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ISSN オンライン: 2642-0554

REYNOLDS NUMBER EFFECTS ON STATISTICS AND STRUCTURE OF AN ISOTHERMAL REACTING TURBULENT WALL-JET

Zeinab Pouransari
Linne FLOW Centre, Dept. of Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

Arne V. Johansson
Linne FLOW Centre, Dept. of Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

要約

In this study, three-dimensional direct numerical simulation (DNS) is used to investigate a reacting turbulent wall-jet. The flow is compressible and a single-step global reaction is considered. At the inlet, fuel and oxidizer enter the domain separately in a non-premixed manner. Two different simulations with different Reynolds numbers, Re = 2000 and Re = 6000 in terms of the inlet quantities are considered. The DNS-database of Pouransari et al. (2011) with the lower Reynolds number is used here for comparison and a new DNS is performed, in which the bulk Reynolds number is increased by a factor of three. This results in a comparable increase in the friction Reynolds number, which allows the study of Reynolds number effects. The main objective of this study is to compare the influences of changing the Reynolds number of the flow with the heat-release effects caused by the chemical reaction, that we studied earlier in Pouransari et al. (2013). Results primarily show that, the Reynolds number effects can clearly be observed both in turbulent structures and in the flame characteristics. While, both turbulent and flame structures become finer at the higher Reynolds number, the effect of decreasing the Reynolds number and adding the combustion heat release are not always the same.