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Article

Direct numerical simulation of reacting turbulent wall-jets including heat-release

Authors: Pouransari, Z., Johansson, A.V.J.
Document Type: Conference
Pubstate: Published
Journal: Proc. Highly Resolved Turbulent Combustion, CORIA, Rouen, France
Volume:    1-7
Year: 2011

Abstract

In the present investigation, three-dimensional direct numerical simulation (DNS) is used to study a binary irreversible exothermic global reaction in a plane turbulent wall-jet. The flow is compressible and the chemical reaction is modeled by a single-step reaction with Arrhenius-type reaction rate, between oxidizer and fuel species. A constant coflow velocity is applied above the jet, with a temperature equal to that of the wall and a temperature dependent viscosity according to Sutherland’s law is used. At the inlet, fuel and oxidizer enter the domain separately in a non-premixed manner. The inlet Reynolds and Mach numbers are the same in all simulation cases. Primarily, it is observed that heat release effects delay the transition, enlarge the fluctuation intensities of density and pressure and also enhance the fluctuation level of the species concentrations. However, it has a damping effect on the turbulent kinetic energy. The growth rate of the turbulent wall-jet is influenced by the reaction through temperature-induced changes and density variations.