Generation of pressure oscillations in air flows in vertical channels with internal heat release

• Autorzy: Basok Boris , Davydenko Boris , Pavlenko Anatoliy

Identyfikatory

DOI

10.53412/jntes-2021-3-3

• Języki publikacji: EN

Abstrakty

EN

The characteristics of the air flow in a vertical channel, arising due to local internal heat release, are investigated by the method of numerical simulation. Heat is supplied to the flow from internal sources located in a limited volume closer to the inlet section of the channel. The problem of flow and heat transfer is described by a system of unsteady Navier-Stokes and energy equations for a compressible medium. The coefficients of viscosity and thermal conductivity are considered to be temperature dependent. From the numerical solution of this system, the velocity, pressure, and temperature fields in the channel are determined. Based on the results of the calculations, the regularities of the change in time of velocity and pressure in the channel are determined. From the analysis of the results it follows that from the moment the heat supply begins, a vertical air flow develops in the channel, which is accompanied by oscillations in velocity and pressure. Self-oscillations arising in a gas flow are a manifestation of instability of flow. It is shown that stable oscillations take place in the presence of additional local hydraulic resistance in the channel. The dependence of the amplitude and frequency of pressure oscillations and the air flow velocity on the power of the sources of internal heat release and the height of the channel has been investigated. It was determined that with an increase in the power of the source of internal heat supply and the height of the channel, the amplitudes of the velocity and pressure fluctuations increase.

Słowa kluczowe

EN

natural convection; numerical modelling; flow instability; pressure self-oscillations; oscillation amplitude

• Wydawca: Kielce University of Technology
• Czasopismo: Journal of New Technologies in Environmental Science
• Rocznik: 2021
• Tom: Vol. 5, nr 3
• Strony: 106--116
• Opis fizyczny: Bibliogr. 15 poz., rys., wykr., wzory

Twórcy

autor

Basok Boris

• Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine

autor

Davydenko Boris

• Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine

autor

Pavlenko Anatoliy

• Kielce University of Technology, Poland

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).