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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v19.i10.30
pages 929-955

EXPERIMENTAL AND NUMERICAL ANALYSIS OF SPRAY DISPERSION AND EVAPORATION IN A COMBUSTION CHAMBER

Mouldi Chrigui
Chair of Energy and Powerplant Technology, Department of Mechanical Engineering, Darmstadt University of Technology Petersenstr. 30, 64287 Darmstadt, Germany
Amsini Sadiki
Institute of Energy and Power Plant Technology, Technische Universität Darmstadt, 64287 Darmstadt, Germany
Johannes Janicka
Institute of Energy and Power Plant Technology, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany; Darmstadt Graduate School of Excellence Energy Science and Engineering, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany
M. Hage
Institute for Reactive Flows and Diagnostics, Center of Smart Interface Department of Mechanical Engineering, TU Darmstadt, Petersenstrasse 32, 64287 Darmstadt
Andreas Dreizler
Institute for Reactive Flows and Diagnostics, Center of Smart Interface Department of Mechanical Engineering, TU Darmstadt, Petersenstrasse 32, 64287 Darmstadt

SINOPSIS

This work investigates a set of two-phase flow submodels to propose a reliable complete numerical model that is able to predict flow and evaporating droplet properties under industrial gas turbine conditions. For these purposes, a confined complex spray configuration was studied experimentally and numerically. Measurements of the gas phase were conducted using the laser Doppler anemometry (LDA) technique. The nozzle was operated in a modular combustor at elevated pressure and temperature conditions. For the dispersed phase, a nonreacting phase (water) was chosen to prevent chemical reactions. The focus of the investigation was on spray propagation and evaporation. Droplet velocity components and droplet diameters were measured using phase Doppler anemometry (PDA). Radial profiles were taken along two axes, recording the axial and radial velocity components as well as the probability density functions of the diameter distributions. Numerical simulations were performed within the framework of a Reynolds-averaged NavierStokes (RANS)-based Eulerian−Lagrangian approach to appraise the prediction techniques used. Under the framework of two-way coupling, the dispersed phase effects on the momentum, turbulence quantities, energy, and mass were accounted for by adding appropriate source terms to each transport equation of the gas phase. A significantly large droplet number was used to ensure reliable statistical averaging so that the dispersed phase properties do not depend on the parcel number within the control volume. Comparisons between the numerical and experimental results showed acceptable agreement for the droplet velocities, axial mass flux, and Sauter mean diameter, but some disagreements were observed for the fluctuations and the apex angle of the spray.


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NUMERICAL STUDY OF THE EFFECTS OF GAS TEMPERATURE FLUCTUATION ON A TURBULENT EVAPORATING SPRAY
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