A Numerical Study of the Relation Between the Acoustic Generator Geometry and the Heat Transfer Conditions

• Autorzy: Rulik S. , Wróblewski W. , Rusin K.

Identyfikatory

DOI

10.24425/119407

• Języki publikacji: EN

Abstrakty

EN

Modern gas turbine systems operate in temperatures ranging from 1200°C to even 1500°C, which creates bigger problems related to the blade material thermal strength. In order to ensure appropriate protection of the turbine blades, a sophisticated cooling system is used. Current emphasis is placed on the application of non-stationary flow effects to improve cooling conditions, e.g., the unsteady-jet heat transfer or the heat transfer enhancement using high-amplitude oscillatory motion. The presented research follows a similar direction. A new concept is proposed of intensification of the heat transfer in the cooling channels with the use of an acoustic wave generator. The acoustic wave is generated by an appropriately shaped fixed cavity or group of cavities. The phenomenon is related to the coupling mechanism between the vortex shedding generated at the leading edge and the acoustic waves generated within the cavity area. Strong instabilities can be observed within a certain range of the free flow velocities. The presented study includes determination of the relationship between the amplitude of acoustic oscillations and the cooling conditions within the cavity. Different geometries of the acoustic generator are investigated. Calculations are also performed for variable flow conditions. The research presented in this paper is based on a numerical model prepared using the Ansys CFX-17.0 commercial CFD code.

Słowa kluczowe

EN

cavity noise; cavity cooling; new cooling techniques; acoustic cooling; acoustic waves; heat transfer in cavities; thermoacoustics

PL

szum aerodynamiczny; chłodzenie zewnętrzne; nowe techniki chłodzenia; chłodzenie akustyczne; fale akustyczne; przepływ ciepła; termoakustyka

• Wydawca: Komitet Budowy Maszyn PAN
• Czasopismo: Archive of Mechanical Engineering
• Rocznik: 2018
• Tom: Vol. LXV, nr 1
• Strony: 5--26
• Opis fizyczny: Bibliogr. 22 poz., rys., tab.

Twórcy

autor

Rulik S.

• Institute of Power Engineering and Turbomachinery, Silesian University of Technology, 44-100 Gliwice, Konarskiego 18 Str.

autor

Wróblewski W.

• Institute of Power Engineering and Turbomachinery, Silesian University of Technology, 44-100 Gliwice, Konarskiego 18 Str.

autor

Rusin K.

• Institute of Power Engineering and Turbomachinery, Silesian University of Technology, 44-100 Gliwice, Konarskiego 18 Str.

Bibliografia

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Uwagi

EN

1. This work was performed using the PL-Grid infrastructure. The presented research was conducted within the 2015/17/B/ST8/02795 research project “Heat transfer intensification using an acoustic wave generator”, financed by the National Science Centre, Poland.

PL

2. Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).