TY - JOUR

T1 - LES Simulation of a Model Gas-Turbine Lean Combustor: Impact of Coherent Flow Structures on the Temperature Field and Concentration of CO and NO

AU - Chikishev, Leonid M.

AU - Sharaborin, Dmitriy K.

AU - Lobasov, Aleksei S.

AU - Dekterev, Artem A.

AU - Tolstoguzov, Roman V.

AU - Dulin, Vladimir M.

AU - Markovich, Dmitriy M.

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

PY - 2022/6/1

Y1 - 2022/6/1

N2 - The present paper reports on the numerical simulation of flow dynamics in a model gas-turbine combustor by large eddy simulation in order to evaluate the effect of coherent flow structures on the local fluctuations of gas temperature and local concentrations of NO and CO. The simulations were performed for a generic swirler, based on the design by Turbomeca, for a Reynolds number of 15,000 at normal and elevated inlet temperature and pressure (up to 500 K and 3.4 atm). The simulation data were validated based on the velocity measurements by stereoscopic particle image velocimetry. In order to reveal coherent flow structures, the velocity snapshots were processed by the proper orthogonal method. The temporal coefficients of the decomposition were used to evaluate the conditional sampled spatial distributions of the temperature and species concentration. It is shown that the coherent fluctuations of temperature can locally reach up to 200 K with the fluctuations of NO up to 20%. Thus, the results demonstrate that coherent flow structures in a lean swirl combustor can sufficiently contribute to NOx emission.

AB - The present paper reports on the numerical simulation of flow dynamics in a model gas-turbine combustor by large eddy simulation in order to evaluate the effect of coherent flow structures on the local fluctuations of gas temperature and local concentrations of NO and CO. The simulations were performed for a generic swirler, based on the design by Turbomeca, for a Reynolds number of 15,000 at normal and elevated inlet temperature and pressure (up to 500 K and 3.4 atm). The simulation data were validated based on the velocity measurements by stereoscopic particle image velocimetry. In order to reveal coherent flow structures, the velocity snapshots were processed by the proper orthogonal method. The temporal coefficients of the decomposition were used to evaluate the conditional sampled spatial distributions of the temperature and species concentration. It is shown that the coherent fluctuations of temperature can locally reach up to 200 K with the fluctuations of NO up to 20%. Thus, the results demonstrate that coherent flow structures in a lean swirl combustor can sufficiently contribute to NOx emission.

KW - elevated pressure

KW - gas-turbine combustor

KW - large eddy simulation

KW - lean methane flame

KW - NOx emission

KW - particle image velocimetry

KW - proper orthogonal decomposition

UR - http://www.scopus.com/inward/record.url?scp=85132722425&partnerID=8YFLogxK

U2 - 10.3390/en15124362

DO - 10.3390/en15124362

M3 - Article

AN - SCOPUS:85132722425

VL - 15

JO - Energies

JF - Energies

SN - 1996-1073

IS - 12

M1 - 4362

ER -