ANALYSIS OF THE IMPACT OF SPECIAL CONSTRUCTIONS OF GAP SEALS ON THE DYNAMICS OF CENTRIFUGAL MACHINES

Serhii Shevchenko

doi:10.21303/2313-8416.2020.001485

Serhii Shevchenko Institute for Modeling Problems in Power Engineering G. E. Pukhova NAS of Ukraine http://orcid.org/0000-0002-5425-9259

DOI: https://doi.org/10.21303/2313-8416.2020.001485

Аннотация

The object of research: the influence of the design features of special gap seals on the dynamic characteristics of centrifugal machines.

Investigated problem: harmonization of the consumption and dynamic characteristics of the seals of the rotors of high-speed machines by applying special design methods.

Main scientific results: The mechanism and operating conditions of seals with floating rings are described. It is determined that the most effective from the point of view of dynamic characteristics is the variant of the semi-movable ring. Expressions for determining the conditions of angular and radial immobility of a floating ring are obtained. The design options for deformable gap seals, including deformable floating rings, deformable interwheel seals and seals with an axially movable deformable sleeve, have been investigated. The scope of their application for unique machines with high requirements for tightness and vibration reliability has been determined. Variants of the design of labyrinth seals have been investigated. The analysis shows that the dynamic properties of labyrinth seals significantly depend on the relative position of the ridges. Overlapping ridged seals have the worst dynamic performance of the labyrinth seal designs. The honeycomb seal has more favorable dynamic properties, and the well seal has the best combination of consumption and dynamic characteristics. The dynamic characteristics are especially important for the seals of high-speed rotors of centrifugal machines.

The area of practical use of the research results: Enterprises that manufacture centrifugal machines: pumps and compressors.

Innovative technological product: a methodology for the selection, design and calculation of special designs of gap seals with optimization of dynamic and flow characteristics.

Scope of application of the innovative technological product: The obtained research results will be useful in the design and manufacture of centrifugal pumps and compressors for any parameters.

Скачивания

Данные скачивания пока недоступны.

Биография автора

Serhii Shevchenko, Institute for Modeling Problems in Power Engineering G. E. Pukhova NAS of Ukraine

Department of Energy Modeling

Литература

Martsinkovskii, V. A., Shevchenko, S. S.; Shevchenko, S. S. (Ed.) (2018). Nasosy atomnykh elektrostantsii: raschet, konstruirovanie, ekspluatatsiia. Sumy: Universitetskaia kniga, 472.

Martsynkovskyi, V. A. (1980). Beskontaktnie uplotnenyia rotornikh mashyn. Moscow: Mashynostroenye, 200.

Kim, S. H., Ha, T. W. (2016). Prediction of leakage and rotordynamic coefficients for the circumferential-groove-pump seal using CFD analysis. Journal of Mechanical Science and Technology, 30 (5), 2037–2043. doi: http://doi.org/10.1007/s12206-016-0410-4

Vijaykumar, A., Morrison, G. (2010). Numerical Simulation of the Flow Field in a Statically and Dynamically Eccentric Annular Seal With Non-Circular Whirl Orbits. ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C, 731–761. doi: http://doi.org/10.1115/fedsm-icnmm2010-30839

Wang, J., Shen, H. P., Ye, X. Y., Hu, J. N., Feng, Y. N. (2013). The influence of annular seal clearance to the critical speed of the multistage pump. IOP Conference Series: Materials Science and Engineering, 52 (2), 022034. doi: http://doi.org/10.1088/1757-899x/52/2/022034

Bojko, M., Kozubkova, M., Kozdera, M., Zavila, O. (2014). Investigation of the influence of radial grooves on the flow in an eccentrically deposited annulus using CFD numerical simulation. EPJ Web of Conferences, 67, 02009. doi: http://doi.org/10.1051/epjconf/20146702009

Badun, O. P., Deshevykh, S. A., Ivanov, Ia. N. (2016). Osobennosti ispolzovaniia plavaiuschikh kolets v kislorodnykh nasosakh. Vestnik dvigatelestroeniia, 2, 115–121.

Suleimanov, R. I., Nazarov, V. P. (2011). Analiz vozmozhnosti primeneniia schelevogo uplotneniia rotora TNA s deformiruemoi vtulkoi. Aktualnye problemy aviatsii i kosmonavtiki, 7, 66–67.

Martsinkovskii, V. A., Gulii, A. N., Melnik, V. A. (1988). A. s. 1372138. Uplotnenie vala.

Makarov, A., Zaytsev, N. (2015). Engineering and theoretical problems of labyrinth seals application in high-speed rotor machines. Perm National Research Polytechnic University Aerospace Engineering Bulletin, 42, 61–81. doi: http://doi.org/10.15593/2224-9982/2015.42.05

GAO, R. (2012). Computational Fluid Dynamic and Rotordynamic Study on the Labyrinth Seal. Ph.D. Dissertation in Mechanical Enginee-ring. Virginia Polytechnic Institute and State University.

Martsinkovskii, V. S., Kukharev, I. E., Bilyk, Ia. I., Lazarenko, A. D. (2016). Resheniia problem germetizatsii protochnogo trakta tsentrobezhnogo kompressora. Kompressornoe i energeticheskoe mashinostroenie, 4, 5–14.