Publication detail

Design of the blisk of an aircraft turbojet engine and verification of its resonance free operation

English title

Design of the blisk of an aircraft turbojet engine and verification of its resonance free operation

Type

journal article - other

Language

en

Original 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 brněnská́ strojírna (PBS) Velká́ 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 Velká́ Bíteš.

English 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 brněnská́ strojírna (PBS) Velká́ 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 Velká́ Bíteš.

Keywords in English

jet engine, blisk, critical speed, experimental modal analysis, resonance

Released

30.07.2016

Publisher

TYPOS, Ltd., Podnikatelská 14, 320 59 Plzeň

Location

Plzeň

ISSN

1802-680X

Volume

1

Number

10

Pages from–to

5–14

Pages count

10

BIBTEX


@article{BUT127636,
  author="Lukáš {Chromek},
  title="Design of the blisk of an aircraft turbojet engine and verification of its resonance free operation",
  year="2016",
  volume="1",
  number="10",
  month="July",
  pages="5--14",
  publisher="TYPOS, Ltd., Podnikatelská 14, 320 59 Plzeň",
  address="Plzeň",
  issn="1802-680X"
}