Enhanced flutter test rig for a transonic flow in a linear turbine blade cascade and numerical data validation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49193864%3A_____%2F23%3AN0000004" target="_blank" >RIV/49193864:_____/23:N0000004 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.euroturbo.eu/publications/proceedings-papers/ETC2023-144/" target="_blank" >https://www.euroturbo.eu/publications/proceedings-papers/ETC2023-144/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.29008/ETC2023-144" target="_blank" >10.29008/ETC2023-144</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Enhanced flutter test rig for a transonic flow in a linear turbine blade cascade and numerical data validation

Popis výsledku v původním jazyce

Modern efficient and robust steam turbines must be designed for large operating ranges and run at off-design conditions and high backpressures. Therefore, there is a danger that in some operating conditions, last-stage rotor blades can suffer from self-excited vibration (flutter), leading to severe failures of rotor blades or turbine units. In order to avoid this, the design of aerodynamically stable last stage rotor blades became a major topic for all steam turbine manufacturers and a validated numerical model for flutter prediction during the blade preliminary design phase is required. As flutter measurement is impossible in real turbines, controlled flutter tests on simplified experimental models must be used. However, experimental flutter testing facilities are rare. This paper reports on a flutter test rig enhancement to transonic flow and numerical data validation of aerodynamic stability in a linear turbine blade cascade. Aerodynamic forces and moments are estimated for different boundary conditions at pure bending, pure torsion and combined modes. The results are compared to numerical simulations performed using commercial code ANSYS CFX. Good agreement between the experiment and the numerical simulations proved a successful validation of the numerical tool.

Název v anglickém jazyce

Enhanced flutter test rig for a transonic flow in a linear turbine blade cascade and numerical data validation

Popis výsledku anglicky

Modern efficient and robust steam turbines must be designed for large operating ranges and run at off-design conditions and high backpressures. Therefore, there is a danger that in some operating conditions, last-stage rotor blades can suffer from self-excited vibration (flutter), leading to severe failures of rotor blades or turbine units. In order to avoid this, the design of aerodynamically stable last stage rotor blades became a major topic for all steam turbine manufacturers and a validated numerical model for flutter prediction during the blade preliminary design phase is required. As flutter measurement is impossible in real turbines, controlled flutter tests on simplified experimental models must be used. However, experimental flutter testing facilities are rare. This paper reports on a flutter test rig enhancement to transonic flow and numerical data validation of aerodynamic stability in a linear turbine blade cascade. Aerodynamic forces and moments are estimated for different boundary conditions at pure bending, pure torsion and combined modes. The results are compared to numerical simulations performed using commercial code ANSYS CFX. Good agreement between the experiment and the numerical simulations proved a successful validation of the numerical tool.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/TN02000025" target="_blank" >TN02000025: Národní centrum pro energetiku II</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

15th European Conference on Turbomachinery Fluid dynamics & Thermodynamics

ISBN

—

ISSN

2410-4833

e-ISSN

—

Počet stran výsledku

7

Strana od-do

—

Název nakladatele

Euroturbo

Místo vydání

—

Místo konání akce

Budapest, Hungary

Datum konání akce

24. 4. 2023

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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