TY - JOUR

T1 - Influence of a Central Jet on Isothermal and Reacting Swirling Flow in a Model Combustion Chamber

AU - Palkin, Egor V.

AU - Hrebtov, Mikhail Yu

AU - Slastnaya, Darya A.

AU - Mullyadzhanov, Rustam I.

AU - Vervisch, Luc

AU - Sharaborin, Dmitriy K.

AU - Lobasov, Aleksei S.

AU - Dulin, Vladimir M.

N1 - Funding Information: Funding: The study was supported by the Ministry of Science and Higher Education of the Russian Federation (agreement No. 075-15-2020-806). Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/3/1

Y1 - 2022/3/1

N2 - We studied flow dynamics in a model combustion chamber using Large-eddy simulations (LES) and Particle image velocimetry (PIV) at the Reynolds number Re of 15,000. The swirl is produced using a Turbomeca swirler and air flow, while combustion is supported by a central methane/air jet. We compared four flow regimes, assessing the effect of the central jet for isothermal and lean reacting conditions. A detailed comparison for isothermal and reactive cases without the central jet is described, validating the LES results against PIV. We observe that unsteady dynamics are governed by global instability in the form of a well-known precessing vortex core (PVC). The central jet slightly changes the dynamics of PVC in the isothermal case where a strong recirculation zone is still formed. However, for the reacting case, the bubble is completely destroyed with no signs of strong vortical structures in the inner shear layer. These observations are confirmed using spectral analysis and proper orthogonal decomposition, describing the contribution of different flow modes in terms of azimuthal harmonics.

AB - We studied flow dynamics in a model combustion chamber using Large-eddy simulations (LES) and Particle image velocimetry (PIV) at the Reynolds number Re of 15,000. The swirl is produced using a Turbomeca swirler and air flow, while combustion is supported by a central methane/air jet. We compared four flow regimes, assessing the effect of the central jet for isothermal and lean reacting conditions. A detailed comparison for isothermal and reactive cases without the central jet is described, validating the LES results against PIV. We observe that unsteady dynamics are governed by global instability in the form of a well-known precessing vortex core (PVC). The central jet slightly changes the dynamics of PVC in the isothermal case where a strong recirculation zone is still formed. However, for the reacting case, the bubble is completely destroyed with no signs of strong vortical structures in the inner shear layer. These observations are confirmed using spectral analysis and proper orthogonal decomposition, describing the contribution of different flow modes in terms of azimuthal harmonics.

KW - Combustion chamber

KW - Large-eddy simulation

KW - Particle image velocimetry

KW - Precessing vortex core

KW - Swirling flow

UR - http://www.scopus.com/inward/record.url?scp=85125186948&partnerID=8YFLogxK

U2 - 10.3390/en15051615

DO - 10.3390/en15051615

M3 - Article

AN - SCOPUS:85125186948

VL - 15

JO - Energies

JF - Energies

SN - 1996-1073

IS - 5

M1 - 1615

ER -