The Study of the Imbalance Value Effect of the Two-Shaft Rotor System Strength while the Gas Turbine Engine Design

Aeronautical and Space-Rocket Engineering


Аuthors

Kuz’min M. V.*, Treshnevskaya A. S.**, Kirsanov A. R.***, Mokhov A. A.****

Lyulka Experimental Design Bureau, branch of the United Engine Corporation – Ufa Engine Industrial Association, 13, Kasatkina str., Moscow, 129301, Russia

*e-mail: maxim.kuzmin@okb.umpo.ru
**e-mail: anna.semenova.lulka@gmail.com
***e-mail: kar3112@yandex.ru
****e-mail: mohov_2006@mail.ru

Abstract

This article presents the results of the external rotor numerical simulation of the double-shaft rotor system installation. Two options of the imbalance, which were realized by the  concentrated mass attached to the first disk, were discussed. The imbalance effect on the rotor natural frequency, the limit rotor speed and on critical frequency were under study. For this purpose computing of natural the rotor frequency and waveforms with the two imbalance options, computation of strength, considering the fracture criteria for the rotor materials, and resonant waveforms computing were performed.
The increased vibrations are the result of the increased loads on the structural elements of the gas turbine engine (GTE), and lead to concomitant damages of the main subassemblies, which is being confirmed as well by such tools of the inventive problem solving theory (TRIZ) as component and functional analysis. The main loads are applied to the supports, which leads to the radial gap increase in the bearings, and as a consequence to the of slot seals generation o the support pressurization systems, and increases the possibility of the rotor blades interaction with the stator.
The world experience of the gas turbine engine demonstrates that the problems solving of the rotor vibrations should begin as early as possible at the earlier stages of engine development, otherwise they will require deep design changes, as well as subtantial time and material costs. Thus, the increased level of vibrations is the main problem in creating the gas turbine engines. Imbalance is one of the causes of increased vibrations.
This article presents the results of several types of computations performed as part of the study of the imbalance impact on the rotor dynamics: the natural frequencies, limit rotor rotational speed and on critical speeds. This, in fact, presents a modal analysis of the rotor with the linear solver of the LS-DYNA software. It allows determining the natural frequency and waveforms, a quasi-static spin of the rotor in the volume field of the centrifugal forces for determining the stress-strain state of the rotor and the limit speed of rotation, as well as the rotor dynamic spin-up with subsequent Fourier expansion of the computation results for resonant frequency determining.

Keywords:

increased level of rotor vibrations, rotor imbalance, values of critical rotation speeds, rotor mass-rigid characteristics, installation of the two-shaft rotor system, analysis of oscillations natural frequencies and shapes, rotor dynamics problems solution, non-linear analysis of rotor dynamics, quasi-static rotor spin-up, determining rotor limit speed fracture criterion by the first main deformations

