Title: Design of the blisk of an aircraft turbojet engine and verification of its resonance free operation
Authors: Chromek, Lukáš
Citation: Applied and Computational Mechanics. 2016, vol. 10, no. 1, p. 17-26.
Issue Date: 2016
Publisher: University of West Bohemia
Document type: článek
URI: http://www.kme.zcu.cz/acm/acm/article/view/299
ISSN: 1802-680X (Print)
2336-1182 (Online)
Keywords: tryskové motory;rychlost;experimentální modální analýza;rezonance
Keywords in different language: jet engines;speed;experimental modal analysis;resonance
Abstract: Integral turbine wheels belong to one of the most stressed parts of jet aircraft engines. In addition to high rotational speeds and temperatures, they are also subjected to dynamic forces from a non-uniform pressure field in the flow path. Dynamic forces even at a relatively small amplitude can cause failure by fatigue, which leads to fracture of blades and crash of the machine. These adverse conditions, called resonance, should be avoided already in the design stage when a suitable choice of stator vanes and the number of blades can move the critical speed of the blisk beyond the operating speed or at least reduce their influence. In the case of a small jet engine produced by the První brněnská strojírna (PBS) Velká Bíteš, the operating speed is of nearly half of the entire speed range of the machine. This makes the design of a proposed turbine wheel very complicated. A higher harmonic order of aerodynamic excitation is almost always present, its influence was therefore tested experimentally by vibration tests in the test station PBS Velká Bíteš.
Rights: © 2016 University of West Bohemia. All rights reserved.
Appears in Collections:Volume 10, number 1 (2016)
Volume 10, number 1 (2016)

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Please use this identifier to cite or link to this item: http://hdl.handle.net/11025/21632

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