Investigation on the hydrodynamic damping using prescribed blade motion techniques

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F19%3APU134727" target="_blank" >RIV/00216305:26210/19:PU134727 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1755-1315/405/1/012017" target="_blank" >http://dx.doi.org/10.1088/1755-1315/405/1/012017</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1755-1315/405/1/012017" target="_blank" >10.1088/1755-1315/405/1/012017</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Investigation on the hydrodynamic damping using prescribed blade motion techniques

Popis výsledku v původním jazyce

Increasing requirements for a high efficiency in a wide operating range of hydraulic turbines lead to turbine designs being more susceptible for periodic and stochastic excitation forces. For periodic excitations like rotor-stator interaction, a large distance to runner natural frequencies is not always possible. And stochastic excitation may cause the runner to respond directly with one of its natural frequencies. Therefore, in both cases, the quantification of damping for runner mode shapes is necessary to predict dynamic stresses and to ensure the required lifetime. The main goal of this paper is to present numerical investigations of the hydrodynamic damping using unsteady CFD analyses with prescribed structural motion. The investigation is carried out on a simple hydrofoil, which is placed in a the cavitation tunnel test section. The natural vibration shape of the hydrofoil is prescribed as a periodic motion with the corresponding frequency. As a prerequisite, natural frequency and mode shape have to include the effects of water environment. Two different approaches (in time and frequency domain) have been applied and compared to 2-way fluid-structure-interaction analysis with respect to accuracy and calculation time. In addition numerical results are validated by compa

Název v anglickém jazyce

Investigation on the hydrodynamic damping using prescribed blade motion techniques

Popis výsledku anglicky

Increasing requirements for a high efficiency in a wide operating range of hydraulic turbines lead to turbine designs being more susceptible for periodic and stochastic excitation forces. For periodic excitations like rotor-stator interaction, a large distance to runner natural frequencies is not always possible. And stochastic excitation may cause the runner to respond directly with one of its natural frequencies. Therefore, in both cases, the quantification of damping for runner mode shapes is necessary to predict dynamic stresses and to ensure the required lifetime. The main goal of this paper is to present numerical investigations of the hydrodynamic damping using unsteady CFD analyses with prescribed structural motion. The investigation is carried out on a simple hydrofoil, which is placed in a the cavitation tunnel test section. The natural vibration shape of the hydrofoil is prescribed as a periodic motion with the corresponding frequency. As a prerequisite, natural frequency and mode shape have to include the effects of water environment. Two different approaches (in time and frequency domain) have been applied and compared to 2-way fluid-structure-interaction analysis with respect to accuracy and calculation time. In addition numerical results are validated by compa

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/EF16_026%2F0008392" target="_blank" >EF16_026/0008392: Výpočtové simulace pro efektivní nízkoemisní energetiku</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

IOP Conference Series: Earth and Environmental Science

ISBN

—

ISSN

1755-1315

e-ISSN

—

Počet stran výsledku

6

Strana od-do

1-6

Název nakladatele

Neuveden

Místo vydání

neuveden

Místo konání akce

Stuttgart

Datum konání akce

9. 10. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000562376700017