Large eddy simulations for radiation-spray coupling for a lean direct injector combustor Public Deposited

http://ir.library.oregonstate.edu/concern/articles/g158bk20w

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article is copyrighted by the Combustion Institute and published by Elsevier. It can be found at:  http://www.journals.elsevier.com/combustion-and-flame/.

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  • Large Eddy Simulations (LESs) for a lean-direct injection (LDI) combustor are performed and compared with experimental data. The LDI emissions characteristics, and radiation-spray coupling effect on the predictions are analyzed. The flamelet progress variable approach is employed for chemistry tabulation coupled with a stochastic secondary breakup model. Good comparisons are shown with the experimental data mean and root mean square for both the gas phase and spray droplets profiles. The effect of combustion is found to change the shape and structure of the central recirculation zone to be more compact in length but larger in diameter in the transverse direction. In-addition the results show that the gas phase radiation alters the spray dynamics by changing the local gas-phase temperature distribution. This impacts the spray evaporation rate, the local mixture fraction, and consequently the combustion heat released rate and the predicted emissions. The simulation with no radiation modeling shows over prediction in the temperature distribution, pollutants emissions, higher fuel evaporation rate, and narrower range of droplet size distribution with lower number density for the smaller size particles. The current study suggests that, even for low pressure systems, radiation modeling can be important for accurate emissions prediction.
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  • El-Asrag, H. A., Iannetti, A. C., & Apte, S. V. (2014). Large eddy simulations for radiation-spray coupling for a lean direct injector combustor. Combustion and Flame, 161(2), 510-524. doi:10.1016/j.combustflame.2013.09.020
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  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-04-21T16:07:35Z (GMT) No. of bitstreams: 2 ApteSourabhMechanicalIndustrialManufacturingEngineeringLargeEddySimulations.pdf: 4190737 bytes, checksum: 32e5ad91b6f5220deeccd3b5ffa321cb (MD5) ApteSourabhMechanicalIndustrialManufacturingEngineeringLargeEddySimulations_SupplementaryVideo.mp4: 5118432 bytes, checksum: 72bc2417d699f3d4c8d989d92a10b7aa (MD5)
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