Thermal State Analysis of the Starter-Generator Installed on the Gas Turbine Engine Rotor Shaft

Aeronautical and Space-Rocket Engineering


Аuthors

Kondryakov A. D.1, 2*, Leontiev M. K.1, 3**

1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. Lyulka Desing Bureau, 13, Kasatkina str., Moscow, 129301, Russia
3. Scientific and technical centre of rotor dynamic «Alfa-Tranzit», 1, Leningradskaya str., Khimky, Moscow region, 141400, Russia

*e-mail: tetra1337@mail.ru
**e-mail: lemk@alfatran.com

Abstract

For the engine new functionality creating and improving its specific characteristics, the priority trend consists in its electrification by mounting the lager, compared to the prototype, size on the starter-generator gearboxes into the inner engine crankcase housing on the high-frequency rotor under conditions of higher temperatures, vibrations and other external disturbances.
A structurally integrated starter-generator with permanent magnets and an external version of rotor has a mixed structure that includes elements made of traditional aviation structural materials and elements peculiar to electrical engineering with appropriate special materials. The optimal location of the electric motor herewith is the engine internal oil casing.
A 3D geometric model of the starter generator mounting in the internal area of a gas turbine engine generator was developed. The authors identified the heat sources, which were the electric motor eigenheat generation, heat exchange with adjacent structural parts, and heating from the engine flow part. CAE models were developed in both flat and sector settings to analyze the thermal state. Parameters of the aviation transmission oil were employed as the working fluid. The assessment was performed herewith for the two cases of the system inlet temperature, depending on the oil system design, namely the initial one with the electric pumps addition and the autonomous one.
Distribution of the Temperature fields across the unit parts and its encirclement was obtained, and the graphs of the oil outlet temperature dependence on its required flow rate were plotted. The following conclusions can be drawn based on the computational results:
1) When electric motors thermal condition computing, It is advisable to run computations in the sector;
2) It is necessary to employ an autonomous oil system to achieve a satisfactory temperature condition, which is possible with synthesis of the critical technology of the third circuit of the adaptive engine with the additional heat exchangers application.
Additionally, it is advisable to consider the application of turbo coolers as a part of the power plant for cooling the circuit of the electrical part.

Keywords:

rotor shaft of a gas turbine engine, electric motors specific indices, the integrated starter-generator design, electric motor with permanent magnets, the starter-generator thermal state

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