Transverse injection of a plane-reacting jet into compressible turbulent channel flow

Abstract

A semi-implicit large-eddy simulation technique is used to predict transport and infinitely fast reaction processes of an / jet injected through a narrow spanwise slot into a subsonic turbulent air flow between isothermal channel walls. The large-eddy simulation (LES) technique is based on approximate deconvolution and explicit modelling of the filtered heat release term. Spatial derivatives are computed using sixth-order accurate central compact schemes. An explicit fourth-order Runge–Kutta algorithm serves for time-integration. Turbulent inflow conditions are generated by a separate LES of fully developed channel flow and are introduced well upstream of the injection station using characteristic boundary conditions. The complex transport processes in the vicinity of the injection region are highlighted by instantaneous and statistically averaged flow quantities by Reynolds stress and total enthalpy balances.

Keywords:

• compressible turbulence
• large-eddy simulation
• reacting turbulent flow
• turbulent heat and mass transfer
• turbulent mixing

Acknowledgments

[Acknowledgements] The work has been supported by the German Research Association (DFG) within the framework of the research group GRK 1095/1 on “Aero-thermodynamic design of a scramjet propulsion system for future space transportation.” Numerical simulations have been carried out using the high-performance computing system HLRB II (SGI Altix 4700) of Leibniz Rechenzentrum of the Bavarian Academy of Sciences at Garching, Germany.