Experimental and numerical investigation of isothermal flow in an idealized swirl combustor
| Autor: | M.P. Escudier, A.K. Nickson, A. Nahavandi, Franz Joos, Ali Cemal Benim, K.J. Syed |
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| Rok vydání: | 2010 |
| Předmět: |
Physics
Turbulence Applied Mathematics Mechanical Engineering Isothermal flow Direct numerical simulation Reynolds number Reynolds stress equation model Mechanics Computer Science Applications symbols.namesake Classical mechanics Mechanics of Materials Reynolds decomposition symbols Reynolds-averaged Navier–Stokes equations Large eddy simulation |
| Zdroj: | International Journal of Numerical Methods for Heat & Fluid Flow. 20:348-370 |
| ISSN: | 0961-5539 |
| DOI: | 10.1108/09615531011024084 |
| Popis: | PurposeThe main purpose of the paper is the validation of different modelling strategies for turbulent swirling flow of an incompressible fluid in an idealized swirl combustor.Design/methodology/approachExperiments have been performed and computations carried out for a water test rig, for a Reynolds number of 4,600 based on combustor inlet mean axial velocity and diameter. Two cases have been investigated, one low swirl and the other high swirl intensity. Measurements of time‐averaged velocity components and corresponding rms turbulence intensities were measured using laser Doppler anemometer, along radial traverses at different axial locations. In the three‐dimensional, unsteady computations, large eddy simulation (LES) and URANS (Unsteady Reynolds Averaged Navier‐Stokes Equations or Reynolds Averaged Numerical Simulations) RSMs (Reynolds‐stress models) are basically employed as modelling strategies for turbulence. To model subgrid‐scale turbulence for LES, the models due to Smagorinsky and Voke are used. No‐model LES and coarse‐grid direct numerical simulation computations are also performed for one of the cases.FindingsThe predictions are compared with the measurements and reveal that LES provided the best overall accuracy for all of the cases, whereas no significant difference between the Smagorinsky and Voke models are observed for the time‐averaged velocity components.Originality/valueThis paper provides additional valuable information on the performance of various modelling strategies for turbulent swirling flows. |
| Databáze: | OpenAIRE |
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