Design and failure analysis of composite blade for flutter measurements

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24220%2F24%3A00012625" target="_blank" >RIV/46747885:24220/24:00012625 - isvavai.cz</a>

Výsledek na webu

<a href="http://www-kme.zcu.cz/download/proceedings/CM2024_Conference_Proceedings.pdf" target="_blank" >http://www-kme.zcu.cz/download/proceedings/CM2024_Conference_Proceedings.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Design and failure analysis of composite blade for flutter measurements

Popis výsledku v původním jazyce

In controlled flutter measurements, the blades are oscillating at high frequencies which induces significant inertial forces in addition to the aerodynamic loads caused by air flow. Current blades are made from steel, which, due to high inertial moments, does not allow oscillations at sufficiently high frequencies to simulate real-world conditions of turbomachines. The goal is to substitute steel blades by ones from carbon fiber - epoxy composite material with low specific density, high stiffness and strength. The blade‘s geometry has been optimized to meet the design requirements for composite materials. The inner structure is determined through topology optimization, followed by an assessment of the blade‘s limits. Computational modal analysis and a quasistatic analysis, including failure analysis, are performed to evaluate the performance of a composite design. Results show a 60 % increase in the first torsional eigenfrequency from 357 Hz for steel to 569 Hz for the composite blade. Additionally, maximum displacement under operating conditions was reduced by nearly 70%, from 1.41 mm for the steel blade to 0.47 mm for the composite. These results demonstrate the feasibility and effectiveness of the composite blade design, suggesting a potential increase in the frequency range for blade flutter testing.

Název v anglickém jazyce

Design and failure analysis of composite blade for flutter measurements

Popis výsledku anglicky

In controlled flutter measurements, the blades are oscillating at high frequencies which induces significant inertial forces in addition to the aerodynamic loads caused by air flow. Current blades are made from steel, which, due to high inertial moments, does not allow oscillations at sufficiently high frequencies to simulate real-world conditions of turbomachines. The goal is to substitute steel blades by ones from carbon fiber - epoxy composite material with low specific density, high stiffness and strength. The blade‘s geometry has been optimized to meet the design requirements for composite materials. The inner structure is determined through topology optimization, followed by an assessment of the blade‘s limits. Computational modal analysis and a quasistatic analysis, including failure analysis, are performed to evaluate the performance of a composite design. Results show a 60 % increase in the first torsional eigenfrequency from 357 Hz for steel to 569 Hz for the composite blade. Additionally, maximum displacement under operating conditions was reduced by nearly 70%, from 1.41 mm for the steel blade to 0.47 mm for the composite. These results demonstrate the feasibility and effectiveness of the composite blade design, suggesting a potential increase in the frequency range for blade flutter testing.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/LUAUS23231" target="_blank" >LUAUS23231: Příčiny a mechanismy vzniku flutteru a nesynchronních vibrací v moderních turbostrojích pracujících v širokém rozsahu pracovních režimů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů