10.14489/td.2017.02.pp.048-052

2017, 02 February

DOI: 10.14489/td.2017.02.pp.048-052

Posadov V. V.(jr.), Posadov V. V., Bagrov S. V.
TESTING THE ELASTIC AND MASS CHARACTERISTICS OF A GAS TURBINE ENGINE BLADE RING IN ORDER TO INCREASE THE TOLERANCE TO FLUTTER
(pp. 48-52)

Abstract. One of well-known ways to improve efficiency of modern gas turbine engines is weight reduction. It degrades structural damping and increases the risk of flutter. Flutter causes high vibrating stress in parts and modules of gas turbine engine. It can result in destruction of blades. Usually flutter onsets on first stages of axial compressors. Further improvement of economical and fuel efficiency of modern gas turbine engines requires to use all flutter stability improvement reserves of blades, including inspection of their elastic and mass parameters. Usually during kitting-up the blades engineers use pattern methods where mass properties (i.e. weight and static moment) are used to draw blades from a pool. Blades are installed taking into account one parameter – to obtain unbalance level with accordance with design documentation. This approach allows keeping low vibration level in operation of gas turbine engine and defines broad applicability of these pattern methods. At the same time, these methods do not consider fundamental frequencies of blades at the most dangerous oscillation modes. It can lead to onset of flutter of gas turbine engine compressor. This paper presents impeller blades kitting-up method based on research of relation between impeller’s blade stiffness variation and impeller’s insensitivity to flutter. This method increases insensibility to flutter and provides minimal imbalance according to design documentation. Blades kitting-up is performed using integrated criterion that includes elastic and mass properties of impeller.

Keywords: inspecting of elastic and mass characteristics, blades kitting-up, static moment, stability, oscillations frequency.

+ - About the Authors Click to collapse

V. V. Posadov (jr.), V. V. Posadov, S. V. Bagrov (PJSC “NPO Saturn”, Rybinsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

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