References

  1.  Al'tshuller G. Find an idea. Introduction to the TRIZ theory of inventive problem solving. Moscow: Al'pina Biznes Buks; 2022. 408 p. (In Russ.).
  2.  Chelomey VN. (ed) Vibrations in engineering: A handbook in 6 volumes. Vol. 5. Measurements and tests. Moscow: Mashinostroenie; 1981. 496 p. (In Russ.).
  3.  Azovtsev YuA, Barkova NA, Gauze AA. Vibration diagnostics of rotary machines and equipment of pulp and paper mills. St. Petersburg: SPbGTURP; 2014. 127 p. (In Russ.).
  4.  Brantsevich PYu. Criteria and algorithms for assessing the technical condition of complex objects in a vibration control system. Materialy II Mezhdunarodnoi konferentsii “Tsifrovaya obrabotka informatsii i upravlenie v chrezvychainykh situatsiyakh” (November 28-30, 2000). Minsk: ITK NAN Belarusi; 2000. Vol. 2. p. 112-117. (In Russ.).
  5.  Balitskii FYa, Genkin MD, Ivanova MA, et al. Scientific and technical progress in mechanical engineering Vol. 25 Modern methods and means of vibration diagnostics of machines and structures. Moscow: MTsNTI; 1990. 114 p. (In Russ.).
  6.  Nikhamkin MSh, Semenov SV, Mekhonoshin GV. Experimental study of vibration damping of a two-shaft rotary system of a gas turbine engine. Fundamental'nye issledovaniya. 2014(11, part 2):280-284. (In Russ.).
  7.  Orlov MA. Fundamentals of classical TRIZ. A practical guide for inventive thinking. 2nd ed. Moscow: Solon-Press; 2006. 432 p. (In Russ.).
  8.  Zubko AI, German GK. A study of a complex vibration diagnostic technique for determining the technical condition of rotary turbine engine systems. Materialy Vserossiiskoi nauchno-tekhnicheskoi konferentsii “Aviadvigateli XXI veka” (November 24-27, 2015). Moscow: TsIAM; 2015. p. 63-69. (In Russ.).
  9.  Zubko AI, Aksenov SP, Zvonarev SL, et al. Creation of a diagnostic model for solving the problem of applying vibration diagnostic control of the dynamics of a two-rotor turbine turbine engine. Turbiny. Nasosy. Sistemy. 2018(3):35-43. (In Russ.).
  10.  Zubko AI. Method of vibration diagnostics of bearing bearings of complex rotary systems of gas turbine engines based on the analysis of high-frequency components of the vibration spectrum. Materialy II Vserossiiskoi nauchno-prakticheskoi konferentsii "Akademicheskie Zhukovskie chteniya” (November 25-27, 2014). Voronezh: VUNTs VVS “VVA”; 2014. Ch. 5. p. 256-264. (In Russ.).
  11.  Avgustovich VG, Shmotin YuN, Sipatov AM, et al. Numerical modeling of unsteady phenomena in gas turbine engines. Moscow: Mashinostroenie; 2005. 523 p. (In Russ.).
  12.  Nazarenko YuB, Potapov AYu. Elimination of critical rotational speeds of gas turbine engine rotors by adjusting the stiffness of the support. Dvigatel'. 2014(1):14-16. (In Russ.).
  13.  Parshikov AN. The numerical SPH method using the fracture decay ratios and its application in the mechanics of deformable heterogeneous media. Dissertation of the Doctor of Physical and Mathematical Sciences, Moscow: JIT RAS; 2013. 202 p. (In Russ.).
  14.  Semenova AS, Gogaev GP. Evaluation of destructive rotation frequency of turbo-machine disks applying deformation criterion with LS-DYNA software. Aerospace MAI Journal. 2018;25(3):134-142. (In Russ.).
  15.  Semenova AS, Kuz’min MV Kirsanov AR. Numerical Modeling of Inter-Rotor Bearing Rotation with Real Operating Conditions Simulation. Aerospace MAI Journal. 2024;31(2):124-132. (In Russ.). URL: https://vestnikmai.ru/eng/publications.php?ID=180655
  16.  LS-DYNA Keyword User’s Manual Volume I. May 2007. Version 971. Livermore Software Technology Corporation (LSTC). 1384 p.
  17.  Tanapornraweekit G, Kulsirikasem W. FEM Simulation of HE Blast-Fragmentation Warhead and the Calculation of Lethal Range. International Journal of Mechanical and Mechatronics Engineering. 2012;6(6):1070-1074. URL: publications.waset.org/6890.pdf
  18.  Semenova AS, Kuz’min MV, Kirsanov AR. The study of rotation frequency of the GTE ceramic segmental bearing internal ring impact on its strength. Aerospace MAI Journal. 2023;30(3):101-108. (In Russ.).
  19.  Ovchinnikov IV, Homjakov AM. Bearing capacity of reaction turbine impeller. Aerospace MAI Journal. 2010;17(3):120-128. (In Russ.).
  20.  Heylen W, Lammens S, Sas P. Modal Analysis Theory and Testing. 2nd ed. Katholieke Universiteit, Belgium. 1998.

mai.ru — informational site of MAI

Copyright © 1994-2025 by MAI