the Operating Speed

The article considers the problems of performing full-scale tests, including balancing the rotors of the gas turbine engines together with body parts. Since during balancing it is necessary to distance the natural frequency of the oscillatory system as much as possible from the test imbalance frequency, it is recommended to balance at the operating frequencies of the rotor without stator parts forming the flow path of the compressor and turbine stages. Therefore, when testing or balancing, large power is required for performing the work of air ventilation, as well as the work against viscous friction forces. One of the most significant problems is the need to provide significant driving power for a gas dynamic or balancing stand, which imposes strict requirements and complicates its design. Methods of power reduction for balancing the rotor of a gas turbine unit with body parts are proposed. One method, balancing in the technological casing, is considered in more detail. Several variants of such casings have been developed and investigated, for each of them the values of the required power draw have been obtained. The studies were carried out by the mathematical simulation of gas flow processes in the computational domain formed by the impeller and the inner surface of each particular variant of the casing. As a result of the calculated data analysis recommendations significantly speeding up balancing the rotor of a gas turbine unit and reducing the cost have been developed.

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