PSI - Issue 20

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2018) 000–000 Structural Integrity Procedia 00 (2018) 000–000

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ScienceDirect

Procedia Structural Integrity 20 (2019) 284–293

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Calculation methods of diagnostics for tube constructions elements of power equipment destruction Tatiana Fesenko*, Elena Dronova, Lidiya Shitova Federal Budget-funded Institute for Machine Science named after A. Blagonravov of the Russian Academy of Science, 4 Maly Kharitonyevsky Pereulok, Moscow, 101990, Russia 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Calculation methods of diagnostics for tube constructions elements of power equipment destruction Tatiana Fesenko*, Elena Dronova, Lidiya Shitova Federal Budget-funded Institute for Machine Science named after A. Blagonravov of the Russian Academy of Science, 4 Maly Kharitonyevsky Pereulok, Moscow, 101990, Russia The report is devoted to analysis of increasing vibro-reliability of power equipment elements namely heat exchanger and steam generators. According to statistics, power equipment destruction is a result of heat exchanger tubes intense vibrations in tube bundles, as the most loaded elements. Therefore, the problem of mathematical models creation which allow assessment and analysis of hydrodynamic forced vibrations in tube bundles becomes actual. For this, forces acting on the tube bundles in flow and hydrodynamic connections between them are determined. By means of obtained hydrodynamic connections matrices the behavior of tube bundle depending on the velocity of approach flow is studied, the boundary of system transition to an unstable state is determined, i.e. the corresponding values of cross flow critical velocity for different types of tube bundles. Based on obtained hydrodynamic connections matrices amplitude-frequency characteristics for a particular tube bundle were determined. The report is devoted to analysis of increasing vibro-reliability of power equipment elements namely heat exchanger and steam generators. According to statistics, power equipment destruction is a result of heat exchanger tubes intense vibrations in tube bundles, as the most loaded elements. Therefore, the problem of mathematical models creation which allow assessment and analysis of hydrodynamic forced vibrations in tube bundles becomes actual. For this, forces acting on the tube bundles in flow and hydrodynamic connections between them are determined. By means of obtained hydrodynamic connections matrices the behavior of tube bundle depending on the velocity of approach flow is studied, the boundary of system transition to an unstable state is determined, i.e. the corresponding values of cross flow critical velocity for different types of tube bundles. Based on obtained hydrodynamic connections matrices amplitude-frequency characteristics for a particular tube bundle were determined. Abstract Abstract Keywords: mathematical models, tube bundles, cross flow, approach flow, excitation mechanism, dynamic response, frequencies, amplitudes, vibro-reliability. Keywords: mathematical models, tube bundles, cross flow, approach flow, excitation mechanism, dynamic response, frequencies, amplitudes, vibro-reliability. 1. Problem statement From literature analysis it is possible to determine hydrodynamic vibrations excitation basic mechanisms for tube bundles - excitation by periodic vortex separation, which acts in a narrow range of flow velocities and can lead to intense vibrations and hydroelastic excitation, which at the critical flow velocity results to unacceptably high tubes 1. Problem statement From literature analysis it is possible to determine hydrodynamic vibrations excitation basic mechanisms for tube bundles - excitation by periodic vortex separation, which acts in a narrow range of flow velocities and can lead to intense vibrations and hydroelastic excitation, which at the critical flow velocity results to unacceptably high tubes

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 2452-3216 © 2019 The Author(s). Publis ed by lsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers * Corresponding author. Tel.: +7-499-135-3514; fax: +0-000-000-0000 . E-mail address: t-fesenko@yandex.ru * Corresponding author. Tel.: +7-499-135-3514; fax: +0-000-000-0000 . E-mail address: t-fesenko@yandex.ru

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 10.1016/j.prostr.2019.12.153