Abstract
While the first part of this work dealt with the question related to the impact of partial vaporization on spray flame properties, the second part attempts to answer the question how the evaporation process behaves under turbulent premixed combustion conditions. According to the Eulerian-Lagrangian RANS-based spray module designed in Part I the non-equilibrium evaporation model, that was proven to capture accurately the evaporation process characteristics under operating environments similar to industrial application conditions, is especially applied here. The so-called conditioned progress variable approach (CPVA) based on the Bray-Moss-Libby (BML) model as adapted in Part I to account for both premixed and partially premixed combustion is used to describe the combustion process and determine the gas properties that are seen by droplets. To assess the numerical approach and to analyze the evaporation-combustion interactions a model gas turbine combustor fueled by N-heptane is considered as to exhibit the behaviour of single component fuel. It features a turbulent premixed combustion. To isolate the impact of high combustion temperature on spray evaporation, two cases were investigated and compared. In the first case the spray evaporation is studied in a non-combusting environment. In the second it is investigated how the premixed combustion conditions affect droplet spray characteristics.
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The authors acknowledge the financial support from the German Research Council (DFG) through the SFB568 and GRK1144.
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Sadiki, A., Ahmadi, W., Chrigui, M. (2011). Toward the Impact of Fuel Evaporation-Combustion Interaction on Spray Combustion in Gas Turbine Combustion Chambers. Part II: Influence of High Combustion Temperature on Spray Droplet Evaporation. In: Merci, B., Roekaerts, D., Sadiki, A. (eds) Experiments and Numerical Simulations of Diluted Spray Turbulent Combustion. ERCOFTAC Series, vol 17. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1409-0_4
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