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Communication Dans Un Congrès Année : 2021

Internal Numerical Simulation of a Swirl Simplex Atomizer to Predict Atomization Outputs

Résumé

Numerical simulation of injectors could help improving their designs. In particular, a two-phaseflow simulation of a swirl simplex atomizer allows computing the main characteristic parameterssuch as the spray cone angle, the fuel sheet thickness and the air core diameter. This workdescribes an attempt to go a step further to characterize atomization and spray characteristicswith the ultimate goal to predict the spray distribution in terms of size and velocity.A commercial injector has been used in the CORIA Rouen Spray Burner (CRSB) set up to studyturbulent spray combustion. This experiment has produced a well-documented database forthe last two TCS workshops (see TCS 6 and 7 at http://www.tcs-workshop.org/). Even thoughspray measurements are used to define the fuel injection in combustion numerical simulations,the spray injection characteristics remain the main cause of uncertainties. The present workaims at answering this question: Is it possible to complete our knowledge of spray injection bynumerical simulation of the full atomization process?The first challenge is to measure the inner geometry. Standards techniques such as X-raytomography and microscopy have been applied. In order to accurately reproduce the internalthroat and swirl chamber, additional measurements have been performed by silicon molding,leading to the definition of a nominal geometry that can be used for further CFD simulation.The second challenge is to produce a mesh regular enough to be compatible with the interfacecapturing method. Several mesh strategies have been tested starting from the swirl chamberwith very thin mesh layers to capture the liquid film at the injector wall and to describe theexternal liquid sheet. Then, a third challenge concerns the numerical simulation itself, sinceit must handle the multi-scale nature of such flows until the formation of the spray. A non-reactive condition has been tested with the interFoam solver (OpenFOAM library) in a LargeEddy Simulation (LES) framework.Eventually, the last challenge is to build an analysis to connect the numerical simulation that islimited to the close vicinity of the injector and the experimental measurements that are rejectedfarther downstream on the dispersed spray. This last step is based on the analysis of thesurface curvature distribution that is described with more detail on another presentation at thisICLASS conference.

Dates et versions

hal-03457327 , version 1 (30-11-2021)

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Citer

Diego Ferrando, Mario Belmar-Gil, Lorenzo Palanti, Marcos Carreres, David Cervelló-Sanz, et al.. Internal Numerical Simulation of a Swirl Simplex Atomizer to Predict Atomization Outputs. International Conference of Liquid Atomization and Spray Systems, Sep 2021, Edinburgh, United Kingdom. ⟨10.2218/iclass.2021.5890⟩. ⟨hal-03457327⟩
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