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Regimes of Lean Premixed Combustion of Gas Fuel in a Radial Burner

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Combustion, Explosion, and Shock Waves Aims and scope

Abstract

This paper presents the results of an experimental study of the characteristics of a swirling flow with the formation of vortex structures in a radial burner under isothermal and reacting conditions for various flow swirling parameters. For isothermal conditions, the distributions of average and fluctuating velocity fields are obtained, including those related to a precessing vortex phase. Moreover, pressure fluctuations induced by the precessing vortex are analyzed and the contribution of the precessing vortex structure to the overall level of turbulence is determined. The studies are carried out using modern non-intrusive experimental methods of flow diagnostics, such as optical imaging and particle image velocimetry (PIV). An acoustic field generated by vortex core precession (VCP) is recorded using four measuring microphones with pressure taps. The contribution of VCP to the overall level of turbulence is revealed using the method of proper orthogonal decomposition (POD), also applied to analyze the velocity distributions obtained by the PIV method. The experiments show that, in the isothermal case, the VCP that occurs after the swirl parameter overcomes a value \(S= 0.6\) is a single-helix vortex structure whose contribution to the overall level of kinetic turbulence energy reaches up to 27%. For reacting conditions, the flame is visualized at different levels of flow swirling and the frequency characteristics of the VCP occurring in the flow at \(S \ge 0.6\) are measured. It is shown that the dependence of the dimensionless frequency of the VCP as a function of the flow swirl \(S\) has the same nonmonotonic character both in the case of combustion and in the isothermal case.

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Authors and Affiliations

  1. Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    E. Yu. Gorelikov, I. V. Litvinov & S. I. Shtork

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  1. E. Yu. Gorelikov
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  2. I. V. Litvinov
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  3. S. I. Shtork
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Correspondence to E. Yu. Gorelikov, I. V. Litvinov or S. I. Shtork.

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Translated from Fizika Goreniya i Vzryva, 2022, Vol. 58, No. 5, pp. 18-27.https://doi.org/10.15372/FGV20220503.

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Gorelikov, E.Y., Litvinov, I.V. & Shtork, S.I. Regimes of Lean Premixed Combustion of Gas Fuel in a Radial Burner. Combust Explos Shock Waves 58, 521–530 (2022). https://doi.org/10.1134/S0010508222050033

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