Izvestiya of Saratov University.

Physics

ISSN 1817-3020 (Print)
ISSN 2542-193X (Online)


For citation:

Vorotnikov G. V., Zinovyev E. A., Nekrasova S. O. Gas oscillations in an annular channel induced by a longitudinal temperature gradient. Izvestiya of Saratov University. Physics , 2022, vol. 22, iss. 2, pp. 111-122. DOI: 10.18500/1817-3020-2022-22-2-111-122, EDN: SYWGFS

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
Published online: 
30.06.2022
Full text:
(downloads: 238)
Language: 
Russian
Article type: 
Article
UDC: 
534-13
EDN: 
SYWGFS

Gas oscillations in an annular channel induced by a longitudinal temperature gradient

Autors: 
Vorotnikov Gennady Viktorovich, Samara National Research University named after Academician S. P. Korolev
Zinovyev Evgeniy Aleksandrovich, Samara National Research University named after Academician S. P. Korolev
Nekrasova Svetlana Olegovna, Samara National Research University named after Academician S. P. Korolev
Abstract: 

Background and Objectives: When selecting the design and layout scheme of the thermoacoustic converter, special requirements include the placement of heat exchangers in the areas of heat input and output. The most promising in this regard are coaxial schemes with coaxial location (tube in tube) of the acoustic pathway channels. Such design features pose their own optimization problems. To solve them, it is necessary to reveal the peculiarities of changing the dynamical parameters of oscillating gas under acoustic wave conditions. Materials and Methods: In this paper we derive a second-order linear differential equation for pressure oscillations in the annular section channel in the presence of a constant longitudinal temperature gradient based on linearized equations of compressible medium mechanics, which does not depend on other dynamical parameters. The solutions are expressed in terms of two dimensionless parameters hµ ; h and δµ represent, respectively, half the distance between two concentric channels and a characteristic length using the dynamical viscosity of the gas and the angular frequency of acoustic oscillations. Results: The solution of the equation makes it possible to present expressions for the dynamical parameters of gas oscillations, such as velocity, density, temperature, as functions of the dynamical pressure. Conclusion: It has been shown that the derived equation is a more general case of the Rott equation obtained for a circular section channel under the same conditions. The dynamical parameter equations derived in this paper are applied to measurements of the acoustic power distribution in a thermoacoustic transducer and make it possible to simulate linear acoustic processes in coaxial channels of thermoacoustic devices.

Acknowledgments: 
The results of the work were obtained using the equipment of the Center of collective use “Intercafedral Scientific and Research Center of CAM-TECHNOLOGIES” with the financial support of the Ministry of Science and Higher Education of the Russian Federation (Project No. FSSS-2020-0019).
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Received: 
21.02.2022
Accepted: 
23.04.2022
Published: 
30.06.2022